RE: conntrack ftp fails to handle PORT (and PASV?) command when split over multiple TCP packets

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Philip:

Thanks for the pointer to frox.

I'm not sure if the DSL modem vendor would add in this piece of opensource
software to their box, but we'll see.

Regards,

Frank

-----Original Message-----
From: Philip Craig [mailto:philipc@xxxxxxxxxxxx] 
Sent: Monday, November 17, 2008 6:30 PM
To: Frank Bulk
Cc: netfilter-devel@xxxxxxxxxxxxxxx
Subject: Re: conntrack ftp fails to handle PORT (and PASV?) command when
split over multiple TCP packets

Frank Bulk wrote:
> Can anyone confirm that iptables still behaves this way, and if so, code a
> fix so that no matter how many packets a PORT or PASV command are split
over
> (in other words, no matter how small the client's MTU) that iptables ACKs
> each packet received on the LAN side and the ALG properly reassembles the
> command and sends it out the WAN interface?

iptables is a packet filter, not an ALG.  You could add more state to the
helper, but it would be hard to get right, and I don't think it is worth
the effort.  Try using a userspace ftp proxy instead.  (eg I've used frox
with no problems.)


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