Tcp/Ip Priority (Metric); Configuring General; Figure 44 Spillover Algorithm Example - ZyXEL Communications ZyWall 70 User Manual

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7.5 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 ZyWALL's routes to the Internet. Each route must

have a unique metric.

2 The priorities of the WAN port routes must always be higher than the dial-backup and

traffic redirect route priorities.

For example, lets say that you have the WAN operation mode set to active/passive and the

WAN 1 route has a metric of "2", the WAN 2 route has a metric of "3", the traffic-redirect

route has a metric of "14" and the dial-backup route has a metric of "15". 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 ZyWALL tries the WAN 2 route next. If the WAN 2 route fails, the ZyWALL

tries the traffic-redirect route. In the same manner, the ZyWALL uses the dial-backup route if

the traffic-redirect route also fails.

The dial-backup or traffic redirect routes cannot take priority over the WAN 1 and WAN 2

Click WAN to open the General screen.

Chapter 7 WAN Screens

ZyWALL 70 User's Guide