Interesting options of iptables
Do you know...you can add comment to iptables rules by
iptables -I INPUT 1 -p tcp --dport 22 -j ACCEPT -m comment --comment "Incoming SSH"
you can specify ip range
iptables -I INPUT 1 -m iprange --src-range 10.0.0.1-10.0.0.254 --dst-range 10.2.0.1-10.2.0.254 -j ACCEPT
you can specify multiple ports
iptables -I INPUT 1 -p tcp -m multiport --dports 20:22,25,80,110,443 -j ACCEPT
