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Subject: [Bug 173444] [socket] [patch] IPV6_USE_MIN_MTU and TCP is broken
Date: Fri, 31 Mar 2017 01:02:36 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D173444

--- Comment #11 from Andrey V. Elsukov <ae@FreeBSD.org> ---
(In reply to marka from comment #9)
> (In reply to Andrey V. Elsukov from comment #7)
> RFC 6691
>=20
> o  As a result, when the effective MTU of an interface varies, TCP
>    SHOULD use the smallest effective MTU of the interface to calculate
>    the value to advertise in the MSS option.
>=20
> IPV6_USE_MIN_MTU=3D1 changes the effective MTU of the interface for this
> socket.

This is socket option and it doesn't change interface's MTU value and doesn=
't
affect MSS value, as I see. It just instructs the kernel explicitly do IPv6
fragmentation exactly as described in the RFC3542.

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