Avaya Router - Virtual Private Networking BCM50 User Manual

BCM50 Rls 6.0

Router - Virtual Private Networking

Task Based Guide

Router – Virtual Private Networking

Notices

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Downloading documents

For the most current versions of documentation, see the Avaya Support. Web site: http://www.avaya.com/support

Contact Avaya Support

Avaya provides a telephone number for you to use to report problems or to ask questions about your product. The support telephone number is 1-800-242-2121 in the United States. For additional support telephone numbers, see

the Avaya Web site: http://www.avaya.com/support

be reproduced in any form without the prior written permission of a duly authorised representative of ITEL.

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Table of Contents

Virtual Private Networking Guide..................................... 6

Overview .......................................................................................... 6

BCM50 Integrated Router VPN Types ............................................. 6

Client VPN ......................................................................................................... 6

Branch VPN ....................................................................................................... 7

Client Termination .............................................................................................. 8

IPSec Algorithms ............................................................................. 8

Authentication Header (AH) Protocol................................................................. 9

Encapsulating Security Payload ........................................................................ 9

VPN and NAT ................................................................................ 10

VPN Branch IP Relationships ........................................................ 10

Content ID & Type ......................................................................... 11

Required Information ..................................................................... 12

Flowchart ....................................................................................... 12

Accessing the Web Router GUI ..................................................... 13

From Element Manager ................................................................................... 13

Access Directly via a Web Browser ................................................................. 18

VPN Configuration ......................................................................... 20

VPN & RIP ....................................................................................................... 20

Client Rule ..................................................................................... 20

Exclusive Mode for Client Rules ...................................................................... 24

Branch Rule ................................................................................... 25

Client Termination .......................................................................... 36

SA Monitor ..................................................................................... 43

Global Settings .............................................................................. 45

Additional Information .................................................... 47

Creating a tunnel between two BCMs ............................................ 47

Configuration on Switch A ............................................................................... 47

Configuration on Switch B ............................................................................... 49

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Routing Information Protocol (RIP) ................................................ 51

Avaya Documentation Links .......................................... 52

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Note: This guide relates to the BCM50a/ba and BCM50e/be models only.

Note: Although the BCM50a/ba models will not be supplied with BCM 6.0, it is

possible to upgrade the variants of these models to BCM 6.0, if they were originally supplied with BCM50 R2 or BCM50 R3 software.

Note: The BCM50 Integrated Router is almost identical to the Business Secure Router (BSR) models. BCM50a/ba routers are based on the BSR252 and BCM50e/be routers are based on the BSR222.

Virtual Private Networking Guide

Overview

BCM50 Integrated Router models can provide secure connection to other sites using the IP Sec protocol. For example, data can be sent between two BCM50 Integrated Router’s over the Internet. One usage of VPN’s would be to create VoIP (Voice over IP) gateways between geographically separated sites, so that the voice traffic can be securely transmitted.

BCM50 Integrated Router VPN Types

The BCM50 Integrated Router (also known as BCM50 Integrated Router) can provide three types of VPN connections:

 Client: The BCM50 Integrated Router acts as a client connecting to a

VPN router (e.g. Contivity switch or another BCM50 Integrate Router).

 Branch: The BCM50 Integrated Router can connect to multiple other

BCM50 Integrated Routers via secure connections.

 Client Termination: The BCM50 Integrated Router allows multiple

Contivity clients, e.g. Contivity software clients or BCM50 Integrated Routers configured in Client mode to connect securely.

Client VPN

With the BCM50 Integrated Router set up as a Client VPN, the BCM50 Integrated Router sets up a secure connection to a corporate network via a Contivity switch or another BCM50 Integrated Router. In this scenario, the BCM50 Integrated Router is the Client.

Note: If the BCM50 Integrated Router is configured with the VPN Client rule, it cannot have any other VPN configuration, i.e. the BCM50 Integrated Router can only VPN to one designated Contivity switch or main office BCM50 Integrated Router. The Contivity switch/main office BCM50 Integrated Router administrator provides the client BCM50 Integrated Router administrator with basic account details to connect to their network.

