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Document new net.inet.tcp.ecn.enable sysctl settings.

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MFC after:	1 month (with r300240)
This commit is contained in:
Don Lewis 2016-05-19 23:03:07 +00:00
parent 12d532388d
commit c12cebd635
1 changed files with 12 additions and 1 deletions
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13
share/man/man4/tcp.4
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@ -34,7 +34,7 @@
.\" From: @(#)tcp.4 8.1 (Berkeley) 6/5/93
.\" $FreeBSD$
.\"
.Dd January 21, 2016
.Dd May 19, 2016
.Dt TCP 4
.Os
.Sh NAME
@ -530,6 +530,17 @@ Defaults to 60 seconds.
Enable support for TCP Explicit Congestion Notification (ECN).
ECN allows a TCP sender to reduce the transmission rate in order to
avoid packet drops.
Settings:
.Bl -tag -compact
.It 0
Disable ECN.
.It 1
Allow incoming connections to request ECN.
Outgoing connections will request ECN.
.It 2
Allow incoming connections to request ECN.
Outgoing connections will not request ECN.
.El
.It Va ecn.maxretries
Number of retries (SYN or SYN/ACK retransmits) before disabling ECN on a
specific connection.