I have a situation where some separate domains/servers will be moved to 
a location that is behind a single firewall (and IP).  We want to keep 
each of the boxes functioning as usual, so realize we'll need a gateway 
box of some sort.

For websites, we can do VHosts with ProxyPass/ProxyPassReverse.  And for 
email we can setup Postfix/qmail/etc to behave as a gateway to the 
internal device.  But is there a better way to accomplish this?  And 
what about Pop3, IMAP, FTP, etc?

Is there a decent way to put in a gateway server to handle all of this? 
  Or are we limited to handling it on a package by package basis?

To highlight the problems, imagine the following:

domainA - requires web, smtp, POP3, and resides on it's own server
domainB - requires web, smtp, IMAP, and FTP. resides on it's own server.
domainC - requires FTP only, resides on it's own server.
domainD - requires smtp, POP3, IMAP, resides on it's own server

In all cases, SSH access is required.

So, is there a gateway service for SSH, POP3, IMAP, and FTP?  The 
services would need to be forwarded to the appropriate box, but how do 
you know which box is the right destination when all you have is the 
port number?

 From a firewall perspective, I can see using different ports, but that 
will only work in a few cases.

I think I'm missing a simpler solution somewhere, so thought I'd check 
with our experts.. :)

Thanks for any tips.

Shawn

(ps - I know I can *make* it work, but would prefer to keep the 
maintenance as low as possible)


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