Tcp/Ip Priority (Metric); Configuring General; Figure 46 Spillover Algorithm Example - ZyXEL Communications ZyWall 35 User Manual

ZyWALL 35 User's Guide
In the following example figure, the upper threshold of the primary WAN interface is set to
800K. The ZyWALL sends network traffic of new sessions that exceeds this limit to the
secondary WAN interface.

Figure 46 Spillover Algorithm Example

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
routes.

7.6 Configuring General

Click WAN to open the General screen.
130 Chapter 7 WAN Screens