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Describe all current net.inet.tcp MIB variables.

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Submitted by:	jlemon
MFC after:	1 week
This commit is contained in:
Ruslan Ermilov 2001-05-17 17:53:21 +00:00
parent 9286fd701f
commit 4c7bd38fbe
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=76752
1 changed files with 61 additions and 3 deletions
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64
share/man/man4/tcp.4
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@ -207,9 +207,6 @@ as described in RFC 1644.
The default value used for the maximum segment size
.Pq Dq MSS
when no advice to the contrary is received from MSS negotiation.
.It TCPCTL_RTTDFLT
.Pq tcp.rttdflt
The value of the default maximum TCP Round Trip Time.
.It TCPCTL_SENDSPACE
.Pq tcp.sendspace
Maximum TCP send window.
@ -219,6 +216,51 @@ Maximum TCP receive window.
.It tcp.log_in_vain
Log any connection attempts to ports where there is not a socket
accepting connections.
.It tcp.slowstart_flightsize
The number of packets allowed to be in-flight during the
.Tn TCP
slow-start phase on a non-local network.
.It tcp.local_slowstart_flightsize
The number of packets allowed to be in-flight during the
.Tn TCP
slow-start phase to local machines in the same subnet.
.It tcp.msl
The Maximum Segment Lifetime for a packet.
.It tcp.keepinit
Timeout for new, non-established TCP connections.
.It tcp.keepidle
Amount of time the connection should be idle before keepalive
probes (if enabled) are sent.
.It tcp.keepintvl
The interval between keepalive probes sent to remote machines.
After
.Dv TCPTV_KEEPCNT
(default 8) probes are sent, with no response, the connection is dropped.
.It tcp.always_keepalive
Assume that
.Dv SO_KEEPALIVE
is set on all
.Tn TCP
connections, the kernel will
periodically send a packet to the remote host to verify the connection
is still up.
.It tcp.icmp_may_rst
Certain
.Tn ICMP
unreachable messages may abort connections in
.Tn SYN-SENT
state.
.It tcp.do_tcpdrain
Flush packets in the
.Tn TCP
reassembly queue if the system is low on mbufs.
.\"
.\" This option should go away and become the default.
.\"
.It tcp.tcp_lq_overflow
If a connection is dropped due to a listen queue overflow, delete the
cloned route associated with the connection if it does not have any
prior information.
.It tcp.blackhole
If enabled, disable sending of RST when a connection is attempted
to a port where there is not a socket accepting connections.
@ -226,11 +268,27 @@ See
.Xr blackhole 4 .
.It tcp.delayed_ack
Delay ACK to try and piggyback it onto a data packet.
.It tcp.delacktime
Maximum amount of time before a delayed ACK is sent.
.It tcp.newreno
Enable TCP NewReno Fast Recovery algorithm,
as described in RFC 2582.
.It tcp.path_mtu_discovery
Enable Path MTU Discovery
.It tcp.tcbhashsize
Size of the
.Tn TCP
control-block hashtable
(read-only).
This may be tuned using the kernel option
.Dv TCBHASHSIZE
or by setting
.Va net.inet.tcp.tcbhashsize
in the
.Xr loader 8 .
.It tcp.pcbcount
Number of active process control blocks
(read-only).
.El
.Sh ERRORS
A socket operation may fail with one of the following errors returned: