Now over to NAT!


NAT = Network Address Translation

there was a very limited implementation in kernel 2.2 called
ip_masquerade

NAT in iptables is a lot more powerful.

There's two main NAT usages
SNAT
Source NAT, changes the sourceaddress of a connection
DNAT	
Destination NAT, the same but changes the destinationaddress
(also called RNAT (Reverse NAT) in some implementations)