Pure FTP as a reverse ftp proxy

[tokerau]

I'm trying to save my IP addresses, I don't have many. I have several servers and I would like to be able to have one reverse proxy and have all my servers be behind the one. I have pound for HTTP, and I have read that Postfix can be used as a reverse proxy for email (I haven't tried it yet), but I can't find anything for FTP.

Is it possible to use Pureftp as a revers FTP proxy?

Does anyone have a better solution? I will have a couple of Ispconfig servers, and a couple of other web servers that are not Ispconfig.

Thanks for responses!