Chapter 14 Trunks
UAG CLI Reference Guide
109
14.6 Link Sticking
You can have the UAG 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 14 Link Sticking
1 LAN user A tries to download a file from server B on the Internet. The UAG uses WAN1 to send the
request to server B.
2 However remote server B is actually a redirect server. So server B sends a file list to LAN user A.
The file list lets LAN user A’s computer know that the desired file is actually on file server (C). At the
same time, register server B informs file server C that a computer located at the WAN1’s IP address
will download a file.
3 The UAG is using active/active load balancing. So when LAN user A tries to retrieve the file from file
server C, the request goes out through WAN2.
4 File server C finds that the request comes from WAN2’s IP address instead of WAN1’s IP address
and rejects the request.
5 If link sticking had been configured, the UAG would have still used WAN1 to send LAN user A’s
request to file server C and the file server would have given the file to A.
14.7 Link Sticking Commands Summary
The following table lists the ip load-balancing link-sticking commands for link sticking. (The
link sticking commands have the prefix ip load-balancing because they affect the UAG’s load
balancing behavior.) You must use the
configure terminal command to enter the configuration
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