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
LAN
WAN1
WAN2
A
B
C
1
2
3
4
Summary of Contents for UAG Series
Page 5: ...Document Conventions UAG CLI Reference Guide 5 Server Firewall Telephone Switch Router ...
Page 22: ...22 PART I Introduction ...
Page 23: ...23 ...
Page 41: ...41 PART II Reference ...
Page 42: ...42 ...