port mapping for TCP/UDP

iskam da si govorq PC to PC programkata polzva 9089 port. na firewall nesym mu daval nikakvi zabrani vsichki verigi sa accept ama nemoje da mine nishto. ta kak da nastroq linuxa da prehvyrlq vsichki vryzki na toq port kym opredeleno IP ot vytreshnata mreja?
sys Linux Slackware 8.1 i maskiram 192.168.1.1 kym internet

iptables -t nat -A PREROUTING -p tcp --destination-port 9089 -j DNAT --to-destination 192.168.1.1:9089

neshto nestava taka
s PREROUTING li trea da stane?