I have been reading up on reverse FTP; the concept of how it works as well as the configuration. However none could fully fufil my understanding base my the scenario I was give. Most of the web sites only states the commands to forward any FTP request to a proxy server. What I wanted to learn exactly how each individual nodes in the setup has to be configured (except the firewall)
[Internal FTP Server] -> [DMZ Reverse FTP Server] -> [External Clients Computers/Servers]
When a legitimate client computer/server on the external network make a FTP request to the FTP server in the internal network, there will be a reverse FTP server which forwards the request between them.
There will be two firewalls in between the reverse FTP server, external client and internal. A typical back-to-back firewall topology.
FTP server will be installed on the internal FTP server (Normal Mode)
- The internal FTP server has to be configure to forward and receive any FTP request to/from the reverse FTP server in the DMZ
- The reverse FTP server has to be configure as a proxy server that can receive and forward any FTP request
- External clients/servers should only be able to see the public IP address of the interface of the public facing firewall
- Both servers, the FTP server and the reverse FTP server are running on Linux RHEL 6 OS
What at the commands and steps should I take to perform such configurations on the FTP server as well as the reverse FTP server? Is there any security measures that I should take note of?