Chapter 8 WAN Screens
ZyWALL 5/35/70 Series User’s Guide
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8.5 WAN Interface to Local Host Mapping Timeout
You can set the ZyWALL to send all of a local computer’s traffic through the same WAN
interface. 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 92 Incorrect WAN IP
1 LAN user A wants to download a file from a remote server on the Internet. The
ZyWALL is using active/active load balancing and sends the request to an update server
(B) through WAN 1.
2 Update server B sends a file list to LAN user A. The download address of the desired file
is a file server (C). At the same time, update server B informs file server C that a
computer located at the WAN 1’s IP address will download a file.
3 When LAN user A tries to retrieve the file from file server C, the request goes through
WAN 2.
4 File server C finds that the request comes from WAN 2’s IP address instead of WAN 1’s
IP address and rejects the request.
LAN
WAN 1
WAN 2
A
B
C
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