[Bug 239749] Issues path MTU discovery on IPv6 and SSH.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239749

Michael Tuexen <tuexen at freebsd.org> changed:

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                 CC|                            |tuexen at freebsd.org

--- Comment #10 from Michael Tuexen <tuexen at freebsd.org> ---
I guess you traced at the router.

Could you run the first and third scenario with tracing at the client and the
router at the same time? I'm wondering if the client receives the ICMPv6 PTB
message at all.
Right now, I don't see a problem with the TCP stack on the client side.

To improve the situation, you could enable blackhole detection by setting
sudo sysctl -w net.inet.tcp.pmtud_blackhole_detection=1

Then the TCP connections should not stall, but should automatically reduce the
MSS after a (small) number of retransmissions.

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