Cisco ASA 5550 Series Getting Started Manual

Cisco ASA 5550
Getting Started Guide

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Cisco ASA 5550 Getting Started Guide

© 2006 Cisco Systems, Inc. All rights reserved.

CONTENTS

CHAPTER

CHAPTER

CHAPTER

1 Before You Begin 1-1

2 Maximizing Throughput on the ASA 5550 Adaptive Security Appliance 2-1

Embedded Network Interfaces 2-1

Balancing Traffic to Maximize Throughput 2-2

What to Do Next 2-5

3 Installing the Cisco ASA 5550 Security Appliance 3-1

Verifying the Package Contents 3-2

Installing the Chassis 3-3

Rack-Mounting the Chassis 3-4

Installing SFP Modules 3-5

SFP Module 3-6
Installing an SFP Module 3-7

Ports and LEDs 3-9

Front Panel LEDs 3-9
Rear Panel LEDs and Ports in Slot 0 3-10
Ports and LEDs in Slot 1 3-12

CHAPTER

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What to Do Next 3-13

4 Connecting Cables to Network Interfaces 4-1

Connecting Interface Cables 4-1

What to Do Next 4-7

Cisco ASA 5550 Getting Started Guide

iii

Contents

CHAPTER

CHAPTER

5 Configuring the Adaptive Security Appliance 5-1

About the Factory-Default Configuration 5-2

About the Adaptive Security Device Manager 5-2

Using the Startup Wizard 5-3

Before Launching the Startup Wizard 5-4
Running the Startup Wizard 5-4

Setting the Media Type for Fiber Interfaces 5-6

What to Do Next 5-7

6 Scenario: DMZ Configuration 6-1

Example DMZ Network Topology 6-1

Configuring the Security Appliance for a DMZ Deployment 6-4

Configuration Requirements 6-5
Starting ASDM 6-6
Creating IP Pools for Network Address Translation 6-7
Configuring NAT for Inside Clients to Communicate with the DMZ Web

Server

6-12

Configuring NAT for Inside Clients to Communicate with Devices on the
Internet

6-15

Configuring an External Identity for the DMZ Web Server 6-16
Providing Public HTTP Access to the DMZ Web Server 6-18

CHAPTER

iv

What to Do Next 6-24

7 Scenario: Remote-Access VPN Configuration 7-1

Example IPsec Remote-Access VPN Network Topology 7-1

Implementing the IPsec Remote-Access VPN Scenario 7-2

Information to Have Available 7-3
Starting ASDM 7-4
Configuring the ASA 5550 for an IPsec Remote-Access VPN 7-5

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Selecting VPN Client Types 7-6
Specifying the VPN Tunnel Group Name and Authentication Method 7-7
Specifying a User Authentication Method 7-8
(Optional) Configuring User Accounts 7-10
Configuring Address Pools 7-11
Configuring Client Attributes 7-12
Configuring the IKE Policy 7-13
Configuring IPsec Encryption and Authentication Parameters 7-15
Specifying Address Translation Exception and Split Tunneling 7-16
Verifying the Remote-Access VPN Configuration 7-17

What to Do Next 7-18

Contents

CHAPTER

APPENDIX

8 Scenario: Site-to-Site VPN Configuration 8-1

Example Site-to-Site VPN Network Topology 8-1

Implementing the Site-to-Site Scenario 8-2

Information to Have Available 8-2
Configuring the Site-to-Site VPN 8-3

Starting ASDM 8-3
Configuring the Security Appliance at the Local Site 8-4
Providing Information About the Remote VPN Peer 8-6
Configuring the IKE Policy 8-7
Configuring IPsec Encryption and Authentication Parameters 8-9
Specifying Hosts and Networks 8-10
Viewing VPN Attributes and Completing the Wizard 8-11

Configuring the Other Side of the VPN Connection 8-13

What to Do Next 8-13

A Obtaining a DES License or a 3DES-AES License A-1

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CHA P T E R

1

Before You Begin

Use the following table to find the installation and configuration steps that are
required for your implementation of the adaptive security appliance.

To Do This ... See ...

Install the chassis Chapter 3, “Installing the Cisco ASA

5550 Security Appliance”

Connect cables to network interfaces Chapter 4, “Connecting Cables to

Network Interfaces”

Perform initial setup of the adaptive
security appliance

Configure the adaptive security
appliance for your implementation

Refine configuration

Configure optional and advanced
features

Chapter 5, “Configuring the Adaptive
Security Appliance”

Chapter 6, “Scenario: DMZ
Configuration”

Chapter 7, “Scenario: Remote-Access
VPN Configuration”

Chapter 8, “Scenario: Site-to-Site VPN
Configuration”

Cisco Security Appliance Command
Line Configuration Guide

Cisco Security Appliance Command
Reference

Cisco Security Appliance Logging
Configuration and System Log
Messages

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1-1

Chapter 1 Before You Begin

1-2

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Maximizing Throughput on the ASA 5550 Adaptive Security Appliance

The Cisco ASA 5550 Series Security Appliance is designed to deliver maximum
throughput when configured according to the guidelines described in this chapter.

This chapter includes the following sections:

• Embedded Network Interfaces, page 2-1

• Balancing Traffic to Maximize Throughput, page 2-2

• What to Do Next, page 2-5

Embedded Network Interfaces

CHA P T E R

2

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The adaptive security appliance has two internal buses providing copper Gigabit
Ethernet and fiber Gigabit Ethernet connectivity:

• Slot 0 (corresponding to Bus 0) has four embedded copper Gigabit Ethernet

ports

• Slot 1 (corresponding to Bus 1) has four embedded copper Gigabit Ethernet

ports and four embedded SFPs that support fiber Gigabit Ethernet
connectivity

Cisco ASA 5550 Getting Started Guide

2-1

Chapter 2 Maximizing Throughput on the ASA 5550 Adaptive Security Appliance

Balancing Traffic to Maximize Throughput

Note To establish fiber connectivity on the adaptive security appliance, you must order

and install SFP modules for each fiber port you want to use. For more information
on fiber ports and SFP modules, see the “Installing SFP Modules” section on

page 3-5.

Figure 2-1 shows the embedded ports on the FWSM.

Figure 2-1 Embedded Ports on the ASA 5550

Slot 1

LNK

SPD0123

PWR

STATUS

Ethernet Fiber

MGMT

USB2

USB1

Slot 0

LINK SPD2LINK SPD1LINK SPD

LINK SPD

3

Ethernet

CONSOLE

FLASH

STATUS

ACTIVE

VPN

FLASH

0

POWER

AUX

Note Although Slot 1 has four copper Ethernet ports and four fiber Ethernet ports, you

can use only four Slot 1 ports at a time. For example, you could use two Slot 1
copper ports and two fiber ports, but you cannot use fiber ports if you are already
using all four Slot 1 copper ports.

Balancing Traffic to Maximize Throughput

To maximize traffic throughput, configure the adaptive security appliance so that
traffic is distributed equally between the two buses in the device. To achieve this,
lay out the network so that all traffic flows through both Bus 0 (Slot 0) and Bus 1
(Slot 1), entering through one bus and exiting through the other.

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Chapter 2 Maximizing Throughput on the ASA 5550 Adaptive Security Appliance

Balancing Traffic to Maximize Throughput

In Figure 2-2 and Figure 2-3, network traffic is distributed so that all traffic flows
through both buses in the device, enabling the adaptive security appliance to
deliver maximum throughput.

Figure 2-2 Traffic Evenly Distributed for Maximum Throughput (Copper to Copper)

Maximum

Slot 1

throughput

Slot 0

LNK

Incoming and

outgoing traffic

MGMT

SPD0123

PWR

STATUS

USB2

USB1

LINK SPD2LINK SPD1LINK SPD

LINK SPD

3

0

POWER

STATUS

FLASH

ACTIVE

VPN

FLASH

Incoming and

outgoing traffic

CONSOLE

AUX

Figure 2-3 Traffic Evenly Distributed for Maximum Throughput (Copper to Fiber)

Maximum

Slot 1

LNK

SPD0123

PWR

STATUS

Incoming and

outgoing traffic

throughput

MGMT

USB2

USB1

Slot 0

LINK SPD2LINK SPD1LINK SPD

LINK SPD

3

0

Incoming and

outgoing traffic

POWER

STATUS

FLASH

ACTIVE

CONSOLE

AUX

VPN

FLASH

153104

153305

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2-3

Balancing Traffic to Maximize Throughput

Figure 2-4 illustrates several configurations that do not enable the adaptive

security appliance to deliver maximum throughput because network traffic flows
through only one bus on the device.

Figure 2-4 Configurations Not Enabling Maximum Throughput

Chapter 2 Maximizing Throughput on the ASA 5550 Adaptive Security Appliance

Slot 1

LNK

SPD0123

Slot 1

LNK

SPD0123

Slot 1

LNK

SPD0123

Incoming and

outgoing traffic

S
U
T

R

A

W

T

P

S

S
U
T

R

A

W

T

P

S

Incoming and

outgoing traffic

S
U
T

R

A

W

T

P

S

Slot 0

MGMT

USB2

USB1

LINK SPD2LINK SPD1LINK SPD

LINK SPD

3

Incoming and

outgoing traffic

Slot 0

MGMT

USB2

USB1

LINK SPD2LINK SPD1LINK SPD

LINK SPD

3

Slot 0

MGMT

USB2

USB1

LINK SPD2LINK SPD1LINK SPD

LINK SPD

3

CONSOLE

FLASH

0

0

0

VPN

ACTIVE

POWER

STATUS

FLASH

VPN

ACTIVE

POWER

STATUS

FLASH

VPN

ACTIVE

POWER

STATUS

AUX

FLASH

CONSOLE

AUX

FLASH

CONSOLE

AUX

FLASH

2-4

Slot 1

LNK

SPD0123

S
U
T

R

A

W

T

P

S

Incoming and outgoing traffic

Cisco ASA 5550 Getting Started Guide

Slot 0

MGMT

USB2

USB1

LINK SPD2LINK SPD1LINK SPD

LINK SPD

3

FLASH

0

VPN

ACTIVE

POWER

STATUS

CONSOLE

AUX

FLASH

153306

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Chapter 2 Maximizing Throughput on the ASA 5550 Adaptive Security Appliance

Note You can use the show traffic command to see the traffic throughput over each bus.

