linux - Reverse Proxy multiple internal FTP Servers

I have setup a reverse proxy for http using Apache mod_proxy like this:

• Client > http:/abc.domain1.com > Reverse Proxy Server > 192.168.50.1 (Internal Server)




• Client > http:/def.domain2.com/ > Reverse Proxy Server > 192.168.50.2 (another internal Server)

Now I want to acheive the same for FTP:

• Client > ftp:/abc.domain1.com/ > Reverse Proxy Server > ftp:/192.168.50.1 (internal FTP Server)




• Client > ftp:/def.domain2.com/ > Reverse Proxy Server > ftp:/192.168.50.2 (another internal FTP Server)

Both internal FTP Servers are running vsftpd. Please let me know the setup for Redhat/Centos.

Reason: I have only one public IP available.