ZyXEL Communications ZyWALL 2WG User Manual

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ZyWALL 2WG

Security Appliance

Support Notes

Version 4.03

Sep. 2007

ZyWALL 2WG Support Notes

INDEX

Application Notes......................................................................................................9

Mobility Internet Access........................................................................................9

Utilize 3G and Wireless for the Internet Access......................................10

Seamless Incorporation into your network..........................................................18

Using Transparent (Bridge Mode) Firewall ............................................18

Internet Connection...................................................................................24

DHCP server/client/relay...........................................................................25

Using NAT/Multi-NAT ..............................................................................26

Optimize network performance & availability....................................................35

Using Bandwidth Management ................................................................35

Secure Connections across the Internet...............................................................43

Site-to-Site VPN (Intranet) Scenario........................................................43

Configure ZyWALLs with Static WAN IP Address.............................43

Configure ZyWALL with Dynamic WAN IP Address.........................44

Configure ZyWALL behind NAT Router ............................................46

Mapping multiple Network policy to same gateway policy................48

Using Certificate for Device Authentication........................................53

Using Self-signed Certificates .....................................................54

Online Enroll Certificates............................................................57

Offline Enroll Certificates............................................................66

Using Pre-Shared Key for Device Authentication...............................99

Using VPN routing between branches...............................................100

NAT over IPSec on ZyNOS...............................................................110

Never lost your VPN connection (IPSec High Availability)..............119 Access control and security VPN connection (Security policy

enforcement IPSec)............................................................................123

How to configure access control rule over VPN .......................123

How to configure Web filtering rule over VPN – Content Filter128

ZyWALL vs 3rd Party VPN Gateway....................................................130

SonicWALL with ZyWALL VPN Tunneling.............................130

NetScreen with ZyWALL VPN Tunneling................................139

Check Point with ZyWALL VPN Tunneling ............................151

FortiNet with ZyWALL VPN Tunneling ...................................185

Remote Access VPN Scenario .................................................................198

Using xAuth for User Authentication................................................198

ZyXEL VPN Client to ZyWALL Tunneling......................................200

Content Filter Application..................................................................................209

ZyWALL 2WG Support Notes

To filter non-work related and unproductive web surfing to mitigate

spyware and phishing threats.................................................................209

Centralized Management...................................................................................216

Using Vantage CNM for Management...................................................216

FAQ ...........................................................................................................................221

A. Product FAQ .................................................................................................221

A01. What is the ZyWALL Internet Access Sharing Router? .............221

A02. Will the ZyWALL work with my Internet connection?...............222

A03. What do I need to use the ZyWALL?............................................222

A04. What is PPPoE? ..............................................................................222

A05. Does the ZyWALL support PPPoE?..............................................222

A06. How do I know I am using PPPoE? ..............................................222

A07. Why does my Internet Service Provider use PPPoE?..................222

A08. How can I configure the ZyWALL? ..............................................223

A09. What can we do with ZyWALL? ...................................................223

A10. Does ZyWALL support dynamic IP addressing?.........................223 A11. What is the difference between the internal IP and the real IP

from my ISP?............................................................................................223

A12. How does e-mail work through the ZyWALL?............................223 A13. Is it possible to access a server running behind NAT from the

outside Internet? If possible, how?.........................................................223

A14. What DHCP capability does the ZyWALL support?...................224 A15. How do I used the reset button, more over what field of parameter will be reset by reset button?

................................................224 A16. What network interface does the new ZyWALL series support?224

A17. How does the ZyWALL support TFTP?.......................................224

A18. Can the ZyWALL support TFTP over WAN?..............................224 A19. How can I upload data to outside Internet over the one-way

cable?.........................................................................................................224 A20. My ZyWALL can not get an IP address from the ISP to connect

to the Internet, what can I do?................................................................225

A21. What is BOOTP/DHCP?................................................................225

A22. What is DDNS?................................................................................225

A23. When do I need DDNS service?.....................................................226

A24. What DDNS servers does the ZyWALL support?........................226

A25. What is DDNS wildcard? ...............................................................226

