"NAT: 0 dropping untracked packet..." messages

[Jason P Schanuel]

Hi,

I seem to be getting a handful of messages like the following:

NAT: 0 dropping untracked packet cdc12a80 1 <remote ip addr> -> <my ip addr>


I can pretty consistently get these by running mtr
( http://www.BitWizard.nl/mtr/ ) for a long time (like a half hour). As far as I
can tell mtr sends out ICMP echo messages with TTL set to increasing values to do
a full screen traceroute.

I have been getting these from linux-2.4.0-test1-ac10 up to and including ac17
(which reports itself as ac16 :-). I went back to the last kernel that I don't see
these messages (ac8) and I can't reproduce it with that. I never built an ac9
apparently but I would do so if it will help track down the start of this.

Anyone know the meaning of these messages. I looked through the source code for
ip_nat_standalone.c but unfortunately I was unable to decipher what causes the
message.

Thanks,
   Jason