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List:       wireshark-users
Subject:    Re: [Wireshark-users] What happen when the Checksum of ICMP segment is received wrong
From:       Guy Harris <guy () alum ! mit ! edu>
Date:       2014-03-25 15:56:27
Message-ID: AA65CE14-30DA-49B8-9DBC-3A3DB1649FF9 () alum ! mit ! edu
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On Mar 25, 2014, at 6:51 AM, "Pablo Brozovich" <Pmbm@mail2world.com> wrote:

> When the Checksum of Internet Control Message Protocol (ICMP) segment is received \
> wrong for a receiver, what happen? Do it send a message to sender?

No.  To quote RFC 792:

	http://tools.ietf.org/html/rfc792

   The ICMP messages typically report errors in the processing of
   datagrams.  To avoid the infinite regress of messages about messages
   etc., no ICMP messages are sent about ICMP messages.  Also ICMP
   messages are only sent about errors in handling fragment zero of
   fragemented datagrams.  (Fragment zero has the fragment offeset equal
   zero).
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