IPCHAINS syntax

ipchains -A chain :append rule to chain (input, output, forward) -F : flush chain rules -L : list rules -s : source address [port] -d : destination address [port] -y : SYN flag (! -y is not SYN flag) -p : protocol (TCP, UDP, ICMP) -i : interface (eth0) -j : what to do (ACCEPT, DENY, REJECT, MASQ) -l : log