ZyXEL Communications ZYWALL 1050 - V2.00 EDITION 1 Uživatelská příručka stáhnout pdf (Strana 87)

Chapter 7 Trunks

ZyWALL (ZLD) CLI Reference Guide

7.6 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 14 Link Sticking

1 LAN user A tries to download a file from server B on the Internet. The ZyWALL 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 ZyWALL 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 ZyWALL 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.

LAN

WAN1

WAN2

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ZyXEL Communications ZYWALL 1050 - V2.00 EDITION 1 Uživatelská příručka Strana 87