ftp proxy using FQDN's

I have two servers behind a Watchguard, one is a linux server, one is a windows server. The watch guard forwards http and ftp requests (ports 80, and 21) to a proxy server.

I have configured apache on the proxy server so I can proxy the http requests to either server based on domain names as below


  ServerName        mysite.com.au
  ProxyPreserveHost On
  ProxyPass         "/" "http://10.0.2.21/"
  ProxyPassReverse  "/" "http://10.0.2.21/"




    ServerName        mysite.net.au
    ProxyPreserveHost On
    ProxyPass         "/" "http://10.0.2.31/"
    ProxyPassReverse  "/" "http://10.0.2.31/"

So .com.au goes to 10.0.2.21, and .net.au goes to 10.0.2.31. These are both internal servers.

I want to do the same type of forwarding for ftp (port 21).

So if I try to ftp to a site hosted on the windows server, the proxy will know it is hosted on the windows server (10.0.2.31) and forward the ftp requests to the correct server.

What i want to do is employ a proxy that listens on port 21 and forwards the traffic to the appropriate ftp server based on the dns name requested. I have the proxy and it is already working for http but I need to know how to do the same for ftp.

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