[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 #10 from marka at isc.org ---
(In reply to Andrey V. Elsukov from comment #8)
So what!  Most DNS/TCP response is a few of packets.  What does it
matter if it is the 3 or 4 packets.

What matters is avoiding PMTUD as it is NOT reliable.  Setting the
IPv6 packet size to 1280 avoids triggering PMTUD issues.  Limiting
the packet size avoids timeout and retransmissions due to PTB not
been generated due to rate limiting or being lost due to stupid
load balancers and firewalls that drop ICMP.

Go put your validating resolvers behind a IPv6 in IPv4 link then
come back and say this is not needed.

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