M0n0wall's firewall rule setup. Rules can be set up by address and port across all interfaces supported by the the underlying hardware. Additionally protocols can be NAT'd (handled via network address translation) or even remapped (to allow the user to use protocols that may be blocked by an ISP's routing rules).
© CNET Networks - Submitted by David Spector
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Bill Detwiler is Managing Editor of TechRepublic and Tech Pro Research and the host of Cracking Open, CNET and TechRepublic's popular online show. Prior to joining TechRepublic in 2000, Bill was an IT manager, database administrator, and desktop support specialist in the social research and energy industries. He has bachelor's and master's degrees from the University of Louisville, where he has also lectured on computer crime and crime prevention.