ZyXEL Communications Prestige 792H, User Manual

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Prestige 792H User’s Guide
WAN Setup 5-1
Chapter 5
WAN Setup
This chapter describes how to configure WAN settings.
5.1 WAN Overview
A WAN (Wide Area Network) is an outside connection to another network or the Internet.
See the Wizard Setup chapter for more information on the fields in the WAN screens.
5.2 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 Prestige’s routes to the Internet. If any two of the default routes have the
same metric, the Prestige uses the following pre-defined priorities:
1. Normal route: designated by the ISP (see section 5.5 )
2. Traffic-redirect route (see section 5.6 )
3. WAN-backup route, also called dial-backup (see section 5.6 )
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 Prestige tries the traffic-redirect route next. In the same manner,
the Prestige uses the dial-backup route if the traffic-redirect route also fails.