A26. Does the ZyWALL support DDNS wildcard?...............................226 A27. Can the ZyWALL NAT handle IPSec packets sent by the VPN

ZyWALL 2WG Support Notes

gateway behind ZyWALL? .....................................................................226 A28. How do I setup my ZyWALL for routing IPSec packets over

NAT? .........................................................................................................227

A29. What is STP (Spanning Tree Protocol) /RSTP (Rapid STP)?.....227 A30. What is the flow ZyWALL handles inbound and outgoing

traffic?.......................................................................................................227

B. Firewall FAQ.................................................................................................227

B01. What is a network firewall?...........................................................228

B02. What makes ZyWALL secure?......................................................228

B03. What are the basic types of firewalls?...........................................228

B04. What kind of firewall is the ZyWALL?........................................229 B05. Why do you need a firewall when your router has packet

filtering and NAT built-in?.....................................................................229

B06. What is Denials of Service (DoS)attack?.......................................229

B07. What is Ping of Death attack?........................................................230

B08. What is Teardrop attack?...............................................................230

B09. What is SYN Flood attack?............................................................230

B10. What is LAND attack?....................................................................230

B11. What is Brute-force attack?...........................................................230

B12. What is IP Spoofing attack?...........................................................231

B13. What are the default ACL firewall rules in ZyWALL?..............231 B14. Why does traffic redirect/static/policy route be blocked by

ZyWALL?.................................................................................................231

B15. How can I protect against IP spoofing attacks?...........................233

C. Security Service licenses FAQ ......................................................................234

C01. What is iCard? ................................................................................234

C02. Where can I buy the iCard and how much does it cost?.............234

C03. How many kinds of iCard does ZyXEL provide?........................234

C04. Is each type of iCard device specific?............................................234 C05. What are the available security service licenses which require

additional purchase and license activation in ZyNOS v4.00?..............234

C06. What kind of iCard should I buy?.................................................235 C07. If I violate the mappings described above, for example, using a silver iCard for ZyWALL 35 or ZyWALL 70, what will happen?

.......235 C08. Can I try the Content Filtering service for free? How long is the free trial period of Content Filtering service?

.......................................235

D. Security Service Activation and UpdateFAQ................................................235

D01. Why do I have to register?.............................................................235

ZyWALL 2WG Support Notes

D02. In addition to registration, what can I do with myZyXEL.com?235 D03. Is there anything changed on myZyXEL.com because of the launch of ZyNOS v4.00? Which ZyWALL models can be registered

via myZyXEL.com?.................................................................................236 D04. What’s the difference between new registration flow and previous registration? What’s the advantage of new registration flow

over the previous registration flow?.......................................................236 D05. If I were new to myZyXEL.com, what are the required fields

when I register my ZyWALL device on myZyXEL.com?....................237 D06. When using the new registration flow of myZyXEL.com for ZyNOS v4.0, do I have to create a new account if I were already a

registered user on myZyXEL.com?........................................................237

D07. What is mySecurityZone? ..............................................................237

D08. What is Update Server?..................................................................237

D09. Who maintains mySecurityZone & Update Server? ...................238

D10. What’s the URL for these service portals? ...................................238

E. Content Filter FAQ........................................................................................238

E01. What's the operation between ZyXEL appliance and BlueCoat

data center?..............................................................................................238 E02. How many entries can the cache of Web Site Auto Categorization

keep at most?............................................................................................238 E03. Can I specify the time out value of the query response from

BlueCoat data center? .............................................................................238 E04. Can I decide whether to forward or drop the HTTP response if

the query to BlueCoat data center is timed out?...................................239

E05. How to register for BlueCoat service?...........................................239

E06. Why can't I make registration successfully?................................239

E07. What services can I get with Trial Registration? .........................239

E08. What types of content filter does ZyWALL provide?..................239 E09. What are the primary features of ZyXEL Content Filtering?....239 E10. Who needs ZyXEL Content Filtering? Is ZyXEL Content

Filtering for small companies or for large corporations? ....................240 E11. Can I have different policies in effect for different times of the day or week?

.............................................................................................240

E12. How many policies can I create?....................................................240

E13. Can I create my own categories?...................................................240 E14. Can I override (block or allow) certain URLs regardless of the

rating?.......................................................................................................240

ZyWALL 2WG Support Notes

E15. How many URL keywords does ZyWALL support?....................240 E16. How do I keep database of Content Filtering service updated?.241

E17. What is BlueCoat Filter list?..........................................................241

E18. How many ratings does the BlueCoat database contain?............241

E19. How often does BlueCoat update the database? ..........................241

E20. How do I locate sites to block?.......................................................241

E21. Do humans review the ratings?......................................................242

E22. How can I do if I find a WEB site is mis-categorized?.................242

E23. How many and what categories do you provide?.........................242 E24. How does the ZyXEL content filtering handle dynamically

generated sites?........................................................................................244 E25. Does BlueCoat have more than one data center? Is the BlueCoat

Web Filter geographically load balanced? ............................................244

E26. Who can generate and view reports on BlueCoat WEB site?.....244

E27. How can I get Content Filtering report?.......................................244

E28. Can I change the password for BlueCoat service?.......................244 E29. Which User Name & Password should I input for Content

Filtering report?.......................................................................................245 E30. My device can't get connected to Http://myZyXEL.com, so I

can't get into Registration page. What should I check?.......................245

F. IPSec FAQ......................................................................................................245

F01. How to count my VPN tunnels on ZyWALL?...............................245

F02. What is VPN?...................................................................................246

F03. Why do I need VPN?.......................................................................246

F04. What are most common VPN protocols? ......................................247

F05. What is PPTP?.................................................................................247

F06. What is L2TP?.................................................................................247

F07. What is IPSec?.................................................................................247

F08. What is SA?......................................................................................248

F09. What is Pre-Shared Key?................................................................248

F10. What is Phase 1 ID for?..................................................................248

F11. What are Local ID and Peer ID?....................................................249

F12. Is my ZyWALL ready for IPSec VPN?..........................................249

F13. How do I configure ZyWALL VPN?..............................................249

F14. What VPN protocols are supported by ZyWALL? ......................250

F15. What types of encryption does ZyWALL VPN support?.............250

F16. What types of authentication does ZyWALL VPN support?......250 F17. I am planning my ZyWALL-to-ZyWALL VPN configuration.

ZyWALL 2WG Support Notes

What do I need to know?.........................................................................250

F18. Does ZyWALL support dynamic secure gateway IP?..................251 F19. What VPN gateway that has been tested with ZyWALL

successfully?..............................................................................................251 F20. What VPN software that has been tested with ZyWALL

successfully?..............................................................................................251

F21. Will ZyXEL support Secure Remote Management?....................252

F22. Does ZyWALL VPN support NetBIOS broadcast?......................252

F23. Is the host behind NAT allowed to use IPSec?..............................252 F24. How do I configure ZyWALL with NAT for internal servers? ...252 F25. I am planning my ZyWALL behind a NAT router. What do I

need to know?...........................................................................................252

F26. Where can I configure Phase 1 ID in ZyWALL?..........................253

F27. How can I keep a tunnel alive?.......................................................253 F28. Single, Range, Subnet, which types of IP address does ZyWALL

support in VPN/IPSec?............................................................................254

F29. Does ZyWALL support IPSec pass-through?...............................254 F30. Can ZyWALL behave as a NAT router supporting IPSec pass

through and an IPSec gateway simultaneously?...................................254

G. PKI FAQ ........................................................................................................254

G01. Basic Cryptography concept..........................................................254

G02. What is PKI?...................................................................................255

G03. What are the security services PKI provides?..............................255

G04. What are the main elements of a PKI?.........................................255

G05. What is a Certification Authority?................................................256

G06. What is a digital certificate?..........................................................256 G07. What are public and private keys, and what is their

relationship?.............................................................................................256

G08. What are Certificate Policies (CPs)?.............................................256