For more information about using the command, see the Cisco Security Appliance
Command Reference.

What to Do Next

Continue with Chapter 3, “Installing the Cisco ASA 5550 Security Appliance.”

What to Do Next

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What to Do Next

Chapter 2 Maximizing Throughput on the ASA 5550 Adaptive Security Appliance

2-6

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CHA P T E R

3

Installing the Cisco ASA 5550 Security Appliance

Warning

Caution Read the safety warnings in the Regulatory Compliance and Safety Information

Only trained and qualified personnel should be allowed to install, replace, or
service this equipment.

for the Cisco ASA 5500 Series and follow proper safety procedures when
performing these steps.

This chapter describes the ASA 5550 adaptive security appliance and rack-mount
and installation procedures for the adaptive security appliance. This chapter
includes the following sections:

• Verifying the Package Contents, page 3-2

• Installing the Chassis, page 3-3

• Installing SFP Modules, page 3-5

• Ports and LEDs, page 3-9

• What to Do Next, page 3-13

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3-1

Chapter 3 Installing the Cisco ASA 5550 Security Appliance

Verifying the Package Contents

Verifying the Package Contents

Verify the contents of the packing box, shown in Figure 3-1, to ensure that you
have received all items necessary to install the Cisco ASA 5550.

Figure 3-1 Contents of ASA 5550 Package

L
N

K

3

2

1

0

Cisco SSM-4GE

S

P

D

POWER

MGMT

USB2

STATUS

USB1

L

IN

K

S

P

D

L

IN

3

F

L

A
S

K

S

P

2

H

D

L

IN

K

S

P

D

L
IN

K

1

S

R

P

D

E

S

0

W

U

O

T

E

P

A

IV

T

N

T

H

S

P

S

C

V

A

A
L
F

Cisco ASA 5550 adaptive

security appliance

Mounting brackets

(700-18797-01 AO) right

(700-18798-01 AO) left

2 long cap screws

(48-0654-01 AO)

4 flathead screws

(48-0451-01 AO)

4 cap screws

(48-0523-01 AO)

4 rubber feet

Yellow Ethernet cable

(72-1482-01)

Blue console cable

PC terminal adapter

Cable holder

Cisco ASA

5550 Adaptive

Security Appliance

Product CD

Documentation

Safety and

Compliance

Guide

153215

3-2

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Chapter 3 Installing the Cisco ASA 5550 Security Appliance

Installing the Chassis

This section describes how to rack-mount and install the adaptive security
appliance. You can mount the adaptive security appliance in a 19-inch rack (with
a 17.5- or 17.75-inch opening).

Installing the Chassis

Warning

Warning

To prevent bodily injury when mounting or servicing this unit in a rack, you must
take special precautions to ensure that the system remains stable. The
following guidelines are provided to ensure your safety.

The following information can help plan equipment rack installation:

• Allow clearance around the rack for maintenance.

• When mounting a device in an enclosed rack ensure adequate ventilation. An

enclosed rack should never be overcrowded.

Make sure that the rack is not

congested, because each unit generates heat.

• When mounting a device in an open rack, make sure that the rack frame does

not block the intake or exhaust ports.

• If the rack contains only one unit, mount the unit at the bottom of the rack.

• If the rack is partially filled, load the rack from the bottom to the top, with the

heaviest component at the bottom of the rack.

• If the rack contains stabilizing devices, install the stabilizers prior to

mounting or servicing the unit in the rack.

Before performing any of the following procedures, ensure that the power
source is off. (AC or DC). To ensure that power is removed from the DC circuit,
locate the circuit breaker on the panel board that services the DC circuit,
switch the circuit breaker to the OFF position, and tape the switch handle of the
circuit breaker in the OFF position.

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3-3

Installing the Chassis

Rack-Mounting the Chassis

To rack-mount the chassis, perform the following steps:

Step 1 Attach the rack-mount brackets to the chassis using the supplied screws. Attach

the brackets to the holes as shown in Figure 3-2. After the brackets are secured to
the chassis, you can rack-mount it.

Figure 3-2 Installing the Right and Left Brackets

LNK

3

2

Chapter 3 Installing the Cisco ASA 5550 Security Appliance

1

153216

3-4

Step 2

Cisco ASA 5550 Getting Started Guide

Attach the chassis to the rack using the supplied screws, as shown in Figure 3-3.

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Chapter 3 Installing the Cisco ASA 5550 Security Appliance

Figure 3-3 Rack-Mounting the Chassis

Installing SFP Modules

C
IS

CO

A

S

A

POWER

STATUS

ACT

IVE

VP

554

A

0

d

a

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p

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tiv

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119633

To remove the chassis from the rack, remove the screws that attach the chassis to
the rack, and then remove the chassis.

Installing SFP Modules

The adaptive security appliance uses a field-replaceable SFP module to establish
fiber Gigabit Ethernet connections.

This section describes how to install and remove SFP modules in the adaptive
security appliance. This section includes the following topics:

• SFP Module, page 3-6

• Installing an SFP Module, page 3-7

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3-5

Installing SFP Modules

SFP Module

Note If you install an SFP module after the switch has powered on, you must reload the

Chapter 3 Installing the Cisco ASA 5550 Security Appliance

The SFP (Small Form-Factor Pluggable) module is a hot-swappable input/output
device that plugs into the fiber ports.

adaptive security appliance to enable the SFP module.

Table 3-1 lists the SFP modules that are supported by the adaptive security

appliance.

Table 3-1 Supported SFP Modules

SFP Module Type of Connection Cisco Part Number

1000BASE-LX/LH Fiber GLC-LH-SM=

1000BASE-SX Fiber GLC-SX-MM=

The 1000BASE-LX/LH and 1000BASE-SX SFP modules are used to establish
fiber connections. Use fiber cables with LC connectors to connect to an SFP
module. The SFP modules support 850 to 1550 nm nominal wavelengths. The
cables must not exceed the required cable length for reliable communications.

Table 3-2 lists the cable length requirements.

Table 3-2 Cabling Requirements for Fiber-Optic SFP Modules

SFP Module

62.5/125 micron
Multimode 850
nm Fiber

50/125 micron
Multimode 850
nm Fiber

62.5/125 micron
Multimode
1310 nm Fiber

— — 550 m at

LX/LH

SX

275 m at
200 Mhz-km

Cisco ASA 5550 Getting Started Guide

550 m at
500 Mhz-km

500 Mhz-km

———

3-6

50/125 micron
Multimode
1310 nm Fiber

550 m at
400 Mhz-km

9/125 micron
Single-mode
1310 nm Fiber

10 km

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Chapter 3 Installing the Cisco ASA 5550 Security Appliance

Use only Cisco-certified SFP modules on the adaptive security appliance. Each
SFP module has an internal serial EEPROM that is encoded with security
information. This encoding provides a way for Cisco to identify and validate that
the SFP module meets the requirements for the adaptive security appliance.

Note Only SFP modules certified by Cisco are supported on the adaptive security

appliance.

Caution Protect your SFP modules by inserting clean port plugs into the SFPs after the

cables are extracted from them. Be sure to clean the optic surfaces of the fiber
cables before you plug them back into the optical bores of another SFP module.
Avoid getting dust and other contaminants into the optical bores of your SFP
modules: The optics do not work correctly when obstructed with dust.

Installing SFP Modules

Warning

Because invisible laser radiation may be emitted from the aperture of the port
when no cable is connected, avoid exposure to laser radiation and do not stare
into open apertures.

Installing an SFP Module

To install an SFP module in a fiber port in Slot 1, perform the following steps:

Step 1 Line up the SFP module with the port and slide the SFP module into the port slot

until it locks into position as shown in Figure 3-4.

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Installing SFP Modules

Chapter 3 Installing the Cisco ASA 5550 Security Appliance

Figure 3-4 Installing an SFP Module

3

2

132985

1

1 Port plug 3 SFP module

2 Port slot

3-8

Caution Do not remove the port plugs from the SFP module until you are ready to connect

the cables.

Step 2 Remove the port plug; then connect the network cable to the SFP module.

Step 3 Connect the other end of the cable to your network. For more information on

connecting the cables, see Chapter 4, “Connecting Cables to Network Interfaces.”

Caution The latching mechanism used on many SFP modules locks them into place when

cables are connected. Do not pull on the cabling in an attempt to remove the SFP
module.

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Chapter 3 Installing the Cisco ASA 5550 Security Appliance

Ports and LEDs

This section describes the front and rear panels. Figure 3-5 shows the front panel
LEDs. This section includes the following topics:

• Front Panel LEDs, page 3-9

• Rear Panel LEDs and Ports in Slot 0, page 3-10

• Ports and LEDs in Slot 1, page 3-12

Front Panel LEDs

Figure 3-5 shows the LEDs on the front panel of the adaptive security appliance.

