Fwd: Re: [ipv6hackers] funny FreeBSD bug

[Doug Barton]

FYI, this conversation is happening in the list below. I have no opinion
regarding whether it is a bug or not, but I thought folks here might be
interested.

Doug


-------- Original Message --------
Subject: Re: [ipv6hackers] funny FreeBSD bug
Date: Thu, 26 Jul 2012 19:26:08 +0200
From: Marc Heuse <mh at mh-sec.de>
Reply-To: IPv6 Hackers Mailing List <ipv6hackers at lists.si6networks.com>
To: IPv6 Hackers Mailing List <ipv6hackers at lists.si6networks.com>,
Simon Perreault <simon.perreault at viagenie.ca>

Hi Simon,

Am 26.07.2012 17:47, schrieb Simon Perreault:
> Le 2012-07-26 08:35, Marc Heuse a écrit :
>> I found a funny bug in freebsd (9.0 with all updates):
>> if you send an ICMP toobig message to it with a too low MTU size,
>> FreeBSD will prepend any packet data with an one-shot fragment (or
>> atomic fragment as Fernando calls it).
> 
> Why do you think it's a bug? 

first it servs no use to add the fragmentation header if the packet is
not fragmented. second I have not seen this behaviour in other OS,
however I havent looked for it though.

> Seems like normal IPv6 behaviour to me. It's in the RFC...
I cant remember having seen this in any rfc - do you have a pointer?

Greets,
Marc

--
Marc Heuse
www.mh-sec.de

PGP: FEDD 5B50 C087 F8DF 5CB9  876F 7FDD E533 BF4F 891A
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