diff options
Diffstat (limited to 'share/man/man4/tcp.4')
| -rw-r--r-- | share/man/man4/tcp.4 | 78 |
1 files changed, 72 insertions, 6 deletions
diff --git a/share/man/man4/tcp.4 b/share/man/man4/tcp.4 index e2d4ad3..aa2755e 100644 --- a/share/man/man4/tcp.4 +++ b/share/man/man4/tcp.4 @@ -38,7 +38,7 @@ .\" From: @(#)tcp.4 8.1 (Berkeley) 6/5/93 .\" $FreeBSD$ .\" -.Dd November 14, 2011 +.Dd March 7, 2012 .Dt TCP 4 .Os .Sh NAME @@ -146,6 +146,65 @@ connection. See .Xr mod_cc 4 for details. +.It Dv TCP_KEEPINIT +This write-only +.Xr setsockopt 2 +option accepts a per-socket timeout argument of +.Vt "u_int" +in seconds, for new, non-established +.Tn TCP +connections. +For the global default in milliseconds see +.Va keepinit +in the +.Sx MIB Variables +section further down. +.It Dv TCP_KEEPIDLE +This write-only +.Xr setsockopt 2 +option accepts an argument of +.Vt "u_int" +for the amount of time, in seconds, that the connection must be idle +before keepalive probes (if enabled) are sent for the connection of this +socket. +If set on a listening socket, the value is inherited by the newly created +socket upon +.Xr accept 2 . +For the global default in milliseconds see +.Va keepidle +in the +.Sx MIB Variables +section further down. +.It Dv TCP_KEEPINTVL +This write-only +.Xr setsockopt 2 +option accepts an argument of +.Vt "u_int" +to set the per-socket interval, in seconds, between keepalive probes sent +to a peer. +If set on a listening socket, the value is inherited by the newly created +socket upon +.Xr accept 2 . +For the global default in milliseconds see +.Va keepintvl +in the +.Sx MIB Variables +section further down. +.It Dv TCP_KEEPCNT +This write-only +.Xr setsockopt 2 +option accepts an argument of +.Vt "u_int" +and allows a per-socket tuning of the number of probes sent, with no response, +before the connection will be dropped. +If set on a listening socket, the value is inherited by the newly created +socket upon +.Xr accept 2 . +For the global default see the +.Va keepcnt +in the +.Sx MIB Variables +section further down. .It Dv TCP_NODELAY Under most circumstances, .Tn TCP @@ -196,8 +255,10 @@ or the internal send buffer is filled. .It Dv TCP_MD5SIG This option enables the use of MD5 digests (also known as TCP-MD5) on writes to the specified socket. -In the current release, only outgoing traffic is digested; -digests on incoming traffic are not verified. +Outgoing traffic is digested; +digests on incoming traffic are verified if the +.Va net.inet.tcp.signature_verify_input +sysctl is nonzero. The current default behavior for the system is to respond to a system advertising this option with TCP-MD5; this may change. .Pp @@ -296,17 +357,21 @@ The Maximum Segment Lifetime, in milliseconds, for a packet. Timeout, in milliseconds, for new, non-established .Tn TCP connections. +The default is 75000 msec. .It Va keepidle Amount of time, in milliseconds, that the connection must be idle before keepalive probes (if enabled) are sent. +The default is 7200000 msec (2 hours). .It Va keepintvl The interval, in milliseconds, between keepalive probes sent to remote machines, when no response is received on a .Va keepidle probe. -After -.Dv TCPTV_KEEPCNT -(default 8) probes are sent, with no response, the connection is dropped. +The default is 75000 msec. +.It Va keepcnt +Number of probes sent, with no response, before a connection +is dropped. +The default is 8 packets. .It Va always_keepalive Assume that .Dv SO_KEEPALIVE @@ -497,6 +562,7 @@ address. .Xr intro 4 , .Xr ip 4 , .Xr mod_cc 4 , +.Xr siftr 4 , .Xr syncache 4 , .Xr setkey 8 .Rs |