G09. How does a PKI ensure data confidentiality?..............................257

G10. What is a digital signature?...........................................................257

G11. How does a digital signature work? ..............................................257

G12. Does ZyXEL provide CA service?.................................................259 G13. What if customers don't have access to CA service, but would

like to use PKI function?.........................................................................259 G14. How can I have Self-signed certificate for ZyXEL appliance?...259 G15. Can I create self-signed certificates in addition to the default

one?............................................................................................................259

ZyWALL 2WG Support Notes

G16. Will Self-signed certificate be erased if I reset to default

configuration file?....................................................................................259 G17. Will certificates stored in ZyXEL appliance be erased if I reset to

default configuration file?.......................................................................259

G18. What can I do prior to reset appliance's configuration?.............259 G19. If I export My Certificates from ZyXEL appliance, save them locally, and then import them back after resetting the configuration

file, can I reuse the imported My Certificates ?....................................260

H. Wireless FAQ................................................................................................260

H01. What are the capability of wireless feature of ZyWALL? ..........260

H02. What is the coverage range of Wireless in ZyWALL? ................260

H03. What is a Wireless LAN? ...............................................................260

H04. What are the advantages of Wireless LANs?...............................260

H05. What is IEEE 802.11.......................................................................261

H06. What is 802.11b? .............................................................................261

H07. What is 802.11g? .............................................................................261

H08. What is 802.11a? .............................................................................262

H09. What is Wi-Fi? ................................................................................262

H10. What types of devices use the 2.4 GHz Band? .............................262

H11. Can wireless signals pass through walls?......................................262 H12. What are the potential factors that may causes interference

among WLAN products?.........................................................................262

H13. What is SSID (Sever Set ID)? ........................................................263

H14. What is WEP? .................................................................................263

H15. What is a WEP key? .......................................................................263 H16. By turning off the broadcast of SSID, can someone still sniff the SSID?

.........................................................................................................263

H17. What is 802.1x?...............................................................................264 H18. Can I use WiFi access when I plug a 3G wireless card in the

PCMCIA slot ? .........................................................................................264

ZyWALL 2WG Support Notes

Application Notes

Mobility Internet Access

You may have the experienced a need of Internet access in a location where wired connection is difficult to deploy, e.g. in countryside or mountain. Or you are just in a public environment without Internet access, like in a park, on a bus, in a train or metropolitan subway, etc… Or you may temporarily need Internet access when you are in your exhibition booth and need Internet access for some demonstration. ZyWALL 2WG is especially designed for the mobility Internet access; it is light to carry everywhere and can utilize a 3G card for dial up to get the Internet access. Besides, you could utilize the embedded wireless card to provide wireless access for your LAN users.

Not only the mobility, you could also use ZyWALL 2WG as your WAN backup in the small office or SOHO. You could further choose a certain load balancing mechanism to perform dual WAN access.

In summery, you could utilize the 3G wireless access for your primary WAN, or backup WAN, or work with your primary WAN(Ethernet or PPP) together as a dual WAN application.

ZyWALL 2WG Support Notes

Utilize 3G and Wireless for the Internet Access

Following we will show you how to configure it step-by-step.

Utilize 3G card to get Internet access

1). Plug the 3G card to ZyWALL 2WG's card slot before powering on the ZyWALL 2WG device.

2). Login the GUI. After the system boots up, you can see the 3G card information on the home page. Make

sure there is no "Error" message in "3G Card IMEI" and "SIM Card IMSI" fields. Otherwise, you need to

re-install the 3G card and the SIM card and make sure they are properly installed. Please refer to the quick start

guide if you need to troubleshoot because of an error message.

3) Switch to GUI menu Network > WAN2 tab. Configure the APN, username, password, PIN code, phone

number, the authentication type and other settings you have got from your service provider. Click the Apply

button.

ZyWALL 2WG Support Notes

3). Then the 3G wireless card will be dialed up automatically when WAN1 is not available. If you check the

"Nailed-up" option as shown in the figure above, the system will automatically dial up the 3G Internet access

even if WAN1 is available. Then you will see the process in logs as following.

