Chapter 7 Wan Screens; Wan Overview; Tcp/Ip Priority (Metric); Configuring Route - ZyXEL Communications ZyWALL 5 User Manual

7.1

WAN Overview

See the Wizard Setup chapter for more information on the fields in the WAN screens.
7.2

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 7.4) or a static route (see the IP Static Route
Setup chapter)
2. Traffic-redirect route (see section 7.6)
3. Dial-backup route (see section 7.7)
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).
7.3

Configuring Route

Click WAN to open the Route screen.
WAN Screens
ZyWALL 5 Internet Security Appliance
This chapter describes how to configure WAN settings.
Chapter 7
WAN Screens
7-1