Chapter 56 Troubleshooting

The ZyWALL routes and applies SNAT for traffic from some interfaces but not from others.

The ZyWALL automatically uses SNAT for traffic it routes from internal interfaces to external interfaces. For example LAN to WAN traffic. You must manually configure a policy route to add routing and SNAT settings for an interface with the Interface Type set to General. You can also configure a policy route to override the default routing and SNAT behavior for an interface with the Interface Type set to Internal or External.

The ZyWALL is not applying a policy route’s port triggering settings.

You also need to create a firewall rule to allow an incoming service.

I cannot get Dynamic DNS to work.

•You must have a public WAN IP address to use Dynamic DNS.

•Make sure you recorded your DDNS account’s user name, password, and domain name and have entered them properly in the ZyWALL.

•You may need to configure the DDNS entry’s IP Address setting to Auto if the interface has a dynamic IP address or there are one or more NAT routers between the ZyWALL and the DDNS server.

•The ZyWALL may not determine the proper IP address if there is an HTTP proxy server between the ZyWALL and the DDNS server.

I cannot create a second HTTP redirect rule for an incoming interface.

You can configure up to one HTTP redirect rule for each (incoming) interface.

I cannot get the application patrol to manage SIP traffic.

Make sure you have the SIP ALG enabled.

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ZyWALL USG 2000 User’s Guide