F-SECURE INTERNET GATEKEEPER FOR LINUX 4.01 Administrator's Manual page 51

• Use the " Edit NAT (iptables) redirect settings". To do this, click
redirect settings.
• Use the iptables command from the command line to specify the setting as follows. (The
example shows the port number being set to 9110.)
# iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 110 ¥
-j REDIRECT --to-port 9110
For more information, see
Edit NAT (iptables) redirect settings
NAT
Specifies the NAT redirection settings. If you select the
connections for port 110 are redirected to the POP proxy (port 9110).
F-Secure Internet Gatekeeper for Linux/Administrator's Guide
"Transparent Proxy", 108.
Edit NAT (iptables)
checkbox, all
POP redirect
51