FTP across two firewalls.

From: Adrian Chung (chungm@uoguelph.ca)
Date: Sat Jan 08 2000 - 04:05:14 EST

Hi all!

In the following setup:
-one masq'd ftp client behind a firewall, and the masq'd target server
behind another firewall.
-the second firewall uses ipmasqadm portfw to redirect traffic on port 210
of the firewall to port 21 of the masq'd target server.

Neither passive nor active mode ftp data transfers work!

However, if the second firewall redirects port 21 traffic to port 21 of the
masq'd target server, everything works fine.

Is there an explanation for this, or is there a way to get things to work
properly if port 21 is not the original firewall port?


Adrian Chung - adrian@enfusion-group.com

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