Ethereal-users: Re: [Ethereal-users] ICMP

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From: LEGO <luis.ontanon@xxxxxxxxx>
Date: Tue, 22 Mar 2005 01:38:13 +0100
> ICMP is IP protocol #1 and UPD is #17.  They are two completely
> unrelated protocols.

After its header ICMP message type 3 (ICMP Unreachable)  contains the
IP header of the original IP packet (the one that could not reach) and
the first 8 bytes of its payload which can very well be UDP.  That's
why you can find an UDP fragment inside an IP packet.