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Chapter 14 Trunks
ZyWALL USG 1000 User’s Guide
338
14.1.2 What You Need to Know
• Add WAN interfaces to trunks to have multiple connections share the traffic
load.
• 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 266 Link Sticking
1 LAN user A logs into server B on the Internet. The ZyWALL uses ge2 to send the
request to server B.
LAN
ge2
ge3
A
B
1
2
3