Figure 3-5 Front Panel LEDs

Ports and LEDs

POWER STATUS

1

2

ACTIVE

3

CISCO ASA 5540

VPN

FLASH

5

4

SERIES

Adaptive Security Appliance

119638

LED Color State Description

1 Power Green On The system has power.

2 Status Green Flashing The power-up diagnostics are running or the system is booting.

Solid The system has passed power-up diagnostics.

Amber Solid The power-up diagnostics have failed.

3 Active Green Flashing There is network activity.

4 VPN Green Solid VPN tunnel is established.

5 Flash Green Solid The CompactFlash is being accessed.

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Chapter 3 Installing the Cisco ASA 5550 Security Appliance

Ports and LEDs

Rear Panel LEDs and Ports in Slot 0

Figure 3-6 shows the rear panel LEDs and ports in Slot 0.

Figure 3-6 Rear Panel LEDs and Ports on Slot 0 (AC Power Supply Model Shown)

1

MGMT

LNK

SPD0123

PWR

1 Management Port

STATUS

1

USB2

USB1

6

LINK SPD2LINK SPD1LINK SPD

LINK SPD

3

0

7

6 USB 2.0 interfaces

2 External CompactFlash slot 7 Network interfaces

2

FLASH

ACTIVE

POWER

STATUS

8 10 12

11

9

2

3

3

CONSOLE

AUX

VPN

FLASH

13

11 VPN LED

12 Flash LED

4

5

153103

14

3 Serial Console port 8 Power indicator LED 13 AUX port

4 Power switch 9 Status indicator LED 14 Power connector

5 Power indicator LED 10 Active LED

1. The management 0/0 interface is a Fast Ethernet interface designed for management traffic only.

2. Reserved for future use.

3. GigabiteEthernet interfaces, from right to left, GigabitEthernet 0/0, GigabitEthernet 0/1, GigabitEthernet 0/2, and
GigabitEthernet 0/3.

3-10

For more information on the Management Port, see the management-only
command in the Cisco Security Appliance Command Reference.

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Chapter 3 Installing the Cisco ASA 5550 Security Appliance

Figure 3-7 shows the adaptive security appliance rear panel LEDs.

Figure 3-7 Rear Panel Link and Speed Indicator LEDs

21

MGMT

USB2

USB1

Ports and LEDs

LNK SPD

LNK SPD2LNK SPD1LNK SPD

3

0

126917

1 MGMT indicator LEDs 2 Network interface LEDs

Table 3-3 lists the rear MGMT and Network interface LEDs.

Table 3-3 Link and Speed LEDs

Indicator Color Description

Left side Solid green

Green flashing

Right side Not lit

Green

Amber

Physical link

Network activity

10 Mbps

100 Mbps

1000 Mbps

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3-11

Ports and LEDs

Ports and LEDs in Slot 1

Figure 3-8 illustrates the ports and LEDs in Slot 1.

Figure 3-8 Ports and LEDs in Slot 1

Chapter 3 Installing the Cisco ASA 5550 Security Appliance

8

7

153212

LNK

Cisco SSM-4GE

3

2

SPD0123

PWR

STATUS

5

1

4

6

1 Copper Ethernet ports 5 Status LED

2 RJ-45 Link LED 6 Fiber Ethernet ports

3 RJ-45 Speed LED 7 SFP Link LED

4 Power LED 8 SFP Speed LED

Note Figure 3-8 shows SFP modules installed in the fiber Ethernet ports. You must

order and install the SFP modules if you want to establish fiber Ethernet
connectivity. For more information on fiber ports and SFP modules, see the

“Installing SFP Modules” section on page 3-5.

Table 3-4 describes the LEDs in Slot 1.

3-12

Table 3-4 LEDs on Bus G1

LED Color State Description

2, 7 LINK Green Solid There is an Ethernet link.

Flashing There is Ethernet activity.

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Chapter 3 Installing the Cisco ASA 5550 Security Appliance

Table 3-4 LEDs on Bus G1 (continued)

LED Color State Description

3, 8 SPEED Off

Green

Amber

4 POWER Green On The system has power.

5 STATUS Green

Green

Amber

What to Do Next

Continue with Chapter 4, “Connecting Cables to Network Interfaces.”

What to Do Next

10 MB There is no network activity.

100 MB There is network activity at

100 Mbps.

1000 MB
(GigE)

Flashing The system is booting.

Solid The system booted correctly.

Solid The system diagnostics failed.

There is network activity at
1000 Mbps.

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What to Do Next

Chapter 3 Installing the Cisco ASA 5550 Security Appliance

3-14

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4

Connecting Cables to Network Interfaces

This chapter describes how to connect the appropriate cables to the Console,
Auxiliary, Management, copper Ethernet, and fiber Ethernet ports.

This chapter includes the following sections:

• Connecting Interface Cables, page 4-1

• What to Do Next, page 4-7

Warning

Caution Read the safety warnings in the Regulatory Compliance and Safety Information for

Only trained and qualified personnel should install, replace, or service this
equipment. Statement 49

the Cisco ASA 5500 Series and follow proper safety procedures when performing

these steps.

Connecting Interface Cables

To connect cables to the network interfaces, perform the following steps:

Step 1 Place the chassis on a flat, stable surface, or in a rack (if you are rack-mounting it).

Step 2 Connect to the Management port.

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Connecting Interface Cables

The adaptive security appliance has a dedicated interface for device management
that is referred to as the Management0/0 port. The Management0/0 port is a Fast
Ethernet interface. This port is similar to the Console port, but the Management0/0
port only accepts incoming traffic to the adaptive security appliance.

Note You can configure any interface to be a management-only interface using

a. Locate an Ethernet cable, which has an RJ-45 connector on each end.

b. Connect one RJ-45 connector to the Management0/0 port, as shown in

c. Connect the other end of the Ethernet cable to the Ethernet port on your

Figure 4-1 Connecting to the Management Port

Chapter 4 Connecting Cables to Network Interfaces

the management-only command. You can also disable management-only
mode on the management interface. For more information about this
command, see the management-only command in the Cisco Security
Appliance Command Reference.

Figure 4-1.

computer or to your management network.

4-2

1

MGMT

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1 Management port 2 RJ-45 to RJ-45 Ethernet cable

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Step 3 Connect to the Console port.

a. Before connecting a computer or terminal to any ports, check to determine the

baud rate of the serial port. The baud rate must match the default baud rate
(9600 baud) of the Console port of the adaptive security appliance.

Set up the terminal as follows: 9600 baud (default), 8 data bits, no parity, 1 stop
bits, and Flow Control (FC) = Hardware.

b. Locate the serial console cable, which has an RJ-45 connector on one end and

a DB-9 connector on the other end for the serial port on your computer.

c. Connect the RJ-45 connector to the Console port of the adaptive security

appliance as shown in Figure 4-2.

d. Connect the DB-9 connector to the console port on your computer.

Figure 4-2 Connecting the Console Cable

Connecting Interface Cables

CONSOLE

Step 4

POWER

STATUS

ACTIVE

FLASH

VPN

FLASH

AUX

1

2

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1 RJ-45 Console port 2 RJ-45 to DB-9 console cable

Connect to the Auxiliary port (labeled AUX).

a. Locate the serial console cable, which has an RJ-45 connector on one end and

a DB-9 connector on the other end for the serial port on your computer.

b. Connect the RJ-45 connector of the cable to the Auxiliary port (labeled AUX)

on the adaptive security appliance, as shown in Figure 4-3.

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Connecting Interface Cables

c. Connect the other end of the cable, the DB-9 connector, to the serial port on

Figure 4-3 Connecting to the AUX Port

1 RJ-45 AUX port 2 RJ-45 to DB-9 console cable

your computer.

FLASH

VPN

FLASH

ACTIVE

POWER

STATUS

Chapter 4 Connecting Cables to Network Interfaces

CONSOLE

AUX

1

2

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4-4

Step 5 Connect to copper Ethernet ports to be used for network connections. Copper

Ethernet ports are available both in Slot 0 and Slot 1.

Note You must use a port in Slot 0 for the inside interface, and a port in Slot 1

for the outside interface.

a. Connect one end of an Ethernet cable to a copper Ethernet port, as shown in

Figure 4-4 and Figure 4-5.

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Figure 4-4 Connecting to a Copper Ethernet Interface in Slot 0

MGMT

USB2

USB1

LNK SPD

3

1 Copper Ethernet ports 2 RJ-45 connector

LNK SPD2LNK SPD1LNK SPD

0

1

2

Connecting Interface Cables

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Figure 4-5 Connecting to a Copper Ethernet Interfaces in Slot 1

L

N

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23

1

Cisco SSM-4GE

0

S

PD

S

ER

U

T

W

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1 Copper Ethernet ports 2 RJ-45 connector

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b. Connect the other end of the Ethernet cable to a network device, such as a

Step 6 Connect to fiber Ethernet ports to be used for network connections.

Note Slot 1 contains four copper Ethernet ports and four fiber Ethernet ports.

For each fiber port you want to use, perform the following steps:

a. Install the SFP module:

Figure 4-6 Removing the Fiber Port Plug

Chapter 4 Connecting Cables to Network Interfaces

router, switch or hub.

You can use both types of ports, but you can only have a total of four
Slot 1 ports in use at a time. For example, you could use two copper
Ethernet ports and two fiber Ethernet ports.

–

Insert and slide the SFP module into the fiber port until you hear a click.
The click indicates that the SFP module is locked into the port.

