Linux - Configuring a firewall to allow passive mode connections to ftp's behind it

[bamboozled]

I have a linux server running ip masq that hosts a connection to my win2k box. I have an ftp server on my win2k box that runs ok through port forwarding with ipmasqadm potfw. But I would like to figure out a way to allow passive mode connectivity so client's with a firewall can connect to my server. Any help would be greatly appreciated. Thanks

 

[bamboozled]

can anyone here help?