ZyWALL 2WG Support Notes

4) If dialed up successfully, you can see the GUI home page as shown below. You will get the "WAN2

connection is up" and "3G card's signal strength" messages in the latest alerts.

ZyWALL 2WG Support Notes

Utilize the embedded wireless card to provide LAN users access

1). Go to GUI menu Network > WIRELESS CARD, enable it and configure the other parameters like 802.11

mode (four modes available: 802.11b only, 802.11g only, 802.11b+g, 802.11a only), channel ID, super mode,

RTS/CTS, fragmentation, output power(four options: 100%, 50%, 25%, 12.5%) and roaming.

ZyWALL 2WG allows you to configure up to 8 SSID profiles. Choose the SSID profile you want to use and

click Apply button.

Note: You can modify the SSID profile by clicking the modify ( ) icon in the figure above: here you can

configure the SSID information and choose the security and the MAC filtering.

ZyWALL 2WG Support Notes

To configure the security and the MAC filter, go to Wireless Card > Security or Wireless Card > MAC Filter to

further configure it.

For example, we would like to provide the wireless access clients with preset MAC address filtering list.

Furthermore, these clients will also have to pass the security control described below.

a. Wireless security level to "WPA-PSK"with key "12345678". b. Only allow the PC's with MAC of "00:A0:C5:11:22:33", "00:A0:C5:11:22:44", and

"00:A0:C5:11:22:55" are allowed to associate the wireless network.

ZyWALL 2WG Support Notes

After you have configured the Security and MAC filter profiles, you can choose them in the main page

of wireless card setting as shown

ZyWALL 2WG Support Notes

Seamless Incorporation into your network

Using Transparent (Bridge Mode) Firewall

If user wants to insert a firewall into current network, IP setting of hosts and servers may need to change.

Following example illustrates an example of current deployment: servers and other hosts sit in the same IP

segment.

If a router mode firewall is inserted into existing network, user may need to reassign the IP of all servers and hosts and related setting of applications. However, it may be a huge task to admi nistrators.

ZyWALL 2WG Support Notes

Deploying a transparent mode firewall doesn’t require any changes of settings on the original network topology. It works as bridge/switch; therefore, all the hosts can communicate with each other as without firewall in between. At the same time, the transparent firewall can check the packets passing through it and block attacks and limit unauthorized access through access control right.

In the following section, we will explain how to configure ZyWALL as bridge firewall. Therefore, all hosts and servers can keep using the same IP as that of current network.

ZyWALL 2WG Support Notes

User can configure ZyWALL to act as a router mode firewall or bridge (transparent) firewall. The default is router mode firewall.

Step1. Before changing ZyWALL to bridge mode, if admin wants to make the ZyWALL’s LAN PC be able to get DHCP IP address assignment from the DHCP server or the gateway upper than the ZyWALL, there is one firewall rule needs to be activated.

Go to Firewall >> Rule Summary; choose ‘WAN to LAN’ from ‘Packet Direction’. You will see a rule to permit the service type, ‘BOOTP_CLIENT(UDP:68)’, to pass firewall. It’s INACTIVE by default. Admin can activate the rule by clicking the ‘N’ as following picture. Then the rule will be activated right away.

Step2. To change the device mode, go to MAINTENANCE >> Device Mode. Select ‘Bridge’ and

ZyWALL 2WG Support Notes

assign a management IP for ZyWALL. The Gateway IP Address is used as next-hop of default route. ZyWALL will restart after applying the change.

(Note: Here we suggest admin to dedicate an IP address to ZyWALL itself at the same subnet as original one (like 210.242.82.X/24 in this example). In this way, admin doesn’t need to change his PC’s IP address when he wants to access Internet and ZyWALL’s web GUI at the same time.)

ZyWALL 2WG Support Notes

Step3. After rebooting, login ZyWALL’s GUI by accessing ZyWALL’s management IP address. (Accessing ZyWALL by the PC with a static IP address configured in the same subnet or with an IP from DHCP server (refer to step1 for the pre-configured firewall rule).