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Branch VPN

The BCM50 Integrated Router Branch VPN rules allow the configuration of up to 10 secure connections to other equivalent IPSec routers, e.g. another BCM50 Integrated Router, over the public network. VPN connections could be used for transferring information between PCs or setting up secure VoIP tunnels between handsets.

When configuring Branch rules, settings must be agreed upon before configuration can successfully take place. These settings include security details (IKE, VPN Protocol, Pre-Shared Key), and manually entered information such as WAN IP Addresses, Local/Remote IP Addresses, Content Type etc. The information must match on both the local and remote ends otherwise the connection will not be successfully made.

A worked example configuration is provided later in this guide.

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Client Termination

This configuration allows multiple remote users to connect to the BCM50 Integrated Router via Contivity client software running on a PC/laptop, or via another BCM50 Integrated Router (also BSR router) configured in Client VPN mode.

Mobile or home workers will find this feature useful for connecting to the main office network, for data transfer or VoIP purposes.

IPSec Algorithms

The IPSec standard defines a set of security protocols that authenticate IP connections and add confidentiality and integrity to IP packets. IPSec packets are transparent to applications and the underlying network infrastructure. IPSec supports various encryption and authentication protocols so that your security policy can dictate levels of data privacy and authentication. IPSec uses a flexible key management scheme called the Internet Security Association Key Management Protocol (ISAKMP), which enables peer connections to quickly and dynamically agree on compatible security and connection parameters (keys, encryption, and authentication).

There are two possible types of IPSec encryption algorithm on the BCM50: Authentication Header (AH), and Encapsulating Security Payload (ESP).

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Authentication Algorithm

Description

MD5 (Message Digest 5)

Produces a 128-bit digest to authenticate packet data.

SHA-1 (Secure Hash Algorithm)

Produces a 160-bit digest to authenticate packet data. For minimal security use MD5, or for maximum security use SHA-1.

Encryption Algorithm

Description

DES (Data Encryption Standard)

A widely used method of data encryption using a private (secret) key. DES applies a 56-bit key to each 64-bit block of data.

3DES (Triple DES)

A variant of DES, which iterates three times with three separate keys (3 x 56 = 168 bits), effectively doubling the strength of DES.

AES (Advanced Encryption Standard)

A newer method of data encryption that also uses a secret key. This implementation of AES applies a 128-bit key to 128-bit blocks of data. AES is faster than 3DES.

For minimal security use DES, or for maximum security use 3DES.

Authentication Header (AH) Protocol

In applications where confidentiality is not required, an AH can be employed to ensure integrity. This type of implementation does not protect the information from dissemination but will allow for verification of the integrity of the information and authentication of the originator.

AH Protocol Options

Encapsulating Security Payload

The ESP protocol provides encryption as well as some of the services offered by AH. ESP authenticating properties are limited compared to the AH due to the non-inclusion of the IP header information during the authentication process. However, ESP is sufficient if only the upper layer protocols need to be authenticated.

An added feature of the ESP is payload padding, which further protects communications by concealing the size of the packet being transmitted.

ESP Protocol Options

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VPN and NAT

Normally it is not possible to set up a VPN when there is a NAT Router in between two VPN switches. This is because the NAT Router changes the header of the outgoing IPSec packet so it does not match the header for which the receiving VPN switch is checking. Therefore, the receiving VPN switch does not respond and the tunnel cannot be built.

The BCM50 Integrated Router solves this problem by the use of NAT Traversal; an option that can be selected when configuring VPN Branch rules. Both VPN switches should have NAT Traversal enabled.

Note: For NAT Traversal to be successful, the VPN Branch rule should be configured to use the ESP algorithm and also to use tunnel mode.

VPN Branch IP Relationships

The configuration of VPN Branch rules requires the definition of both global (WAN IP address used on the Internet) and private (LAN IP addresses) IP Addresses. The reason for this is so that a path can be securely set up from one LAN to another, via WAN IP addresses used on the internet. The following diagram helps explain the relationship between these global and LAN IP addresses involved in VPN connections.

