Date: Thu, 23 Aug 2007 15:34:25 +0900 From: JINMEI Tatuya / =?ISO-2022-JP?B?GyRCP0BMQEMjOkgbKEI=?= <jinmei@isl.rdc.toshiba.co.jp> To: Daniel Hartmeier <daniel@benzedrine.cx> Cc: freebsd-net@freebsd.org, Jacek Zapala <jacek@ipv6.jacek.it.pl> Subject: Re: kern/115413: [ipv6] ipv6 pmtu not working Message-ID: <m1bqcywyha.wl%jinmei@isl.rdc.toshiba.co.jp> In-Reply-To: <20070821163505.GA28667@insomnia.benzedrine.cx> References: <200708211010.l7LAA6V7082258@freefall.freebsd.org> <20070821121118.GF27160@insomnia.benzedrine.cx> <1187703472.22531.4.camel@localhost.localdomain> <20070821135048.GA32421@insomnia.benzedrine.cx> <1187705811.30269.5.camel@localhost.localdomain> <20070821143125.GB32421@insomnia.benzedrine.cx> <1187707117.846.3.camel@localhost.localdomain> <20070821145047.GC32421@insomnia.benzedrine.cx> <1187713068.3973.6.camel@localhost.localdomain> <20070821163505.GA28667@insomnia.benzedrine.cx>
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At Tue, 21 Aug 2007 18:35:05 +0200,
Daniel Hartmeier <daniel@benzedrine.cx> wrote:
> > But I'm not sure if I understood well - you suspect that only 8 bytes of
> > tcp header are copied from the original tcp packet to the icmp message
> > by the router?
>
> No, the router is only required (by the RFCs) to quote the first 8 bytes
> of the TCP header.
This is not true for IPv6. From Section 2.4 of RFC4443:
(c) Every ICMPv6 error message (type < 128) MUST include as much of
the IPv6 offending (invoking) packet (the packet that caused the
error) as possible without making the error message packet exceed
the minimum IPv6 MTU [IPv6].
JINMEI, Tatuya
Communication Platform Lab.
Corporate R&D Center, Toshiba Corp.
jinmei@isl.rdc.toshiba.co.jp
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