Http Redirect; Http Redirect, Firewall And Policy Route - ZyXEL Communications Unified Security Gateway ZyWALL 300 User Manual

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H A P T E R
This chapter shows you how to configure HTTP redirection on your ZyWALL.See
5.4.19 on page 121
17.1 HTTP Redirect Overview
HTTP redirect forwards the client's HTTP request (except HTTP traffic destined for the
ZyWALL) to a web proxy server.
17.1.1 Web Proxy Server
A proxy server helps client devices make indirect requests to access the Internet or outside
network resources/services. A proxy server can act as a firewall or an ALG (application layer
gateway) between the private network and the Internet or other networks. It also keeps hackers
from knowing internal IP addresses.
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.

17.2 HTTP Redirect, Firewall and Policy Route

With HTTP redirect, the relevant packet flow for HTTP traffic is:
1 Firewall
2 Application Patrol

3 HTTP Redirect

4 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.
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HTTP Redirect
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