this iptable

ok i have been looking at iptables and have been studying it.

am i right in thinking that the iptable below will only let incomming packets on port 80, unless my server talks to the recieving computer first


iptables -A INPUT -i eth0 -p tcp --syn --destination-port ! 80 -j DROP

if i am totally wrong, please tell me, as i really wanna learn, thanx this iptable

 

 

 

 

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