RE: portfw on iptables 2.4 kernel problem.

[Raymond Leach <raymondl@knowledgefactory.co.za>]

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Thank you for clearing that up. I must have not installed/invoked the
ftp connection tracking modules for iptables then...

Ray

On Tue, 2002-12-10 at 13:52, Jozsef Kadlecsik wrote:
> On 10 Dec 2002, Raymond Leach wrote:
> 
> > OK, then how does connection tracking work for passive ftp?
> 
> The FTP connection tracking and NAT helper modules support active (PORT,
> EPRT) and passive (PASV, EPSV responses) ftp as well. In both cases the
> command channel is monitored and the commands/responses are parsed. As the
> appropriate patterns detected, the system digs out the announced
> port (address) and prepares to accept the data channel.
> 
> At iptables level there is no difference whatsoever between active/passive
> modes in letting in/NATing them.
> 
> Regards,
> Jozsef
> -
> E-mail  : kadlec@blackhole.kfki.hu, kadlec@sunserv.kfki.hu
> PGP key : http://www.kfki.hu/~kadlec/pgp_public_key.txt
> Address : KFKI Research Institute for Particle and Nuclear Physics
>           H-1525 Budapest 114, POB. 49, Hungary
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