Fire Wall: Firewall Builder

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).