Ipchains portfw problems

1) Ja izpolzuju router/firewall na baze ipchains (192.168.0.1) 2) Za routeram nahoditsa FTP server (192.168.0.100) 3) V router rule set ja vjol: ipmasqadm portfw -a -p tcp -L 192.168.0.1 -R 192.168.0.100 21

Problema:

Jesli padkluchatsa k FTP serveru iz drugova PC v internete vsjo rabotajet, no jesli ja hochu podkluchitsa k FTP s lokal net port forwarding nerabotajet.