Date: Sat, 28 Jul 2012 22:50:47 +0000 (UTC) From: "Bjoern A. Zeeb" <bz@FreeBSD.org> To: Doug Barton <dougb@FreeBSD.org> Cc: freebsd-net@FreeBSD.org Subject: Re: Fwd: Re: [ipv6hackers] funny FreeBSD bug Message-ID: <alpine.BSF.2.00.1207282249510.4474@ai.fobar.qr> In-Reply-To: <50117FB2.1060306@FreeBSD.org> References: <50117DB0.7010909@mh-sec.de> <50117FB2.1060306@FreeBSD.org>
next in thread | previous in thread | raw e-mail | index | archive | help
This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --0-1307323017-1343515848=:4474 Content-Type: TEXT/PLAIN; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8BIT On Thu, 26 Jul 2012, Doug Barton wrote: > 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. > You can point the people at both the RFC and the SA we have issues a couple of years ago and why it's always 4 or 8 bytes below the minimal MTU. It's all good. > > > -------- Original Message -------- > Subject: Re: [ipv6hackers] funny FreeBSD bug > Date: Thu, 26 Jul 2012 19:26:08 +0200 > From: Marc Heuse <mh@mh-sec.de> > Reply-To: IPv6 Hackers Mailing List <ipv6hackers@lists.si6networks.com> > To: IPv6 Hackers Mailing List <ipv6hackers@lists.si6networks.com>, > Simon Perreault <simon.perreault@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 > _______________________________________________ > Ipv6hackers mailing list > Ipv6hackers@lists.si6networks.com > http://lists.si6networks.com/listinfo/ipv6hackers > > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > -- Bjoern A. Zeeb You have to have visions! Stop bit received. Insert coin for new address family. --0-1307323017-1343515848=:4474--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?alpine.BSF.2.00.1207282249510.4474>