ipt -A in_inetbr -p tcp --dport 21 -j ACCEPT
ipt -A in_inetbr -p tcp --dport 2121 -j ACCEPT

ipt -A in_inetbr -p tcp --dport 19200:20200 -j ACCEPT

#identd -> REJECT [needed, but DROP if not]
ipt -A in_inetbr -p tcp --dport 113 -m limit --limit 4/s -j REJECT

ipt4 -t nat -A pre_inetbr -p tcp --dport 21 -j REDIRECT --to-port 2121
