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

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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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