Date: Sun, 29 Apr 2012 19:20:54 +0300 From: Seth Mos <seth.mos@dds.nl> To: lev@FreeBSD.org, freebsd-net@freebsd.org Subject: Re: IPv6 MTU discrovery -- how should it work? Message-ID: <2vl4qolvow9yktrrufp56o2n.1335716454950@email.android.com>
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Make sure you do not block icmp6. Or atleast make sure that unreachable and toobig packets come through even if you do not want echo. Cheers, Seth typed on a tiny touchscreen, why exactly? Lev Serebryakov <lev@FreeBSD.org>schreef: >Hello, Freebsd-net. > > My home network is connected to IPv6 world with Hurricane Electric's >tunnel (IPv6 over IPv6, "gif"). > It has MTU 1280. > > Everything works till packets are small -- for example, interactive >shell (ssh) session over IPv6 works great. But when I need to transfer >buil of bytes from server to local network (scp, or even fast >scrolling of man page in interactive session) traffic hangs. It starts >to work after couple (5-10) minutes, but many applications has timeouts >less, that that, and it is very annoying in any case. > > When I connect to external server twice, and run tcpdump in one >session for another one, and then try to use second (sniffed) session >for bulk transfer, I can clearly see, that server tries to send IPv6 >packets with size 1420 to my local network many times and doesn't >get any answer, so it is MTU problem for sure, but how it could be fixed? > > Also, Youtube doesn't work over IPv6 with same symptoms, so it is not >only my servers' problem, it looks like my local network (and tunnel) >problem. > > How should it work? Maybe, I'm filtering out something mandatory on firewall? > >-- >// Black Lion AKA Lev Serebryakov <lev@FreeBSD.org> > >_______________________________________________ >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"
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