FTP Forwarding

[netfilter@xxxxxxxxxxxxx (Bantam)]

Hi,

I've been trying to forward port 21 to an ftp server on another machine, IP
address  10.0.0.199.

eth1 - external (connected to the net)
eth0 - internal

/sbin/iptables -A FORWARD -p tcp -i eth1 --dport 21 -j ACCEPT
/sbin/iptables -A PREROUTING -t nat -p tcp -i eth1 --dport 21 -j DNAT --to
10.0.0.199:21

but can't get it to work..

any ideas ?

Thanks

Wasim