ZyWALL ATP Series User’s Guide
340
C
HAPTER
13
Redirect Service
13.1 Overview
Redirect Service redirects HTTP and SMTP traffic.
13.1.1 HTTP Redirect
HTTP redirect forwards the client’s HTTP request (except HTTP traffic destined for the Zyxel Device) 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 232
HTTP Redirect Example
13.1.2 SMTP Redirect
SMTP redirect forwards the authenticated client’s SMTP message to a SMTP server, that handles all
outgoing email 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 Zyxel
Device and wants to send an email, 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 Zyxel Device forwards SMTP traffic using TCP port 25.
