[Bug 143666] [ip6] [request] PMTU black hole detection not implemented
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Date: Tue, 28 Jan 2025 20:45:29 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=143666
Michael Tuexen <tuexen@freebsd.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|Open |Closed
Resolution|--- |FIXED
CC| |tuexen@freebsd.org
--- Comment #7 from Michael Tuexen <tuexen@freebsd.org> ---
I think this can be closed, since PMTU balckhole detection is now implemented.
From tcp.4:
pmtud_blackhole_detection
Enable automatic path MTU blackhole detection. In
case of retransmits of MSS sized segments, the OS
will lower the MSS to check if it's an MTU
problem. If the current MSS is greater than the
configured value to try
(net.inet.tcp.pmtud_blackhole_mss and
net.inet.tcp.v6pmtud_blackhole_mss), it will be
set to this value, otherwise, the MSS will be set
to the default values (net.inet.tcp.mssdflt and
net.inet.tcp.v6mssdflt). Settings:
0 Disable path MTU blackhole detection.
1 Enable path MTU blackhole detection for
IPv4 and IPv6.
2 Enable path MTU blackhole detection only
for IPv4.
3 Enable path MTU blackhole detection only
for IPv6.
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