[Bug 173444] [socket] [patch] IPV6_USE_MIN_MTU and TCP is broken

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=173444

--- Comment #9 from marka at isc.org ---
(In reply to Andrey V. Elsukov from comment #7)
RFC 6691

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.

IPV6_USE_MIN_MTU=1 changes the effective MTU of the interface for this
socket.

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