The Http Redirect Screen - ZyXEL Communications USG40 User Manual

A client connects to a web proxy server each time he/she wants to access the Internet. The web
proxy provides caching service to allow quick access and reduce network usage. The proxy checks
its local cache for the requested web resource first. If it is not found, the proxy gets it from the
specified server and forwards the response to the client.
HTTP Redirect, Security Policy and Policy Route
With HTTP redirect, the relevant packet flow for HTTP traffic is:
Security Policy
1
Application Patrol
2
HTTP Redirect
3
Policy Route
4
Even if you set a policy route to the same incoming interface and service as a HTTP redirect rule,
the ZyWALL/USG checks the HTTP redirect rules first and forwards HTTP traffic to a proxy server if
matched. You need to make sure there is no security policy(s) blocking the HTTP requests from the
client to the proxy server.
You also need to manually configure a policy route to forward the HTTP traffic from the proxy server
to the Internet. To make the example in
following settings.
For HTTP traffic between lan1 and dmz:
• a from LAN1 to DMZ security policy (default) to allow HTTP requests from lan1 to dmz.
Responses to this request are allowed automatically.
• a application patrol rule to allow HTTP traffic between lan1 and dmz.
• a HTTP redirect rule to forward HTTP traffic from lan1 to proxy server A.
For HTTP traffic between dmz and wan1:
• a from DMZ to WAN security policy (default) to allow HTTP requests from dmz to wan1.
Responses to these requests are allowed automatically.
• a application patrol rule to allow HTTP traffic between dmz and wan1.
• a policy route to forward HTTP traffic from proxy server A to the Internet.

12.2 The HTTP Redirect Screen

To configure redirection of a HTTP request to a proxy server, click Configuration > Network >
HTTP Redirect. This screen displays the summary of the HTTP redirect rules.
Note: You can configure up to one HTTP redirect rule for each (incoming) interface.
Chapter 12 HTTP Redirect
Figure 181 on page 270
ZyWALL/USG Series User's Guide
271
work, make sure you have the