Step4. In this example, since we want to apply a DMZ zone for servers. So for ZyWALL 2 Plus which the ports of LAN & DMZ can be configured, user can decide the roles of each port.

Go to Network >> LAN (or DMZ or WLAN) >> Port Roles. By default, 4 ports are assigned to LAN. In this example, we use port 1 & 2 assigned to LAN and Port 3 & 4 assigned to DMZ as following picture.

Step5. Furthermore, to configure firewall rule to control the access of your network, go to SECURITY >> FIREWALL as you do in router mode firewall. For example, user wants to block the access from a FTP server (210.242.82.2) in DMZ zone to LAN hosts (210.242.82.31~34) (Note that they all sits in the same IP segment 210.242.82.0/24). Edit the firewall rule via Firewall >> Rule Summary and with packet direction: DMZ to LAN.

And enter 210.242.82.2 as the source address and 210.242.82.31~34 as destination address. And then select the service and set the action for ‘Matched Packet’ to ‘BLOCK’.

ZyWALL 2WG Support Notes

Internet Connection

A typical Internet access application of the ZyWALL is shown below. This section guides you how to configure ZyWALL to gain the Internet access.

ZyWALL

Internet

LAN

WAN

Step1. First of all, Select Home menu and click Internet Access Wizard to configure your WAN connection. Click “Internet Access” under Home >> Wizards for Internet Access Quick Setup

A pop-up window as below will indicate you to enter ISP Parameters for Internet Access .

There are three kinds of encapsulation which are supported by ZyWALL: Ethernet, PPPoE & PPTP. Select the correct encapsulation type from the drop-down menu. The wizards will requests related information needed. These fields vary depending on what you select in the Encapsulation field. Fill them in with the information exactly as given by the ISP or network administrator.

ZyWALL 2WG Support Notes

Following picture is an example while PPPoE is selected.

Once the required information is correctly configured, click on the “Finish” button to apply the setting and then you have finished configuring Internet Access on WAN link.

DHCP server/client/relay

ZyWALL supports

(1) DHCP client on the WAN port

User can choose either a static IP or a dynamic IP address for WAN port. When choosing dynamic IP,

ZyWALL will get a DHCP IP address from ISP or upper layer DHCP server.

(2) DHCP server/relay/none on the LAN ports

ZyWALL supports DHCP server for LAN ports, but also

1. When choosing DHCP setting as ‘None’, the LAN will NOT assign IP address to the associated hosts. Client PCs need to configure IP address manually.

ZyWALL 2WG Support Notes

2. When choosing DHCP setting as a ‘Server’, the LAN will automatically assign IP, subnet, gateway and DNS to the associated clients.

3. When choosing DHCP setting as a ‘Relay’, the LAN will forward the DHCP request to another DHCP server.

Using NAT/Multi-NAT

• What is Multi-NAT?

• How NAT works

• NAT Mapping Types

• SUA versus Multi-NAT

• Example

Step 1. Applying NAT on WAN Interface Step 2. Configuring NAT Address Mapping Step 3. Using Multiple Global IP addresses for clients and servers (One-to-One, Many-to-One, Server Set mapping types)

• Application -- Non NAT-Friendly Support

• What is Multi-NAT?

NAT (Network Address Translation-NAT RFC 1631) is the translation of an Internet Protocol address used

within one network to a different IP address known within another network. One network is designated the

inside

network and the other is the

outside

. Typically, a company maps its local inside network addresses to one

or more global outside IP addresses and "unmaps" the global IP addresses on incoming packets back into local

IP addresses. The IP addresses for the NAT can be either fixed or dynamically assigned by the ISP. In addition,

you can designate servers, e.g., a web server and a telnet server, on your local network and make them

accessible to the outside world. If you do not define any servers, NAT offers the additional benefit of firewall

protection. In such case, all incoming connections to your network will be filtered out by the ZyWALL, thus

preventing intruders from probing your network.