–

Remove the port plug from the installed SFP as shown in Figure 4-6.

4-6

1

1 Port plug 2 SFP module

b.

Connect the LC connector to the SFP module as shown in Figure 4-7.

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U
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Figure 4-7 Connecting the LC Connector

1 LC connector 2 SFP module

What to Do Next

LN

K

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2

1

Cisco SSM-4GE

0

SP

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USB1

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1

c. Connect the other end of the cable to a network device, such as a router,

switch, or hub.

Step 7 Connect the power cord to the adaptive security appliance and plug the other end

to the power source.

Step 8 Power on the chassis.

What to Do Next

Continue with Chapter 5, “Configuring the Adaptive Security Appliance.”

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5

Configuring the Adaptive Security Appliance

This chapter describes the initial configuration of the adaptive security appliance.
You can perform the configuration steps using either the browser-based Cisco
Adaptive Security Device Manager (ASDM) or the command-line interface
(CLI). However, the procedures in this chapter refer to the method using ASDM.

Note To use ASDM, you must have a DES license or a 3DES-AES license. For more

information, see Appendix A, “Obtaining a DES License or a 3DES-AES

License.”

This chapter includes the following sections:

• About the Factory-Default Configuration, page 5-2

• About the Adaptive Security Device Manager, page 5-2

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• Using the Startup Wizard, page 5-3

• Setting the Media Type for Fiber Interfaces, page 5-6

• What to Do Next, page 5-7

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Chapter 5 Configuring the Adaptive Security Appliance

About the Factory-Default Configuration

About the Factory-Default Configuration

Cisco adaptive security appliances are shipped with a factory-default configuration
that enables quick startup. The factory-default configuration automatically
configures an interface for management so you can quickly connect to the device and
use ASDM to complete your configuration.

By default, the adaptive security appliance Management interface is configured with
a default DHCP address pool. This configuration enables a client on the inside
network to obtain a DHCP address from the adaptive security appliance to connect to
the appliance. Administrators can then configure and manage the adaptive security
appliance using ASDM.

About the Adaptive Security Device Manager

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Chapter 5 Configuring the Adaptive Security Appliance

The Adaptive Security Device Manager (ASDM) is a feature-rich graphical
interface that enables you to manage and monitor the adaptive security appliance.
Its web-based design provides secure access so that you can connect to and
manage the adaptive security appliance from any location by using a web browser.

In addition to its complete configuration and management capability, ASDM
features intelligent wizards to simplify and accelerate the deployment of the
adaptive security appliance.

In addition to the ASDM web configuration tool, you can configure the adaptive
security appliance by using the command-line interface. For more information, see
the Cisco Security Appliance Command Line Configuration Guide and the Cisco

Security Appliance Command Reference.

Using the Startup Wizard

ASDM includes a Startup Wizard to simplify the initial configuration of your
adaptive security appliance. With a few steps, the Startup Wizard enables you to
configure the adaptive security appliance so that it allows packets to flow securely
between the inside network and the outside network.

Using the Startup Wizard

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Note You must use a port in Slot 0 for the inside interface and a port in Slot 1

for the outside interface.

This section describes how to use the Startup Wizard to set basic configuration
parameters. This section includes the following topics:

• Before Launching the Startup Wizard, page 5-4

• Running the Startup Wizard, page 5-4

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Chapter 5 Configuring the Adaptive Security Appliance

Using the Startup Wizard

Before Launching the Startup Wizard

Before you launch the Startup Wizard, perform the following steps:

Step 1 Obtain a DES license or a 3DES-AES license.

To run ASDM, you must have a DES license or a 3DES-AES license. If you did
not purchase one of these licenses with the adaptive security appliance, see

Appendix A, “Obtaining a DES License or a 3DES-AES License” for information

about how to obtain and activate one.

Step 2 Enable Java and Javascript in your web browser.

Step 3 Gather the following information:

• A unique hostname to identify the adaptive security appliance on your

network.

• The IP addresses of your outside interface, inside interface, and any other

interfaces to be configured.

• The IP addresses to use for NAT or PAT configuration.

• The IP address range for the DHCP server.

Running the Startup Wizard

To use the Startup Wizard to set up a basic configuration for the adaptive security
appliance, perform the following steps:

Step 1 If you have not already done so, connect to the management port.

a. Locate an Ethernet cable, which has an RJ-45 connector on each end.

b. Connect one RJ-45 connector to the Management0/0 port.

c. Connect the other end of the Ethernet cable to the Ethernet port on your

computer or to your management network.

d. If you connected to your management network, connect a PC for configuring

the adaptive security appliance to your management network.

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Chapter 5 Configuring the Adaptive Security Appliance

Step 2 Launch the Startup Wizard.

a. On the PC connected to the switch, hub, or management network, launch an

Internet browser.

b. In the address field of the browser, enter this URL: https://192.168.1.1/.

Note The adaptive security appliance ships with a default IP address of

192.168.1.1. Remember to add the “s” in “https” or the connection
fails. HTTPS (HTTP over SSL) provides a secure connection between
your browser and the adaptive security appliance.

c. In the window that requires you to choose the method you want to use to run

the ASDM software, choose either to download the ASDM launcher or to run
the ASDM software as a Java applet.

Step 3 In the dialog box that requires a username and password, leave both fields empty.

Press Enter.

Step 4 Click Ye s to accept the certificates. Click Ye s for all subsequent authentication

and certificate dialog boxes.

ASDM starts.

Using the Startup Wizard

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Step 5 From the Wizards menu, choose Startup Wizard.

Step 6 Follow the instructions in the Startup Wizard to set up your adaptive security

appliance.

For information about any field in the Startup Wizard, click Help at the bottom of
the window.

Note Based on your network security policy, you should also consider configuring the

adaptive security appliance to deny all ICMP traffic through the outside interface
or any other interface that is necessary. You can configure this access control
policy using the icmp command. For more information about the icmp command,
see the Cisco Security Appliance Command Reference.

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Chapter 5 Configuring the Adaptive Security Appliance

Setting the Media Type for Fiber Interfaces

Setting the Media Type for Fiber Interfaces

If you are using any fiber connections in Slot 1, you must change the media type
setting from the default setting to Fiber Connector.

Note Because the default media type setting is for a copper Ethernet port, you do not

need to set the media type setting for copper Ethernet ports you use.

To set the media type for fiber interfaces using ASDM, perform the following
steps starting from the main ASDM window:

Step 1 In the ASDM window, click Configuration.

Step 2 In the Features pane, click Interfaces.

Step 3 Click the 4GE SSM interface and click Edit. The Edit Interface dialog box

appears.

Step 4 Click Configure Hardware Properties. The Hardware Properties dialog box

appears.

5-6

Step 5 From the Media Type drop-down list, choose Fiber Connector.

Step 6 Click OK to return to the Edit Interfaces dialog box, then click OK to return to

the interfaces configuration dialog box.

Step 7 Repeat this procedure for each fiber interface.

You can also set the media type from the command line. For more information,
see Configuring Ethernet Settings and Subinterfaces in the Cisco Security

Appliance Command Line Configuration Guide.

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Chapter 5 Configuring the Adaptive Security Appliance

What to Do Next

Next, configure the adaptive security appliance for your deployment using one or
more of the following chapters:

To Do This ... See ...

Configure the adaptive security
appliance to protect a DMZ web server

Configure the adaptive security
appliance for remote-access VPN

Configure the adaptive security
appliance for Site-to-Site VPN

What to Do Next

Chapter 6, “Scenario: DMZ
Configuration”

Chapter 7, “Scenario: Remote-Access
VPN Configuration”

Chapter 8, “Scenario: Site-to-Site
VPN Configuration”

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Scenario: DMZ Configuration

This chapter describes a configuration scenario in which the adaptive security
appliance is used to protect network resources located in a demilitarized zone
(DMZ). A DMZ is a separate network located in the neutral zone between a
private (inside) network and a public (outside) network.

This chapter includes the following sections:

• Example DMZ Network Topology, page 6-1

• Configuring the Security Appliance for a DMZ Deployment, page 6-4

• What to Do Next, page 6-24

Example DMZ Network Topology

6

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The example network topology shown in Figure 6-1 is typical of most DMZ
implementations of the adaptive security appliance.

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Example DMZ Network Topology

Figure 6-1 Network Layout for DMZ Configuration Scenario

Security

HTTP client

inside interface

10.10.10.0

(private address)

10.10.10.0

(private address)

Appliance

outside interface

209.165.200.225
(public address)

DMZ interface

10.30.30.0

(private address)

Internet

Chapter 6 Scenario: DMZ Configuration

HTTP client

HTTP client

DMZ Web

Server

Private IP address: 10.30.30.30
Public IP address: 209.165.200.226

132064

This example scenario has the following characteristics:

• The web server is on the DMZ interface of the adaptive security appliance.

• HTTP clients on the private network can access the web server in the DMZ

and can also communicate with devices on the Internet.

• Clients on the Internet are permitted HTTP access to the DMZ web server; all

other traffic is denied.

• The network has two routable IP addresses that are publicly available: one for

the outside interface of the adaptive security appliance (209.165.200.225),
and one for the public IP address of the DMZ web server (209.165.200.226).

Figure 6-2 shows the outgoing traffic flow of HTTP requests from the private

network to both the DMZ web server and to the Internet.

