Ethereal-dev: Re: [ethereal-dev] ICMP Checksum

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From: Guy Harris <guy@xxxxxxxxxx>
Date: Fri, 9 Jun 2000 15:21:07 -0700 (PDT)
> Is the ICMP checksum verified when the packet header is displayed?

No.  We only check the IP checksum, right now; I have a patch to check
the TCP and UDP checksum, although the version I sent out includes the
FreeBSD C-language IP checksum code, which is BSD-licensed with, I
think, the "give credit" clause that conflicts with some GPL clauses.

> BTW, does anyone have a references to ICMP Address Mask request/reply
> documentation?

RFC 950, "Internet Standard Subnetting Procedure".