ZyWALL/USG Series User’s Guide
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CHAPTER 14
Redirect Service
14.1 Overview
Redirect Service redirects HTTP and SMTP traffic.
14.1.1 HTTP Redirect
HTTP redirect forwards the client’s HTTP request (except HTTP traffic destined for the ZyWALL/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 274 HTTP Redirect Example
14.1.2 SMTP Redirect
SMTP redirect forwards the authenticated client’s SMTP message to a SMTP server, that handles all
outgoing e-mail messages. In the following example, SMTP server A is connected to the lan2
interface in the LAN2 zone. When a client connected to the lan1 interface in the LAN1 zone logs
into the ZyWALL/USG and wants to send an e-mail, its SMTP message is redirected to SMTP server
A. SMTP server A then sends it to a mail server, where the message will be delivered to the
recipient.
The ZyWALL/USG forwards SMTP traffic using TCP port 25.
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