ZyXEL Communications ZyWall USG20-VPN, Руководство пользователя

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USG20(W)-VPN Series User’s Guide
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HTTP Redirect
13.1 Overview
HTTP redirect forwards the client’s HTTP request (except HTTP traffic destined for the USG) to a web
proxy server. In the following example, proxy server
A is connected to the DMZ interface. When a
client connected to the LAN1 zone wants to open a web page, its HTTP request is redirected to
proxy server A first. If proxy server A cannot find the web page in its cache, a policy route allows it
to access the Internet to get them from a server. Proxy server A then forwards the response to the
client.
Figure 173
HTTP Redirect Example
13.1.1 What You Can Do in this Chapter
Use the HTTP Redirect screens (see Section 13.2 on page 264 ) to display and edit the HTTP
redirect rules.
13.1.2 What You Need to Know
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 security policy 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.
LAN1