Chapter 17 HTTP Redirect
UAG4100 User’s Guide
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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 UAG 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
work, make sure you have the
following settings.
For HTTP traffic between
lan1
and
lan2
:
• a from LAN1 to LAN2 firewall rule to allow HTTP requests from
lan1
to
lan2
. 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
lan2
and
wan1
:
• a from LAN2 to WAN firewall rule (default) to allow HTTP requests from
lan2
to
wan1
.
Responses to these requests are allowed automatically.
• a policy route to forward HTTP traffic from proxy server
A
to the Internet.
17.2 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.
