What You Need To Know About Trunks - ZyXEL Communications ZyWALL USG 300 User Manual

Chapter 11 Trunks

11.1.2 What You Need to Know About Trunks

• 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 through a single WAN
interface for a specified period of time. This is useful when a redirect server
forwards a user request for a file and informs the file server that a particular WAN
IP address is requesting the file. If the user's subsequent sessions came from a
different WAN IP address, the file server would deny the request. Here is an
example.
Figure 166 Link Sticking
ge2
LAN
LAN user A tries to download a file from server B on the Internet. The ZyWALL
1
uses ge2 to send the request to server B.
250
1
3
ge3
A
2
4
C
ZyWALL USG 300 User's Guide
B