Everyone:

I've just attempted to build a router using FreeBSD 8.0 with IPFW's firewall NAT. I've included the following NAT parameters:

ipfw nat 123 config if xl0 log redirect_port tcp 10.0.1.99:21 21 redirect_port tcp 10.0.1.99:20 20

Note that, among other things, incoming FTP is redirected to the host at 10.0.1.99 inside the firewall.

The problem we're having is that users are having trouble reaching the FTP server with some clients -- in particular, Microsoft Internet Exploder. (I don't WANT them to be using IE, but I do not have control over this.) Does anyone know if I need to set anything special to make the firewall track FTP data ports?

--Brett Glass

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