ZyXEL Communications ZyWALL 2 Plus - Manual (Page 151)

ZyWALL 2 Plus User’s Guide
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H A P T E R
8
WAN Screens
This chapter describes how to configure WAN settings.
8.1 WAN Overview
• Use the Route screen to configure route priority for the ZyWALL.
• Use the WAN screen to configure the WAN port for Internet access on the ZyWALL.
• Use the Traffic Redirect screen to configure an alternative gateway.
• Use the Dial Backup screen to configure the backup WAN dial-up connection.
8.2 TCP/IP Priority (Metric)
The metric represents the "cost of transmission". A router determines the best route for
transmission by choosing a path with the lowest "cost". RIP routing uses hop count as the
measurement of cost, with a minimum of "1" for directly connected networks. The number
must be between "1" and "15"; a number greater than "15" means the link is down. The
smaller the number, the lower the "cost".
1 The metric sets the priority for the ZyWALL's routes to the Internet. Each route must
have a unique metric.
2 The priorities of the WAN port routes must always be higher than the dial-backup and
traffic redirect route priorities.
If the WAN port route has a metric of "1" and the traffic-redirect route has a metric of "2" and
dial-backup route has a metric of "3", then the WAN port route acts as the primary default
route. If the WAN port route fails to connect to the Internet, the ZyWALL tries the traffic-
redirect route next. In the same manner, the ZyWALL uses the dial-backup route if the traffic-
redirect route also fails.
The dial-backup or traffic redirect routes cannot take priority over the WAN routes.
8.3 WAN Route
Click NETWORK > WAN to open the Route screen. Use this screen to configure the
priorities of the ZyWALL’s routes and settings for Windows Networking traffic.