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Chapter 14 HTTP Redirect
ZyWALL 110/310/1100 Series User’s Guide
230
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, Firewall and Policy Route
With HTTP redirect, the relevant packet flow for HTTP traffic is:
1 Firewall
2 HTTP Redirect
3 Policy Route
Even if you set a policy route to the same incoming interface and service as a HTTP redirect rule,
the ZyWALL checks the HTTP redirect rules first and forwards HTTP traffic to a proxy server if
matched. You need to make sure there is no firewall rule(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 Figure 132 on page 229 work, make sure you have the
following settings.
For HTTP traffic between lan1 and dmz:
• a from LAN1 to DMZ firewall rule (default) to allow HTTP requests from lan1 to dmz. Responses
to this request are allowed automatically.
• 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 firewall rule (default) to allow HTTP requests from dmz to wan1. Responses
to these requests are allowed automatically.
• a policy route to forward HTTP traffic from proxy server A to the Internet.
14.2 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.