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tcp.4: undocument compressed TIME_WAIT

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This commit is contained in:
Gleb Smirnoff 2022-10-31 09:02:33 -07:00
parent c348e88053
commit 620042a66b
1 changed files with 1 additions and 18 deletions
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19
share/man/man4/tcp.4
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@ -753,23 +753,6 @@ A value of 2 results in any
packets to closed ports being logged. packets to closed ports being logged.
Any value not listed above disables the logging Any value not listed above disables the logging
(default is 0, i.e., the logging is disabled). (default is 0, i.e., the logging is disabled).
.It Va maxtcptw
When a TCP connection enters the
.Dv TIME_WAIT
state, its associated socket structure is freed, since it is of
negligible size and use, and a new structure is allocated to contain a
minimal amount of information necessary for sustaining a connection in
this state, called the compressed TCP
.Dv TIME_WAIT
state.
Since this structure is smaller than a socket structure, it can save
a significant amount of system memory.
The
.Va net.inet.tcp.maxtcptw
MIB variable controls the maximum number of these structures allocated.
By default, it is initialized to
.Va kern.ipc.maxsockets
/ 5.
.It Va minmss .It Va minmss
Minimum TCP Maximum Segment Size; used to prevent a denial of service attack Minimum TCP Maximum Segment Size; used to prevent a denial of service attack
from an unreasonably low MSS. from an unreasonably low MSS.
@ -786,7 +769,7 @@ application limited and the network bandwidth is not utilized completely.
That prevents self-inflicted packet losses once the application starts to That prevents self-inflicted packet losses once the application starts to
transmit data at a higher speed. transmit data at a higher speed.
.It Va nolocaltimewait .It Va nolocaltimewait
Suppress creation of compressed TCP Suppress creation of TCP
.Dv TIME_WAIT .Dv TIME_WAIT
states for connections in states for connections in
which both endpoints are local. which both endpoints are local.