ZyXEL Communications ZyXEL ZyAIR 100 - Manual (Page 97)

ZyWALL 10~100 Series Internet Security Gateway
WAN Screens 8-1
Chapter 8
WAN Screens
This chapter describes how to configure WAN settings. Dial-backup applies to the ZyWALL 100,
30W and 10W (see Table 1-1 Model Specific Features). The Route and Traffic Redirect screens do
not apply to the ZyWALL 10.
8.1 WAN Overview
See the Wizard Setup chapter for more information on the fields in the WAN screens.
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".
The metric sets the priority for the ZyWALL’s routes to the Internet. If any two of the default routes have the
same metric, the ZyWALL uses the following pre-defined priorities:
1. Normal
route: designated by the ISP (see section 8.5) or a static route (see the IP Static Route Setup
chapter)
2. Traffic-redirect route (see section 8.8)
3. Dial-backup route (see section 8.9)
For example, if the normal 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 normal route acts as the primary default route. If the normal 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.
If you want the dial-backup route to take first priority over the traffic-redirect route or even the normal route,
all you need to do is set the dial-backup route’s metric to "1" and the others to "2" (or greater).
8.3 Configuring Route
Click WAN to open the Route screen.