Re: IPv6 MTU discrovery -- how should it work?

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From
Lev Serebryakov <lev@FreeBSD.org>
Date
29 Apr 2012 16:02:51
Subject
Re: IPv6 MTU discrovery -- how should it work?
Message-ID
1561150913.20120429200248@serebryakov.spb.ru

In reply to

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Hello, Lev.
You wrote 29 2012 ., 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 fixed?
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?

--
// Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>


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