FTP Server Behind Masq. Firewall.

I have a small network here set up at my house connected to the internet through a Linux machine with IP Masquerading. Are there any tools that I can use to allow an FTP server to run and be accessible to the internet from behind the firewall?
jguerinAsked:
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j2Commented:
You need ipmasqadm, and set up a port forward, AND the clients will have to use PASV mode.
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jguerinAuthor Commented:
Ok thanks for the answer... let me double check these steps with you first.
1) Put ipmasqadm on the machine
2) Forward port X on firewall to Y on inside machine.
3) If clients use PASV mode, that takes care of the whole multi-port issue that keeps it from working in the firsrt place? (Could you briefly explain what PASV mode does? I know it fixes it but not sure why.)
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j2Commented:
2) you need to forward ports 20 and 21

PASV mode prety much just says "just send the data back the same way it came" (normally you include a source IP in the port request)

PASV mode is however a security risk.

in SOME cases you dont need pasv if you forward the ports coprrectly, but your milage may vary :)
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j2Commented:
Question tho, if the server you will run ftp on is also unix, why not have the server on the firewall, and just NFS mount the drives?

If it is a Win file server, you could SMB mount the disks?
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jguerinAuthor Commented:
Well, purposes are two...

First of all I have too many computers so I thought I'd put this one to use. I need kind of a personal ftp server for the inside that I would like certain friends to use.

Second somehow my other one became the target of some warez pups. I shut off anonymous access on it after I found this out (at the same time finding out someone tried to overwrite the inodes).

I have one more question though... you say I need to forward ports 20 and 21... That's kind of a problem because I still have an ftp server on that machine. I planned on forwarding 1021 through... but what should I do about the port 20 (or equivalent)?
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j2Commented:
Oh, doesnt matter, i just assumed it was the _only_ ftp server, just forward whats apropriate.
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