This is explained in the netfilter FAQ.
http://netfilter.kernelnotes.org/netfilter-faq-3.html#ss3.1
/ Magnus
On Thu, 1 Feb 2001 dmeyer@dmeyer.net wrote:
> I'm getting the occasional
>
> Feb 1 13:17:08 yendi kernel: NAT: 0 dropping untracked packet
> c3ea4da0 1 146.188.249.73 -> 209.220.232.240
>
> syslog message. What exactly does it mean? 146.188.249.73 isn't my
> machine at all, and 209.220.232.240 is my firewall. I assume I'm
> dropping someone's packets on the floor, but what can cause a packet
> to get dropped like that?
>
> --
> Dave Meyer
> dmeyer@dmeyer.net
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This archive was generated by hypermail 2b29 : Wed Feb 07 2001 - 21:00:14 EST