[ Thanks to Falko
Timme for this link. ]
“Firewall Builder is a firewall configuration and
management GUI that supports configuring a wide range of firewalls
from a single application. Supported firewalls include Linux
iptables, BSD pf, Cisco ASA/PIX, Cisco router access lists and many
more. The complete list of supported platforms along with
downloadable binary packages and soure code can be found at
http://www.fwbuilder.org.“In this tutorial we are going to cover how to use Firewall
Builder to configure a NAT rule that translates both the source and
destination IP addresses of the original packet. This type of NAT
configuration can be useful in a variety of network
configurations.“There are situations where both the source and destination IP
addresses of a packet need to be NAT’ed. The diagram below shows
just such a scenario where an internal server needs to be accessed
remotely from the outside using the Remote Desktop Protocol
(RDP).”