Tcp/Ip Priority (Metric); Wan General - ZyXEL Communications NBG410W3G User Manual

Chapter 6 WAN Screens

6.3 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 ZyXEL Device's routes to the Internet. Each route
must have a unique metric.
2 The priorities of the WAN interface routes must always be higher than the traffic redirect
route priorities.
Lets say that you have the WAN operation mode set to active/passive, meaning the ZyXEL
Device use the second highest priority WAN interface as a back up. The WAN 1 route has a
metric of "2", the WAN 2 route has a metric of "3", and the traffic-redirect route has a metric
of "14". In this case, the WAN 1 route acts as the primary default route. If the WAN 1 route
fails to connect to the Internet, the ZyXEL Device tries the WAN 2 route next. If the WAN 2
route fails, the ZyXEL Device tries the traffic-redirect route.
The traffic redirect route cannot take priority over the WAN 1 and WAN 2 routes.

6.4 WAN General

Click NETWORK > WAN to open the General screen. Use this screen to configure operation
mode, route priority and connection test.
WAN 2 refers to the 3G card on the supported ZyXEL Device.
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NBG410W3G Series User's Guide