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FTP through Back to Back Firewalls

FTP through Back to Back Firewalls

(OP)
Hi

The company I work for is taking over some business from another company and during the transition the two companies have setup a link between the two networks, each company operates its own firewall so any communication between the two networks has to be approved by both sides.

Part of the system that I am trying to transition uses FTP to transfer files, but I am being told that this is an issue because FTP uses random port numbers to transfer the files, this is OK on a single firewall setup because the firewall can cope with the random port selection, but with back to back firewalls this doesn't work.

I was of the understanding that it was FTP Active mode that used a Random port and that Passive mode was restricted to ports 20 & 21. Is this correct? If not what other options are there for running FTP over B2B firewalls that doesn't involve opening up thousands of ports?

Thanks

Dave

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