6-2

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Chapter 6 Scenario: DMZ Configuration

Figure 6-2 Outgoing HTTP Traffic Flow from the Private Network

Internal IP address

translated to address

of outside interface

HTTP client

Security

Appliance

Example DMZ Network Topology

10.10.10.0

(private address)

Internal IP address

translated to address

HTTP request

HTTP request

from IP pool

DMZ network

DMZ Web

Server

outside interface

209.165.200.225
(public address)

Private IP address: 10.30.30.30
Public IP address: 209.165.200.226

Internet

HTTP client

HTTP client

In Figure 6-2, the adaptive security appliance permits HTTP traffic originating
from inside clients and destined for both the DMZ web server and devices on the
Internet. To permit the traffic through, the adaptive security appliance
configuration includes the following:

• Access control rules permitting traffic destined for the DMZ web server and

for devices on the Internet.

• Address translation rules translating private IP addresses so that the private

addresses are not visible to the Internet.

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For traffic destined for the DMZ web server, private IP addresses are
translated to an address from an IP pool.

For traffic destined for the Internet, private IP addresses are translated to the
public IP address of the adaptive security appliance. Outgoing traffic appears
to come from this address.

Figure 6-3 shows HTTP requests originating from the Internet and destined for

the public IP address of the DMZ web server.

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Configuring the Security Appliance for a DMZ Deployment

Figure 6-3 Incoming HTTP Traffic Flow From the Internet

HTTP request

1

sent to public address
of DMZ web server.

Internet

Security

Appliance

2

Incoming request
destined for public
address of DMZ web
server intercepted.

3

Destination IP address
translated to the private IP
address of the web server.

4

Web server receives
request for content.

Chapter 6 Scenario: DMZ Configuration

HTTP client

HTTP client

DMZ Web

Server

Private IP address: 10.30.30.30
Public IP address: 209.165.200.226

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To permit incoming traffic to access the DMZ web server, the adaptive security
appliance configuration includes the following:

• An address translation rule translating the public IP address of the DMZ web

server to the private IP address of the DMZ web server.

• An access control rule permitting incoming HTTP traffic that is destined for

the DMZ web server.

The procedures for creating this configuration are detailed in the remainder of this
chapter.

Configuring the Security Appliance for a DMZ
Deployment

This section describes how to use ASDM to configure the adaptive security
appliance for the configuration scenario shown in Figure 6-1. The procedure uses
sample parameters based on the scenario.

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Chapter 6 Scenario: DMZ Configuration

This configuration procedure assumes that the adaptive security appliance already
has interfaces configured for the inside interface, the DMZ interface, and the
outside interface. Set up interfaces of the adaptive security appliance by using the
Startup Wizard in ASDM. Be sure that the DMZ interface security level is set
between 0 and 100. (A common choice is 50.)

For more information about using the Startup Wizard, see Chapter 5,

“Configuring the Adaptive Security Appliance.”

The section includes the following topics:

• Configuration Requirements, page 6-5

• Starting ASDM, page 6-6

• Creating IP Pools for Network Address Translation, page 6-7

• Configuring NAT for Inside Clients to Communicate with the DMZ Web

Server, page 6-12

• Configuring NAT for Inside Clients to Communicate with Devices on the

Internet, page 6-15

• Configuring an External Identity for the DMZ Web Server, page 6-16

• Providing Public HTTP Access to the DMZ Web Server, page 6-18

The following sections provide detailed instructions for how to perform each step.

Configuring the Security Appliance for a DMZ Deployment

Configuration Requirements

Configuring the adaptive security appliance for this DMZ deployment requires the
following configuration tasks:

• For the internal clients to have HTTP access to the DMZ web server, you must

create a pool of IP addresses for address translation and identify which clients
should use addresses from the pool. To accomplish this task, you should
configure the following:

–

A pool of IP addresses for the DMZ interface. In this scenario, the IP pool
is 10.30.30.50–10.30.30.60.

–

A dynamic NAT translation rule for the inside interface that specifies
which client IP addresses can be assigned an address from the IP pool.

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• For the internal clients to have access to HTTP and HTTPS resources on the

Internet, you must create a rule that translates the real IP addresses of internal
clients to an external address that can be used as the source address.

To accomplish this task, you should configure a PAT translation rule (port
address translation rule, sometimes called an interface NAT) for the internal
interface that translates internal IP addresses to the external IP address of the
adaptive security appliance.

In this scenario, the internal address to be translated is that of a subnet of the
private network (10.10.10.0). Addresses from this subnet are translated to the
public address of the adaptive security appliance (209.165.200.225).

• For external clients to have HTTP access to the DMZ web server, you must

configure an external identity for the DMZ web server and an access rule that
permits HTTP requests coming from clients on the Internet. To accomplish
this task, you should configure the following:

–

Create a static NAT rule. This rule translates the real IP address of the
DMZ web server to a single public IP address. In this scenario, the public
address of the web server is 209.165.200.226.

–

Create a security access rule permitting traffic from the Internet if the
traffic is an HTTP request destined for the public IP address of the DMZ
web server.

Chapter 6 Scenario: DMZ Configuration

Starting ASDM

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To run ASDM in a web browser, enter the factory-default IP address in the address
field: https://192.168.1.1/admin/.

Note Remember to add the “s” in “https” or the connection fails. HTTPS

(HTTP over SSL) provides a secure connection between your browser and
the adaptive security appliance.

The Main ASDM window appears.

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Chapter 6 Scenario: DMZ Configuration

Configuring the Security Appliance for a DMZ Deployment

Creating IP Pools for Network Address Translation

The adaptive security appliance uses Network Address Translation (NAT) and
Port Address Translation (PAT) to prevent internal IP addresses from being
exposed externally. This procedure describes how to create a pool of IP addresses
that the DMZ interface and outside interface can use for address translation.

A single IP pool can contain both NAT and PAT entries, and it can contain entries
for more than one interface.

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Configuring the Security Appliance for a DMZ Deployment

To configure a pool of IP addresses that can be used for network address
translation, perform the following steps:

Step 1 In the ASDM window, click the Configuration tool.

a. In the Features pane, click NAT.

The NAT Configuration screen appears.

Chapter 6 Scenario: DMZ Configuration

6-8

b. In the right pane, click the Global Pools tab.

c. Click Add to create a new global pool for the DMZ interface.

The Add Global Address Pool dialog box appears.

Note For most configurations, IP pools are added to the less secure, or public,

interfaces.

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Chapter 6 Scenario: DMZ Configuration

d. From the Interfaces drop-down list, choose DMZ.

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e. To create a new IP pool, enter a unique Pool ID. In this scenario, the Pool ID

is 200.

f. In the IP Addresses to Add area, specify the range of IP addresses to be used

by the DMZ interface:

–

Click the Range radio button.

–

Enter the Starting IP address and Ending IP address of the range. In this
scenario, the range of IP addresses is 10.30.30.50–10.30.30.60.

–

(Optional) Enter the Netmask for the range of IP addresses.

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Configuring the Security Appliance for a DMZ Deployment

g. Click Add to add this range of IP addresses to the Address Pool.

The Add Global Pool dialog box configuration should be similar to the
following:

Chapter 6 Scenario: DMZ Configuration

6-10

h. Click OK to return to the Configuration > NAT window.

Step 2 Add addresses to the IP pool to be used by the outside interface. These addresses

are used to translate private IP addresses so that inside clients can communicate
securely with clients on the Internet.

In this scenario, there are limited public IP addresses available. Use Port Address
Translation (PAT) so that many internal IP addresses can map to the same public
IP address, as follows:

a. In the right pane of the NAT Configuration screen, click the Global Pools tab.

b. Under the Global Pools tab, click Add.

The Add Global Pool Item dialog box appears.

c. From the Interface drop-down list, choose Outside.

d. Specify a Pool ID for the Outside interface.

You can add these addresses to the same IP pool that contains the address pool
used by the DMZ interface (in this scenario, the Pool ID is 200).

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Chapter 6 Scenario: DMZ Configuration

e. Click the Port Address Translation (PAT) using the IP address of the

interface radio button.

If you select the option Port Address Translation using the IP address of the
interface, all traffic initiated from the inside network exits the adaptive
security appliance using the IP address of the outside interface. To the devices
on the Internet, it appears that all traffic is coming from this one IP address.

f. Click the Add button to add this new address to the IP pool.

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g. Click OK.

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The displayed configuration should be similar to the following:

Chapter 6 Scenario: DMZ Configuration

Step 3 Confirm that the configuration values are correct.

Step 4 Click Apply in the main ASDM window.

Configuring NAT for Inside Clients to Communicate with the DMZ Web Server

In the previous procedure, you created a pool of IP addresses that could be used
by the adaptive security appliance to mask the private IP addresses of inside
clients.

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Chapter 6 Scenario: DMZ Configuration

In this procedure, you configure a Network Address Translation (NAT) rule that
associates IP addresses from this pool with the inside clients so they can
communicate securely with the DMZ web server.

To configure NAT between the inside interface and the DMZ interface, perform
the following steps starting from the main ASDM window:

Step 1 In the main ASDM window, click the Configuration tool.

Step 2 In the Features pane, click NAT.

Step 3 From the Add drop-down list, choose Add Dynamic NAT Rule.

The Add Dynamic NAT Rule dialog box appears.

Step 4 In the Real Address area, specify the IP address to be translated. For this scenario,

address translation for inside clients is done according to the IP address of the
subnet.

a. From the Interface drop-down list, choose the Inside interface.

b. Enter the IP address of the client or network. In this scenario, the IP address

of the network is 10.10.10.0.

c. From the Netmask drop-down list, choose the Netmask. In this scenario, the

netmask is 255.255.255.0.

