[ale] Iptables: Packets from port 80 to unestablished ports

[Kevin Krumwiede]

On Sat, 19 Jul 2003 11:47:01 -0400
Mike Millson <mmillson at meritonlinesystems.com> wrote:

> I have noticed a number of packets that my iptables firewall is dropping
> from port 80 because they are unrelated to an established connection. 
> 
> For example:
> 
> 07/19-08:52:53 kernel: ?INPUT:IN=ppp0 OUT= MAC= SRC=208.217.109.66
> DST=68.157.175.145 LEN=1452 TOS=0x00 PREC=0x00 TTL=50 ID=60713 DF
> PROTO=TCP SPT=80 DPT=35552 WINDOW=9648 RES=0x00 ACK URGP=0 
> 
> This is a legitimate site that I was visiting, so I revisited the site
> and logged all packets. It appears that several times per visit the web
> server sends one of these ACK packets to a port that has not previously
> been used in the conversation.

I've always seen this in my logs.  CNN's site is (or was) one that does this.  No idea why.
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