Introduction to IP CHAINS
The kernel starts with three lists of rules; these lists are called firewall chains or just chains. The three chains are called input, output and forward. When a packet comes in (say, through the Ethernet card) the kernel uses the input chain to decide its fate. If it survives that step, then the kernel decides where to send the packet next (this is called routing). If it is destined for another machine, it consults the forward chain. Finally, just before a packet is to go out, the kernel consults the output chain.
(Submitted by Dr.T Mon May 19, 2003 )
Our content can be syndicated: Main page Mac Page
Copyright 1999-2005 Noel Davis. Noel also runs web sites about sailing and kayaking.
All trademarks are the property of their owners.
All articles are owned by their author