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Note: The Domain name and e-mail options do not have to actually exist and are purely referential.

Field

Switch A

Switch B

Local ID Type

E-mail

DNS

Content

Sys2@yahoo.com

www.iteluk.com

Peer ID Type

DNS

E-mail

Content

www.iteluk.com

Sys2@yahoo.com

The above diagram shows the information required for the VPN Branch setup from switch A’s perspective:

 “My” IP Address is the WAN IP address issued by the ISP (Internet

Service Provider) to switch A

 Secure Gateway Address is the WAN IP address issued by the ISP to

switch B

 Local IP Address Range is the range of IP Addresses used on the LAN

connected to switch A

 Remote IP Address Range is the range of IP Addresses used on the

LAN connected to switch B

If a PC on switch A requests information from a PC on switch B, switch A will initiate a VPN connection via switch B’s Secure gateway Address. Therefore, the two LANs can communicate via the global (WAN) IP addresses specified.

From switch B’s perspective, the set information is the same but the terminology is reversed, i.e. switch A’s “My” IP address becomes switch B’s Secure Gateway Address and switch A’s Local IP Address Range becomes switch B’s Remote IP Address Range etc.

Content ID & Type

Content ID and Type are extra security features that act as extra levels of security for incoming VPN requests. They do not replace any of the possible encryption methods (ESP, AH).

The options for type are:

 IP – IP address of a computer or BCM50 Integrated Router router  Domain (DNS) – A designated domain name  E-mail – A designated e-mail address

When using this feature, both local and remote (peer) Content ID and Type will have to be specified and mirrored for either end of the VPN connection.

For example, referring back to the diagram in the VPN Branch Relationships section, the Content ID and Type fields on switches A and B could be as follows:

This information has to be agreed by the BCM switch administrators of both BCM50 Integrated Router switches.

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A single connection to a Contivity switch or another BCM50 Integrated Router

Which type of VPN do you need to configure for the BCM50 Integrated Router?

Refer to the Client Rule section of this guide.

Refer to the Branch Rule section of this guide.

Refer to the Client Termination section of this guide.

Client Termination for remote users using Contivity Client software or a 1100 series IP phone

Multiple VPN connections to other BCM50 Integrated

Check that the VPN connections are successfully connected: Refer to the SA Monitor section of this guide.

Do you want to set up exclusive access for just one device to use the VPN connection?

Refer to the

Exclusive Mode for Client Rules section

of this guide.

Yes

Required Information

Before configuring IPSec, the following information is required:

 What is the required level of encryption to be used?  What is the password to be used for the Pre-shared key?  What Content ID and Type will be used?  What are the WAN IP addresses of the local and remote BCM50

Integrated Router’s?

 What are the LAN IP addresses of the local and remote LANs?

Flowchart

The flow chart below shows which sections of the guide you should use when configuring VPN connections.

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Accessing the Web Router GUI

There are two methods of accessing the Web Router GUI, independent on which model you are configuring:

 Via Element Manager (management application for all BCM50 models)  Directly from a web browser

From Element Manager

1. To access the Business Element Manager application from the Start Menu, navigate to Start, Programs, Avaya, Business Communications Manager, Business Element Manager.

2. Alternatively, double-click on the Business Element Manager desktop icon.

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3. You will be presented with the Element Manager interface.

4. Open the Network Elements folder and select the IP Address of the BCM.

5. Enter the User Name of the BCM in the User Name field, by default this is nnadmin. Then enter the Password in the Password field, by default the password is PlsChgMe!. Click the Connect button.

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6. A warning screen will appear, read the warning and click OK.

7. You will be presented with the Element Manager interface.

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Note: if the above logon details do not work, try Username = admin, and Password = setup.

8. Click the Data Services link, select the Router link and click the Launch Router Web GUI Tool button.

9. The Business Secure Router logon screen will be displayed. Enter the Username (default = nnadmin) and Password (default = PlsChgMe!) and click Login.

10. Change the password and click Apply, or click Ignore to continue.

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