i am new to these terms and i can’t find any clear definition for these two terms and how to use them in mikrotik.does any one know exactly how to use them ?and what is the difference between them and the forward chain and why they are found in mikrotik if we have the forward chain do the same job for us.?
Look on the web for IPTABLES info ,there are input output prerouting postrouting and forward chains.
You can have a lot of info at site http://www.netfilter.org
Regards.
thanks a lot 