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| author | sbruno <sbruno@FreeBSD.org> | 2014-10-13 21:04:14 +0000 |
|---|---|---|
| committer | sbruno <sbruno@FreeBSD.org> | 2014-10-13 21:04:14 +0000 |
| commit | 21257a95b0d464945872e585d1074da7e35697d4 (patch) | |
| tree | 4868888ed98a5d88b696c40ad08f7e55f42c724b | |
| parent | 970ba4b3da6ae653d8156283c8da497eca62f73f (diff) | |
| download | FreeBSD-src-21257a95b0d464945872e585d1074da7e35697d4.zip FreeBSD-src-21257a95b0d464945872e585d1074da7e35697d4.tar.gz | |
Update tcp(4) with plpmtud blackhole sysctls
Submitted by: Mikhail <mp@lenta.ru>
MFC after: 2 weeks
Relnotes: yes
| -rw-r--r-- | share/man/man4/tcp.4 | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/share/man/man4/tcp.4 b/share/man/man4/tcp.4 index a95078f..2b6668f 100644 --- a/share/man/man4/tcp.4 +++ b/share/man/man4/tcp.4 @@ -518,6 +518,21 @@ avoid packet drops. Number of retries (SYN or SYN/ACK retransmits) before disabling ECN on a specific connection. This is needed to help with connection establishment when a broken firewall is in the network path. +.It Va pmtud_blackhole_detection +Turn on automatic path MTU blackhole detection. In case of retransmits we will +lower the MSS to check if it's MTU problem. If current MSS is greater than +configured value to try, it will be set to it, otherwise, MSS will be set to +default values (net.inet.tcp.mssdflt and net.inet.tcp.v6mssdflt). +.It Va pmtud_blackhole_mss +MSS to try for IPv4 if PMTU blackhole detection is turned on. +.It Va v6pmtud_blackhole_mss +MSS to try for IPv6 if PMTU blackhole detection is turned on. +.It Va pmtud_blackhole_activated +Number of times the code was activated to attempt a MSS downshift. +.It Va pmtud_blackhole_min_activated +Number of times the blackhole MSS was used in an attempt to downshift. +.It Va pmtud_blackhole_failed +Number of times that we failed to connect after we downshifted the MSS. .El .Sh ERRORS A socket operation may fail with one of the following errors returned: |
