ZyXEL p-660r-t1 v2 Manual Do Utilizador

P-660R-Tx v2 Series User’s Guide

Chapter 6 WAN Setup

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This chapter describes how to configure WAN settings.

A WAN (Wide Area Network) is an outside connection to another network or the Internet.

See 

 for more information on the fields in the WAN screens.

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 ZyXEL Device’s routes to the Internet. If any two of the 
default routes have the same metric, the ZyXEL Device uses the following pre-defined 
priorities:

• Normal route: designated by the ISP (see 

) 

• Traffic-redirect route (see 

• WAN-backup route, also called dial-backup (see 

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 ZyXEL Device tries the 
traffic-redirect route next. In the same manner, the ZyXEL Device 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).

Note: IP Policy Routing overrides the default routing behavior and takes priority over 

all of the routes mentioned above.