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In this scenario, we should have a mechanism to ensure that the second session should

follow the first session's path to avoid this kind of problem.

That's why we add this feature.

How does this feature work?

(1) PC sends a request to "Update Server" through "WAN1".

(2) "Update Server" will reply a file list to the PC, the download address of the fill will be

"File Server", at the same time "Update Server" will inform that there is a PC located at

"WAN1" IP address will get file from you.

(3) PC knows the file address and want to retrieve the file. ZyWALL finds that the PC

already created a session five seconds ago, the session went out through "WAN1". It will

route this new session by "WAN1".

Five seconds is a key point.

We will have a timeout value.

In this case, if we set the timeout value as "1 seconds". The device will not route the new

session to the same interface.

If we set the timeout value as "10 seconds", 5 seconds is not timeout. The device will route

the new session to the same interface.

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ZyXEL Communications ZYWALL 5 - V4.04 Guia do Utilizador Página 179