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Correct naming of sysctl pmtud_blackhole_activated_min_mss.

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Clarify some statements around PMTUD blackhole detection to make
the behavior more clear in the man page.

Submitted by:	Mikhail <mp@lenta.ru>
MFC after:	2 weeks
This commit is contained in:
sbruno 2014-12-28 20:56:03 +00:00
parent 0090bedb0f
commit 26a4abd5a2
1 changed files with 8 additions and 7 deletions
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15
share/man/man4/tcp.4
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@ -521,11 +521,11 @@ 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
In case of retransmits OS 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
configured value to try, it will be set to configured value, otherwise,
MSS will be set to default values
.Po Va net.inet.tcp.mssdflt
and
.Va net.inet.tcp.v6mssdflt
@ -535,11 +535,12 @@ 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.
Number of times configured values were used in an attempt to downshift.
.It Va pmtud_blackhole_activated_min_mss
Number of times default 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.
Number of connections for which retransmits continued even after MSS
downshift.
.El
.Sh ERRORS
A socket operation may fail with one of the following errors returned: