21 from the world to the server.
20 from the server to the world (the server
   initiates a connection on port 20 back to
   the originator of the session)

On Wed, 10 Jul 2002, Howard Shaw wrote:

> I'm setting up a port filtering firewall for an ftp server..  I'm using
> iptables.  What ports beside 21 do I need to allow connections to for
> this to work?
>
> Howard J. Shaw
> howard@excelco.com
> 480-217-4214