What You Need To Know - ZyXEL Communications ZyWall USG 2000 User Manual

Unified security gateway

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Chapter 14 Trunks

14.1.2 What You Need to Know

• Add WAN interfaces to trunks to have multiple connections share the traffic

• If one WAN interface's connection goes down, the ZyWALL sends traffic through

another member of the trunk.

• For example, you connect one WAN interface to one ISP and connect a second

WAN interface to a second ISP. The ZyWALL balances the WAN traffic load

between the connections. If one interface's connection goes down, the ZyWALL

can automatically send its traffic through another interface.

You can also use trunks with policy routing to send specific traffic types through

the best WAN interface for that type of traffic.

• If that interface's connection goes down, the ZyWALL can still send its traffic

through another interface.

• You can define multiple trunks for the same physical interfaces.

Link Sticking

You can have the ZyWALL send each local computer's traffic that is going to the

same destination through a single WAN interface for a specified period of time.

This is useful when a server requires authentication. For example, the ZyWALL

sends a user's traffic through one WAN IP address when he logs into a server B. If

the user's subsequent sessions came from a different WAN IP address, the server

would deny them. Here is an example.

Figure 268 Link Sticking

LAN user A logs into server B on the Internet. The ZyWALL uses ge2 to send the

request to server B.

ZyWALL USG 2000 User's Guide