Date: Thu, 09 Jun 2011 08:04:27 +1200 From: Matthew Luckie <mjl@luckie.org.nz> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: freebsd-net@freebsd.org Subject: Re: FreeBSD, IPv6 and World IPv6 Day Message-ID: <4DEFD5CB.7060703@luckie.org.nz> In-Reply-To: <C4131475-4168-48F5-A7F9-4B76AA422969@lists.zabbadoz.net> References: <20110608143359.GA478@spandex.luckie.org.nz> <C4131475-4168-48F5-A7F9-4B76AA422969@lists.zabbadoz.net>
next in thread | previous in thread | raw e-mail | index | archive | help
>>> I found measurement results on this website: >>> http://hide.dnsalias.net/aaaa/worldipv6day.cgi >> >> Some more results: >> >> http://www.wand.net.nz/~mluckie/ipv6day/ > > Interesting. Did you post on the v6 lists as well? Just on ipv6-techsig@listserv.internetnz.net.nz Feel free to forward on to other lists if you think its useful. >> http://www.freebsd.org/cgi/query-pr.cgi?pr=145733 > > That's the frag6 ipfw iusse, right? Well actually 3 issues. I have this > is open in my other window today after having stared at it for too long. > > BTW. does anyone have any idea what kind of systems generate these packets? > Does anyone have packet dumps of them? A couple of people would be > curious to have/see that. In terms of systems that will respond to a PTB by sending IPv6 fragments rather than sending smaller TCP packets: http://www.kddi.com http://dream.jp/ http://www.ubc.ca/ http://www.goneo.de/ http://www.nict.go.jp/ (I can go on further if you want) If I had to guess at what OS sends these packets I'd guess netbsd or openbsd but I've never looked. To reproduce above, use http://www.wand.net.nz/scamper/scamper-cvs-20110608.tar.gz http://www.wand.net.nz/scamper/pmtud Use -M 1480, that will cause the last fragment to be small and trigger one of the bugs in the PR. In terms of systems that will respond to a PTB with nhmtu < 1280, it seems most follow the advice in RFC2460 and send packets with a fragmentation header without fragmenting the packet. Use -M 576 with your scamper command line.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4DEFD5CB.7060703>