F-Secure Internet Gatekeeper for Linux/Administrator’s Guide
109
10.2.2
Transparent Proxy – Router Mode
To function as a transparent proxy in router mode, you must install Internet Gatekeeper on a computer,
which acts as a router between the clients and the servers.
This diagram below illustrates how to set up the product as a transparent proxy in a DMZ network.
SERVER:110
9110
FSIGK(192.168.0.99): F-Secure Internet Gatekeeper for Linux
SERVER: Server (HTTP, SMTP, POP, FTP)
Top-level Router
Client
Client
Client
Lower level Router (Default route: FSIGK)
SERVER:110
FSIGK:9110
SERVER:110
DMZ(192.168.0.0/255.255.255.0)
Internet
1
2
F-Secure Internet
Gatekeeper for Linux
Service (fsigk)
4
*:110=>FSIGK:9110
NAT Tables
(iptables / ipchains)
3