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Step 5 In the Dynamic Translation area:

a. From the Interface drop-down list, choose the DMZ interface.

b. To specify the address pool to be used for this Dynamic NAT rule, check the

Select check box next to Global Pool ID. In this scenario, the IP pool ID is

200.

In this scenario, the IP pool that we want to use is already created. If it was
not already created, you would click Add to create a new IP pool.

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Chapter 6 Scenario: DMZ Configuration

6-14

c. Click OK to add the Dynamic NAT Rule and return to the Configuration >

NAT window.

Review the configuration screen to verify that the translation rule appears as you
expected.

Note When you click OK to create this rule, notice that there are actually two

translation rules created:

• A translation rule between the inside and DMZ interfaces to be used when

inside clients communicate with the DMZ web server.

• A translation rule between the inside and outside interfaces to be used when

inside clients communicate with the Internet.

ASDM is able to create both rules because the addresses to be used for translation
are both in the same IP pool.

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Chapter 6 Scenario: DMZ Configuration

The displayed configuration should be similar to the following:

Configuring the Security Appliance for a DMZ Deployment

Step 6 Click Apply to complete the adaptive security appliance configuration changes.

Configuring NAT for Inside Clients to Communicate with Devices on the Internet

In the previous procedure, you configured a Network Address Translation (NAT)
rule that associates IP addresses from the IP pool with the inside clients so they
can communicate securely with the DMZ web server.

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Chapter 6 Scenario: DMZ Configuration

Configuring the Security Appliance for a DMZ Deployment

For many configurations you would also need to create a NAT rule between the
inside interface and the outside interface to enable inside clients to communicate
with the Internet.

However, in this scenario you do not need to create this rule explicitly. The reason
is that the IP pool (pool ID 200) contains both types of addresses needed for
address translation: the range of IP addresses to be used by the DMZ interface,
and the IP address to be used for the outside interface. This enables ASDM to
create the second translation rule for you.

Configuring an External Identity for the DMZ Web Server

The DMZ web server needs to be accessible by all hosts on the Internet. This
configuration requires translating the private IP address of the DMZ web server
to a public IP address, enabling access to outside HTTP clients that are unaware
of the adaptive security appliance. To map the real web server IP address
(10.30.30.30) statically to a public IP address (209.165.200.226), perform the
following steps:

6-16

Step 1 In the ASDM window, click the Configuration tool.

Step 2 In the Features pane, click NAT.

Step 3 From the Add drop-down list, choose Add Static NAT Rule. The Add Static NAT

Rule dialog box appears.

Step 4 In the Real Address area, specify the real IP address of the web server:

a. From the Interface drop-down list, choose the DMZ interface.

b. Enter the real IP address of the DMZ web server. In this scenario, the IP

address is 10.30.30.30.

c. From the Netmask drop-down list, choose the Netmask 255.255.255.255.

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Configuring the Security Appliance for a DMZ Deployment

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Step 5 In the Static Translation area, specify the public IP address to be used for the web

server:

a. From the Interface drop-down list, choose Outside.

b. From the IP Address drop-down list, choose the public IP address of the DMZ

web server.

In this scenario, the public IP address of the DMZ web server is

209.165.200.226.

Step 6 Click OK to add the rule and return to the list of Address Translation Rules.

This rule maps the real web server IP address (10.30.30.30) statically to the public
IP address of the web server (209.165.200.226).

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Configuring the Security Appliance for a DMZ Deployment

The displayed configuration should be similar to the following:

Chapter 6 Scenario: DMZ Configuration

Step 7 Click Apply to complete the adaptive security appliance configuration changes.

Providing Public HTTP Access to the DMZ Web Server

By default, the adaptive security appliance denies all traffic coming in from the
public network. You must create an access control rule on the adaptive security
appliance to permit specific traffic types from the public network to resources in
the DMZ. This access control rule specifies the interface of the adaptive security

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Chapter 6 Scenario: DMZ Configuration

appliance that processes the traffic, whether the traffic is incoming or outgoing,
the origin and destination of the traffic, and the type of traffic protocol and service
to be permitted.

In this section, you create an access rule that permits incoming HTTP traffic
originating from any host or network on the Internet, if the destination of the
traffic is the web server on the DMZ network. All other traffic coming in from the
public network is denied.

To configure the access control rule, perform the following steps:

Step 1 In the ASDM window:

a. Click the Configuration tool.

b. In the Features pane, click Security Policy.

c. Click the Access Rules tab, and then from the Add pull-down list, choose

Add Access Rule.

The Add Access Rule dialog box appears.

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Configuring the Security Appliance for a DMZ Deployment

Chapter 6 Scenario: DMZ Configuration

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Step 2 In the Interface and Action area:

a. From the Interface drop-down list, choose Outside.

b. From the Direction drop-down list, choose Incoming.

c. From the Action drop-down list, choose Permit.

Step 3 In the Source area:

a. From the Type drop-down list, choose IP Address.

b. Enter the IP address of the source host or source network. Use 0.0.0.0 to allow

traffic originating from any host or network.

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Chapter 6 Scenario: DMZ Configuration

Alternatively, if the address of the source host or network is preconfigured,
choose the source IP address from the IP Address drop-down list.

c. Enter the netmask for the source IP address or select one from the Netmask

drop-down list.

Step 4 In the Destination area:

a. In the IP address field, enter the public IP address of the destination host or

network, such as a web server. (In this scenario, the public IP address of the
DMZ web server is 209.165.200.226.)

Step 5 In the Protocol and Service area, specify the type of traffic that you want to permit

through the adaptive security appliance.

a. From the Protocol drop-down list, choose tcp.

b. In the Source Port area, click the Service radio button, choose “=” (equal to)

from the Service drop-down list, and then choose Any from the next
drop-down list.

c. In the Destination Port area, click the Service radio button, choose “=” (equal

to) from the Service drop-down list, and then choose HTTP/WWW from the
next drop-down list.

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Configuring the Security Appliance for a DMZ Deployment

At this point, the entries in the Add Access Rule dialog box should be similar to
the following:

Chapter 6 Scenario: DMZ Configuration

6-22

d. Click OK.

Step 6 The displayed configuration should be similar to the following. Verify that the

information you entered is accurate.

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Chapter 6 Scenario: DMZ Configuration

Configuring the Security Appliance for a DMZ Deployment

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Step 7 Click Apply to save the configuration changes to the configuration that the

adaptive security appliance is currently running.

Clients on both the private and public networks can now resolve HTTP requests
for content from the DMZ web server, while keeping the private network secure.

Note Although the destination address specified is the private address of the DMZ web

server (10.30.30.30), HTTP traffic from any host on the Internet destined for the
public address 209.165.200.226 is permitted through the adaptive security
appliance. The address translation (209.165.200.226 to 10.30.30.30) allows the
traffic to be permitted. For information about creating the translation rule, see the

“Configuring NAT for Inside Clients to Communicate with the DMZ Web Server”
section on page 6-12.

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What to Do Next

Step 8 If you want the configuration changes to be saved to the startup configuration so

that they are applied the next time the device starts, from the File menu, click
Save.

Alternatively, ASDM prompts you to save the configuration changes permanently
when you exit ASDM.

If you do not save the configuration changes, the old configuration takes effect the
next time the device starts.

What to Do Next

If you are deploying the adaptive security appliance solely to protect a web server
in a DMZ, you have completed the initial configuration. You may want to consider
performing some of the following additional steps:

To Do This ... See ...

Refine configuration and configure
optional and advanced features

Learn about daily operations Cisco Security Appliance Command

Chapter 6 Scenario: DMZ Configuration

Cisco Security Appliance Command
Line Configuration Guide

Reference

Cisco Security Appliance Logging
Configuration and System Log
Messages

6-24

You can configure the adaptive security appliance for more than one application.
The following sections provide configuration procedures for other common
applications of the adaptive security appliance.

To Do This ... See ...

Configure a remote-access VPN Chapter 7, “Scenario: Remote-Access

VPN Configuration”

Configure a site-to-site VPN Chapter 8, “Scenario: Site-to-Site

VPN Configuration”

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CHA P T E R

7

Scenario: Remote-Access VPN Configuration

This chapter describes how to use the adaptive security appliance to accept
remote-access IPsec VPN connections. A remote-access VPN enables you to
create secure connections, or tunnels, across the Internet, thus providing secure
access to off-site users.

If you are implementing an Easy VPN solution, this chapter describes how to
configure the Easy VPN server (sometimes called a headend device).

This chapter includes the following sections:

• Example IPsec Remote-Access VPN Network Topology, page 7-1

• Implementing the IPsec Remote-Access VPN Scenario, page 7-2

• What to Do Next, page 7-18

Example IPsec Remote-Access VPN Network Topology

Figure 7-1 shows an adaptive security appliance configured to accept requests

from and establish IPsec connections with VPN clients, such as a Cisco Easy VPN
hardware client, over the Internet.

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Implementing the IPsec Remote-Access VPN Scenario

Figure 7-1 Network Layout for Remote Access VPN Scenario

DNS Server

10.10.10.163

Chapter 7 Scenario: Remote-Access VPN Configuration

VPN client

VPN client

VPN client

Internal

network

WINS Server

10.10.10.133

Inside

10.10.10.0

Security

Appliance

Outside

Internet

Implementing the IPsec Remote-Access VPN
Scenario

This section describes how to configure the adaptive security appliance to accept
IPsec VPN connections from remote clients and devices. If you are implementing
an Easy VPN solution, this section describes how to configure an Easy VPN
server (also known as a headend device).

(user 1)

(user 2)

(user 3)

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7-2

Values for example configuration settings are taken from the remote-access
scenario illustrated in Figure 7-1.

