full-disclosure - Re: ICMP Destination Unreachable Port Unreachable

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Date: Tue, 15 Aug 2006 14:31:09 -0400
From: "Richard Bejtlich" <taosecurity@...il.com>
To: full-disclosure@...ts.grok.org.uk, simon@...soft.com, 
	dudevanwinkle@...il.com
Cc: 
Subject: Re: ICMP Destination Unreachable Port Unreachable

Adriel T. Desautels wrote:
>
> Hi List,
> I've been receiving this traffic for a while from the same IP address. Does anyone \
> have any idea what type of traffic this might be. Neither the source IP or the target \
> IP have any ports associated with them in this event. Any ideas would be appreciated. \

Hello,

Looking at the presumed ICMP payload you posted, and starting with
0x45, you have a UDP packet from 70.91.131.49:16229 to
82.246.252.214:2597.

I decoded this quickly -- someone feel free to correct me if I'm wrong.

Nothing appears to be listening on port 2597 UDP, so you are seeing a
"ICMP Destination Unreachable Port Unreachable" ICMP error message.

Your IDS is not reporting ports because ICMP doesn't use ports.

Sincerely,

Richard
http://taosecurity.blogspot.com

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