Hi, For you gurus this might be superfluous but for the lambda user a tool which given an input packet (xxx.xxx.xxx.xxx:tcp:25) and a set of rules, show how the packet goes from one rule to the other and finally make it to it's destination , gets tansformed or dropped. This would help enormously in understanding how this stuff works (no it's not that obvious) and I also think it would be a great help when adding rules. Does such a utility exist? Cheers, Nadim.