This section includes the following topics:

• Information to Have Available, page 7-3

• Starting ASDM, page 7-4

• Configuring the ASA 5550 for an IPsec Remote-Access VPN, page 7-5

• Selecting VPN Client Types, page 7-6

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Chapter 7 Scenario: Remote-Access VPN Configuration

• Specifying the VPN Tunnel Group Name and Authentication Method,

page 7-7

• Specifying a User Authentication Method, page 7-8

• (Optional) Configuring User Accounts, page 7-10

• Configuring Address Pools, page 7-11

• Configuring Client Attributes, page 7-12

• Configuring the IKE Policy, page 7-13

• Configuring IPsec Encryption and Authentication Parameters, page 7-15

• Specifying Address Translation Exception and Split Tunneling, page 7-16

• Verifying the Remote-Access VPN Configuration, page 7-17

Information to Have Available

Before you begin configuring the adaptive security appliance to accept remote
access IPsec VPN connections, make sure that you have the following information
available:

• Range of IP addresses to be used in an IP pool. These addresses are assigned

to remote VPN clients as they are successfully connected.

• List of users to be used in creating a local authentication database, unless you

are using a AAA server for authentication.

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• Networking information to be used by remote clients when connecting to the

VPN, including:

–

IP addresses for the primary and secondary DNS servers

–

IP addresses for the primary and secondary WINS servers

–

Default domain name

–

List of IP addresses for local hosts, groups, and networks that should be
made accessible to authenticated remote clients

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Implementing the IPsec Remote-Access VPN Scenario

Starting ASDM

To run ASDM in a web browser, enter the factory default IP address in the address
field: https://192.168.1.1/admin/.

Note Remember to add the “s” in “https” or the connection fails. HTTPS

(HTTP over SSL) provides a secure connection between your browser and
the adaptive security appliance.

The Main ASDM window appears.

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Chapter 7 Scenario: Remote-Access VPN Configuration

Implementing the IPsec Remote-Access VPN Scenario

Configuring the ASA 5550 for an IPsec Remote-Access VPN

To begin the process for configuring a remote-access VPN, perform the following
steps:

Step 1 In the main ASDM window, choose VPN Wizard from the Wizards drop-down

menu. The VPN Wizard Step 1 screen appears.

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Step 2 In Step 1 of the VPN Wizard, perform the following steps:

a. Click the Remote Access VPN radio button.

b. From the drop-down list, choose Outside as the enabled interface for the

incoming VPN tunnels.

c. Click Next to continue.

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Implementing the IPsec Remote-Access VPN Scenario

Selecting VPN Client Types

In Step 2 of the VPN Wizard, perform the following steps:

Step 1 Specify the type of VPN client that will enable remote users to connect to this

adaptive security appliance. For this scenario, click the Cisco VPN Client radio
button.

You can also use any other Cisco Easy VPN remote product.

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Step 2 Click Next to continue.

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Chapter 7 Scenario: Remote-Access VPN Configuration

Implementing the IPsec Remote-Access VPN Scenario

Specifying the VPN Tunnel Group Name and Authentication Method

In Step 3 of the VPN Wizard, perform the following steps:

Step 1 Specify the type of authentication that you want to use by performing one of the

following steps:

• To use a static preshared key for authentication, click the Pre-Shared Key

radio button and enter a preshared key (for example, “Cisco”). This key is
used for IPsec negotiations between the adaptive security appliances.

• To use digital certificates for authentication, click the Certificate radio

button, choose the Certificate Signing Algorithm from the drop-down list,
and then choose a preconfigured trustpoint name from the drop-down list.

If you want to use digital certificates for authentication but have not yet
configured a trustpoint name, you can continue with the Wizard by using one
of the other two options. You can revise the authentication configuration later
using the standard ASDM screens.

• Click the Challenge/Response Authentication (CRACK) radio button to

use that method of authentication.

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Implementing the IPsec Remote-Access VPN Scenario

Chapter 7 Scenario: Remote-Access VPN Configuration

Step 2 Enter a Tunnel Group Name (such as “Cisco”) for the set of users that use

common connection parameters and client attributes to connect to this adaptive
security appliance.

Step 3 Click Next to continue.

Specifying a User Authentication Method

Users can be authenticated either by a local authentication database or by using
external authentication, authorization, and accounting (AAA) servers (RADIUS,
TACACS+, SDI, NT, Kerberos, and LDAP).

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Chapter 7 Scenario: Remote-Access VPN Configuration

In Step 4 of the VPN Wizard, perform the following steps:

Step 1 If you want to authenticate users by creating a user database on the adaptive

security appliance, click the Authenticate Using the Local User Database radio
button.

Step 2 If you want to authenticate users with an external AAA server group:

a. Click the Authenticate Using an AAA Server Group radio button.

b. Choose a preconfigured server group from the drop-down list, or click New

to add a new server group.

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Step 3 Click Next to continue.

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Chapter 7 Scenario: Remote-Access VPN Configuration

Implementing the IPsec Remote-Access VPN Scenario

(Optional) Configuring User Accounts

If you have chosen to authenticate users with the local user database, you can
create new user accounts here. You can also add users later using the ASDM
configuration interface.

In Step 5 of the VPN Wizard, perform the following steps:

Step 1 To add a new user, enter a username and password, and then click Add.

7-10

Step 2 When you have finished adding new users, click Next to continue.

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Chapter 7 Scenario: Remote-Access VPN Configuration

Configuring Address Pools

For remote clients to gain access to your network, you must configure a pool of
IP addresses that can be assigned to remote VPN clients as they are successfully
connected. In this scenario, the pool is configured to use the range of IP addresses

209.165.201.1–209.166.201.20.

In Step 6 of the VPN Wizard, perform the following steps:

Step 1 Enter a pool name or choose a preconfigured pool from the drop-down list.

Alternatively, click New to create a new address pool.

The Add IP Pool dialog box appears.

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Step 2 In the Add IP Pool dialog box:

a. Enter the Starting IP address and Ending IP address of the range.

b. (Optional) Enter the Netmask for the range of IP addresses.

c. Click OK to return to Step 6 of the VPN Wizard.

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Implementing the IPsec Remote-Access VPN Scenario

Chapter 7 Scenario: Remote-Access VPN Configuration

Step 3 Click Next to continue.

Configuring Client Attributes

To access your network, each remote access client needs basic network
configuration information, such as which DNS and WINS servers to use and the
default domain name. Rather than configuring each remote client individually,
you can provide the client information to ASDM. The adaptive security appliance
pushes this information to the remote client or Easy VPN hardware client when a
connection is established.

Ensure that you specify the correct values, or remote clients will not be able to use
DNS names for resolution or use Windows networking.

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Chapter 7 Scenario: Remote-Access VPN Configuration

In Step 7 of the VPN Wizard, perform the following steps:

Step 1 Enter the network configuration information to be pushed to remote clients.

Implementing the IPsec Remote-Access VPN Scenario

Step 2 Click Next to continue.

Configuring the IKE Policy

IKE is a negotiation protocol that includes an encryption method to protect data
and ensure privacy; it is also an authentication method to ensure the identity of the
peers. In most cases, the ASDM default values are sufficient to establish secure
VPN tunnels.

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Implementing the IPsec Remote-Access VPN Scenario

To specify the IKE policy in Step 8 of the VPN Wizard, perform the following
steps:

Step 1 Click the Encryption (DES/3DES/AES), authentication algorithms (MD5/SHA),

and the Diffie-Hellman group (1/2/5/7) used by the
during an IKE security association.

Chapter 7 Scenario: Remote-Access VPN Configuration

adaptive security appliance

7-14

Step 2 Click Next to continue.

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Chapter 7 Scenario: Remote-Access VPN Configuration

Implementing the IPsec Remote-Access VPN Scenario

Configuring IPsec Encryption and Authentication Parameters

In Step 9 of the VPN Wizard, perform the following steps:

Step 1 Click the Encryption algorithm (DES/3DES/AES) and authentication algorithm

(MD5/SHA).

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Step 2 Click Next to continue.

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Chapter 7 Scenario: Remote-Access VPN Configuration

Implementing the IPsec Remote-Access VPN Scenario

Specifying Address Translation Exception and Split Tunneling

Split tunneling lets a remote-access IPsec client conditionally direct packets over
an IPsec tunnel in encrypted form or to a network interface in clear text form.

The adaptive security appliance uses Network Address Translation (NAT) to
prevent internal IP addresses from being exposed externally. You can make
exceptions to this network protection by identifying local hosts and networks that
should be made accessible to authenticated remote users. (In this scenario, the
entire inside network 10.10.10.0 is exposed to all remote clients.)

In Step 10 of the VPN Wizard, perform the following steps:

Step 1 Specify hosts, groups, and networks that should be in the list of internal resources

made accessible to authenticated remote users.

To add or remove hosts, groups, and networks dynamically from the Selected
Hosts/Networks pane, click Add or Delete, respectively.

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Chapter 7 Scenario: Remote-Access VPN Configuration

Implementing the IPsec Remote-Access VPN Scenario

Note Enable split tunneling by checking the Enable Split Tunneling check box

at the bottom of the screen. Split tunneling allows traffic outside the
configured networks to be sent out directly to the Internet instead of over
the encrypted VPN tunnel.

Step 2 Click Next to continue.

Verifying the Remote-Access VPN Configuration

In Step 11 of the VPN Wizard, review the configuration attributes for the VPN
tunnel you just created. The displayed configuration should be similar to the
following:

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What to Do Next

If you are satisfied with the configuration, click Finish to apply the changes to the
adaptive security appliance.

