diff options
Diffstat (limited to 'share/man/man4/tcp.4')
| -rw-r--r-- | share/man/man4/tcp.4 | 31 |
1 files changed, 26 insertions, 5 deletions
diff --git a/share/man/man4/tcp.4 b/share/man/man4/tcp.4 index d53d8086e8c0..fcfda42908d8 100644 --- a/share/man/man4/tcp.4 +++ b/share/man/man4/tcp.4 @@ -31,7 +31,7 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.Dd January 10, 2025 +.Dd June 27, 2025 .Dt TCP 4 .Os .Sh NAME @@ -780,21 +780,34 @@ Minimum TCP Maximum Segment Size; used to prevent a denial of service attack from an unreasonably low MSS. .It Va msl The Maximum Segment Lifetime, in milliseconds, for a packet. +.It Va msl_local +The Maximum Segment Lifetime, in milliseconds, for a packet when both endpoints +are local. +.Va msl_local +is only used if +.Va nolocaltimewait , +which is deprecated, is zero. .It Va mssdflt The default value used for the TCP Maximum Segment Size .Pq Dq MSS for IPv4 when no advice to the contrary is received from MSS negotiation. -.It Va newcwd +.It Va newcwv Enable the New Congestion Window Validation mechanism as described in RFC 7661. This gently reduces the congestion window during periods, where TCP is application limited and the network bandwidth is not utilized completely. That prevents self-inflicted packet losses once the application starts to transmit data at a higher speed. .It Va nolocaltimewait -Suppress creation of TCP +Suppress the creation of TCP .Dv TIME_WAIT states for connections in which both endpoints are local. +The default is 0. +.Va nolocaltimewait +is deprecated and will be removed in +.Fx 16 . +.Va msl_local +can be used instead. .It Va path_mtu_discovery Enable Path MTU Discovery. .It Va pcbcount @@ -871,10 +884,13 @@ segment is lost (default and maximum is 12). .It Va rexmit_drop_options Drop TCP options from third and later retransmitted SYN segments of a connection. -.It Va rexmit_initial , rexmit_min , rexmit_slop +.It Va rexmit_initial , rexmit_min , rexmit_slop , rexmit_max Adjust the retransmit timer calculation for .Tn TCP . -The slop is +A new connection starts with timer set to +.Va rexmit_initial . +The +.Va rexmit_slop typically added to the raw calculation to take into account occasional variances that the .Tn SRTT @@ -894,6 +910,11 @@ For this reason, we use 200ms of slop and a near-0 minimum, which gives us an effective minimum of 200ms (similar to .Tn Linux ) . The initial value is used before an RTT measurement has been performed. +The +.Va rexmit_min +and +.Va rexmit_max +set minimum and maximum timer values that a connection may have. .It Va rfc1323 Implement the window scaling and timestamp options of RFC 1323/RFC 7323 (default is 1). |