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Date:      Mon, 5 Mar 2007 11:57:31 -0800 (PST)
From:      Lyndon Nerenberg <lyndon@orthanc.ca>
To:        Tom Judge <tom@tomjudge.com>
Cc:        freebsd-net@freebsd.org, aditya kiran <adityaa.kiran@gmail.com>
Subject:   Re: PMTU Discovery support
Message-ID:  <20070305115615.W38684@orthanc.ca>
In-Reply-To: <45EC6E88.3080101@tomjudge.com>
References:  <994cd1cf0703050842r5e54daa6y5fe6af3083e15cd@mail.gmail.com> <45EC6E88.3080101@tomjudge.com>

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> As I understand it, it is not possible to detect upward changes in the path 
> MTU as there is no mechanism for a router to generate an error when a packet 
> is small enough to be accommodated by the MTU of the link to the next hop.  I 
> may be wrong though.

RFC1191 section 6.3.

http://www.ietf.org/rfc/rfc1191.txt

--lyndon



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