Date: Sun, 29 Apr 2012 20:02:48 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: freebsd-net@freebsd.org Subject: Re: IPv6 MTU discrovery -- how should it work? Message-ID: <1561150913.20120429200248@serebryakov.spb.ru> In-Reply-To: <1311430753.20120429184752@serebryakov.spb.ru> References: <75233009.20120429183559@serebryakov.spb.ru> <1311430753.20120429184752@serebryakov.spb.ru>
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Hello, Lev. You wrote 29 =D0=B0=D0=BF=D1=80=D0=B5=D0=BB=D1=8F 2012 =D0=B3., 18:47:52: LS>> When I connect to external server twice, and run tcpdump in one LS>> session for another one, and then try to use second (sniffed) session LS>> for bulk transfer, I can clearly see, that server tries to send IPv6 LS>> packets with size 1420 to my local network many times and doesn't LS>> get any answer, so it is MTU problem for sure, but how it could be fix= ed? And I can not set mtu less than 1280 on gif0, and my IPv4 interface only have 1460, as it is PPPoE interface. Maybe, problem is here, as MTU 1280 assumes outer MTU is 1500? --=20 // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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