Tcp/Ip Priority (Metric); General Wan - Zywall - ZyXEL Communications Vantage CNM User Manual

Vantage CNM User's Guide
The ZyWALL's NAT feature allows you to configure sets of rules for one WAN port and
separate sets of rules for the other WAN port.
You can select through which WAN port you want to send out traffic from UPnP-enabled
applications.
The ZyWALL's DDNS lets you select which WAN interface you want to use for each
individual domain name. The DDNS high availability feature lets you have the ZyWALL use
the other WAN interface for a domain name if the configured WAN interface's connection
goes down.
When configuring a VPN rule, you have the option of selecting one of the ZyWALL's domain
names in the My Address field.

8.3 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 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.

8.4 General WAN - ZyWALL

This section gives background and configuration information on the fields displayed in this
screen.
115 Chapter 8 Configuration > WAN