If you want the configuration changes to be saved to the startup configuration so
that they are applied the next time the device starts, from the File menu, click
Save. Alternatively, ASDM prompts you to save the configuration changes
permanently when you exit ASDM.

If you do not save the configuration changes, the old configuration takes effect the
next time the device starts.

What to Do Next

If you are deploying the adaptive security appliance solely in a remote-access
VPN environment, you have completed the initial configuration. In addition, you
may want to consider performing some of the following steps:

To Do This ... See ...

Refine configuration and configure
optional and advanced features

Learn about daily operations Cisco Security Appliance Command

Chapter 7 Scenario: Remote-Access VPN Configuration

Cisco Security Appliance Command
Line Configuration Guide

Reference

7-18

Cisco Security Appliance Logging
Configuration and System Log
Messages

You can configure the adaptive security appliance for more than one application.
The following sections provide configuration procedures for other common
applications of the adaptive security appliance.

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Chapter 7 Scenario: Remote-Access VPN Configuration

To Do This ... See ...

Configure the adaptive security
appliance to protect a Web server in a
DMZ

Configure a site-to-site VPN Chapter 8, “Scenario: Site-to-Site

What to Do Next

Chapter 6, “Scenario: DMZ
Configuration”

VPN Configuration”

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What to Do Next

Chapter 7 Scenario: Remote-Access VPN Configuration

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CHA P T E R

8

Scenario: Site-to-Site VPN Configuration

This chapter describes how to use the adaptive security appliance to create a
site-to-site VPN.

Site-to-site VPN features provided by the adaptive security appliance enable
businesses to extend their networks across low-cost public Internet connections to
business partners and remote offices worldwide while maintaining their network
security. A VPN connection enables you to send data from one location to another
over a secure connection, or tunnel, first by authenticating both ends of the
connection, and then by automatically encrypting all data sent between the two
sites.

This chapter includes the following sections:

• Example Site-to-Site VPN Network Topology, page 8-1

• Implementing the Site-to-Site Scenario, page 8-2

• Configuring the Other Side of the VPN Connection, page 8-13

• What to Do Next, page 8-13

Example Site-to-Site VPN Network Topology

Figure 8-1 shows an example VPN tunnel between two adaptive security

appliances.

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Chapter 8 Scenario: Site-to-Site VPN Configuration

Implementing the Site-to-Site Scenario

Figure 8-1 Network Layout for Site-to-Site VPN Configuration Scenario

Site A

Inside

10.10.10.0

Security

Appliance 1

209.165.200.226

Outside

Internet

Outside

209.165.200.236

Security

Appliance 2

Creating a VPN site-to-site deployment such as the one in Figure 8-1 requires you
to configure two adaptive security appliances, one on each side of the connection.

Implementing the Site-to-Site Scenario

This section describes how to configure the adaptive security appliance in a
site-to-site VPN deployment, using example parameters from the remote-access
scenario shown in Figure 8-1.

This section includes the following sections:

• Information to Have Available, page 8-2

• Configuring the Site-to-Site VPN, page 8-3

Information to Have Available

Inside

10.20.20.0

Site B

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8-2

Before you begin the configuration procedure, gather the following information:

• IP address of the remote adaptive security appliance peer

• IP addresses of local hosts and networks permitted to use the tunnel to

communicate with resources on the remote site

• IP addresses of remote hosts and networks permitted to use the tunnel to

communicate with local resources

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Configuring the Site-to-Site VPN

This section describes how to use the ASDM VPN Wizard to configure the
adaptive security appliance for a site-to-site VPN.

This section includes the following topics:

• Starting ASDM, page 8-3

• Configuring the Security Appliance at the Local Site, page 8-4

• Providing Information About the Remote VPN Peer, page 8-6

• Configuring the IKE Policy, page 8-7

• Configuring IPsec Encryption and Authentication Parameters, page 8-9

• Specifying Hosts and Networks, page 8-10

• Viewing VPN Attributes and Completing the Wizard, page 8-11

The following sections provide detailed instructions for how to perform each
configuration step.

Implementing the Site-to-Site Scenario

Starting ASDM

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To run ASDM in a web browser, enter the factory default IP address in the address
field: https://192.168.1.1/admin/.

Note Remember to add the “s” in “https” or the connection fails. HTTPS

(HTTP over SSL) provides a secure connection between your browser and
the adaptive security appliance.

The Main ASDM window appears.

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Implementing the Site-to-Site Scenario

Chapter 8 Scenario: Site-to-Site VPN Configuration

Configuring the Security Appliance at the Local Site

Note The adaptive security appliance at the first site is referred to as Security

Appliance 1 from this point forward.

To configure the Security Appliance 1, perform the following steps:

Step 1 In the main ASDM window, choose the VPN Wizard option from the Wizards

drop-down menu. ASDM opens the first VPN Wizard screen.

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Chapter 8 Scenario: Site-to-Site VPN Configuration

In Step 1 of the VPN Wizard, perform the following steps:

a. Click the Site-to-Site VPN radio button.

Note The Site-to-Site VPN option connects two IPsec security gateways,

which can include adaptive security appliances, VPN concentrators,
or other devices that support site-to-site IPsec connectivity.

b. From the drop-down list, choose Outside as the enabled interface for the

current VPN tunnel.

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c. Click Next to continue.

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Chapter 8 Scenario: Site-to-Site VPN Configuration

Implementing the Site-to-Site Scenario

Providing Information About the Remote VPN Peer

The VPN peer is the system on the other end of the connection that you are
configuring, usually at a remote site.

Note In this scenario, the remote VPN peer is referred to as Security Appliance 2 from

this point forward.

In Step 2 of the VPN Wizard, perform the following steps:

Step 1 Enter the Peer IP Address (the IP address of Security Appliance 2, in this scenario

209.165.200.236) and a Tunnel Group Name (for example “Cisco”).

Step 2 Specify the type of authentication that you want to use by performing one of the

following steps:

• To use a static preshared key for authentication, click the Pre-Shared Key

radio button and enter a preshared key (for example, “Cisco”). This key is
used for IPsec negotiations between the adaptive security appliances.

8-6

Note When you configure Security Appliance 2 at the remote site, the VPN

peer is Security Appliance 1. Be sure to enter the same preshared key
(Cisco) that you use here.

• Click the Challenge/Response Authentication radio button to use that

method of authentication.

• To use digital certificates for authentication, click the Certificate radio

button, choose the Certificate Signing Algorithm from the drop-down list,
and then choose a preconfigured trustpoint name from the drop-down list.

If you want to use digital certificates for authentication but have not yet
configured a trustpoint name, you can continue with the Wizard by using one
of the other two options. You can revise the authentication configuration later
using the standard ASDM screens.

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Chapter 8 Scenario: Site-to-Site VPN Configuration

Implementing the Site-to-Site Scenario

Step 3 Click Next to continue.

Configuring the IKE Policy

IKE is a negotiation protocol that includes an encryption method to protect data
and ensure privacy; it is also an authentication method to ensure the identity of the
peers. In most cases, the ASDM default values are sufficient to establish secure
VPN tunnels between two peers.

In Step 3 of the VPN Wizard, perform the following steps:

Step 1 Click the Encryption (DES/3DES/AES), authentication algorithms (MD5/SHA),

and the Diffie-Hellman group (1/2/5) used by the adaptive security appliance
during an IKE security association.

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Note When configuring Security Appliance 2, enter the exact values for each

of the options that you chose for Security Appliance 1. Encryption
mismatches are a common cause of VPN tunnel failures and can slow
down the process.

Step 2 Click Next to continue.

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Configuring IPsec Encryption and Authentication Parameters

In Step 4 of the VPN Wizard, perform the following steps:

Step 1 Choose the Encryption algorithm (DES/3DES/AES) and authentication algorithm

(MD5/SHA) from the drop-down lists.

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Step 2 Click Next to continue.

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Specifying Hosts and Networks

Identify hosts and networks at the local site that are permitted to use this IPsec
tunnel to communicate with the remote-site peer. Add or remove hosts and
networks dynamically by clicking Add or Delete, respectively. In the current
scenario, traffic from Network A (10.10.10.0) is encrypted by Security
Appliance 1 and transmitted through the VPN tunnel.

In addition, identify hosts and networks at the remote site to be allowed to use this
IPsec tunnel to access local hosts and networks. Add or remove hosts and
networks dynamically by clicking Add or Delete respectively. In this scenario, for
Security Appliance 1, the remote network is Network B (10.20.20.0), so traffic
encrypted from this network is permitted through the tunnel.

In Step 5 of the VPN Wizard, perform the following steps:

Step 1 In the Source area, choose IP Address from the Type drop-down list.

Step 2 Enter the local IP address and netmask in the IP Address and Netmask fields.

Step 3 In the Destination area, choose IP Address from the Type drop-down list.

Step 4 Enter the IP address and Netmask for the remote host or network.

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Step 5 Click Next to continue.

Viewing VPN Attributes and Completing the Wizard

In Step 6 of the VPN Wizard, review the configuration list for the VPN tunnel you
just created. If you are satisfied with the configuration, click Finish to apply the
changes to the adaptive security appliance.

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If you want the configuration changes to be saved to the startup configuration so
that they are applied the next time the device starts, from the File menu, click
Save.

Alternatively, ASDM prompts you to save the configuration changes permanently
when you exit ASDM.

If you do not save the configuration changes, the old configuration takes effect the
next time the device starts.

This concludes the configuration process for Security Appliance 1.

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