The SUA feature that the ZyWALL supports previously operates by mapping the private IP addresses to a

global IP address. It is only one subset of the NAT. The ZyWALL supports the most of the features of the NAT

based on RFC 1631, and we call this feature as 'Multi-NAT'. For more information on IP address translation,

please refer to RFC 1631,

The IP Network Address Translator (NAT)

ZyWALL 2WG Support Notes

• How NAT works

If we define the local IP addresses as the Internal Local Addresses (ILA) and the global IP addresses as the

Inside Global Address (IGA), see the following figure. The term 'inside' refers to the set of networks that are

subject to translation. NAT operates by mapping the ILA to the IGA required for communication with hosts on

other networks. It replaces the original IP source address (and TCP or UDP source port numbers) and then

forwards each packet to the Internet ISP, thus making them appear as if they had come from the NAT system

itself (e.g., the ZyWALL router). The ZyWALL keeps track of the original addresses and port numbers so

incoming reply packets can have their original values restored.

• NAT Mapping Types

NAT supports five types of IP/port mapping. They are:

1. One to One

In One-to-One mode, the ZyWALL maps one ILA to one IGA.

2. Many to One

In Many-to-One mode, the ZyWALL maps multiple ILA to one IGA. This is equivalent to SUA (i.e., PAT, port address translation), ZyXEL's Single User Account feature that previous ZyNOS routers supported (the SUA only option in today's routers).

3. Many to Many Overload

In Many-to-Many Overload mode, the ZyWALL maps the multiple ILA to shared IGA.

4. Many One to One

In Many One to One, the ZyWALL maps each ILA to unique IGA.

ZyWALL 2WG Support Notes

5. Server

In Server mode, the ZyWALL maps multiple inside servers to one global IP address. This allows us to specify multiple servers of different types behind the NAT for outside access. Note, if you want to map each server to one unique IGA please use the One-to-One mode.

The following table summarizes these types.

NA T Type IP Mapping

One-to-One ILA1<--->IGA1

Many-to-One (SUA/PAT)

Many-to-Many Overload

Many One-to-One

Server

ILA1<--->IGA1 ILA2<--->IGA1 ...

ILA1<--->IGA1 ILA2<--->IGA2 ILA3<--->IGA1 ILA4<--->IGA2 ...

ILA1<--->IGA1 ILA2<--->IGA2 ILA3<--->IGA3 ILA4<--->IGA4 ...

Server 1 IP<--->IGA1 Server 2 IP<--->IGA1

• SUA Versus Multi-NAT

SUA (Single User Account), if you get only one public IP address from your ISP, then you should use SUA.

With SUA, PCs on ZyWALL's LAN side can access Internet without further configuration. If you have internal

servers to be accessed by remote users on Internet, you need to go to ADVANCED -> SUA/NAT -> SUA

Server to setup which service, or port numbers, you would like to forward to which Internal server.

Multi-NAT, if you get multiple public IP addresses from your ISP, then you may use Multi-NAT. With

Multi-NAT, you can choose different types of NAT mapping methods to utilize the public IP addresses. You

should define each NAT mapping rules clearly in ADVANCED -> SUA/NAT -> Address Mapping, so that

internal PCs can access Internet and internal servers can be accessed by remote uses on Internet.

ZyWALL 2WG Support Notes

Step 1. Applying NAT in WAN Interface

You can choose the NAT mapping types to either SUA Only or Full Feature in WAN setup.

NETWORK -> WAN

or ADVANCED -> NAT -> NAT Overview

ZyWALL 2WG Support Notes

Key Settings

Field Options Description

Full Feature

Set to 'Full Feature' if there are multiple IP addresses given by ISP and can assigned to your clients.

Set to 'Routring' if you clients use Internet IP

Network Address Translation

Routing

addresses and thus do not need NAT function. Set this field to 'SUA Only' if you want all clients

SUA Only

share one IP to Internet.

Step 2. Configuring NAT Address Mapping

To configure NAT, go to ADVANCED -> NAT -> Address Mapping

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