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share/man/man4/tcp.4
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.Ss MIB Variables | .Ss MIB Variables | ||||
The | The | ||||
.Tn TCP | .Tn TCP | ||||
protocol implements a number of variables in the | protocol implements a number of variables in the | ||||
.Va net.inet.tcp | .Va net.inet.tcp | ||||
branch of the | branch of the | ||||
.Xr sysctl 3 | .Xr sysctl 3 | ||||
MIB. | MIB. | ||||
.Bl -tag -width ".Va TCPCTL_DO_RFC1323" | .Bl -tag -width ".Va v6pmtud_blackhole_mss" | ||||
.It Dv TCPCTL_DO_RFC1323 | .It Va rfc1323 | ||||
.Pq Va rfc1323 | |||||
Implement the window scaling and timestamp options of RFC 1323/RFC 7323 | Implement the window scaling and timestamp options of RFC 1323/RFC 7323 | ||||
(default is true). | (default is true). | ||||
.It Va tolerate_missing_ts | .It Va tolerate_missing_ts | ||||
Tolerate the missing of timestamps (RFC 1323/RFC 7323) for | Tolerate the missing of timestamps (RFC 1323/RFC 7323) for | ||||
.Tn TCP | .Tn TCP | ||||
segments belonging to | segments belonging to | ||||
.Tn TCP | .Tn TCP | ||||
connections for which support of | connections for which support of | ||||
.Tn TCP | .Tn TCP | ||||
timestamps has been negotiated. | timestamps has been negotiated. | ||||
As of June 2021, several TCP stacks are known to violate RFC 7323, including | As of June 2021, several TCP stacks are known to violate RFC 7323, including | ||||
modern widely deployed ones. | modern widely deployed ones. | ||||
Therefore the default is 1, i.e., the missing of timestamps is tolerated. | Therefore the default is 1, i.e., the missing of timestamps is tolerated. | ||||
.It Dv TCPCTL_MSSDFLT | .It Va mssdflt | ||||
.Pq Va mssdflt | |||||
The default value used for the maximum segment size | The default value used for the maximum segment size | ||||
.Pq Dq MSS | .Pq Dq MSS | ||||
when no advice to the contrary is received from MSS negotiation. | when no advice to the contrary is received from MSS negotiation. | ||||
.It Dv TCPCTL_SENDSPACE | .It Va sendspace | ||||
.Pq Va sendspace | |||||
Maximum | Maximum | ||||
.Tn TCP | .Tn TCP | ||||
send window. | send window. | ||||
.It Dv TCPCTL_RECVSPACE | .It Va recvspace | ||||
.Pq Va recvspace | |||||
Maximum | Maximum | ||||
.Tn TCP | .Tn TCP | ||||
receive window. | receive window. | ||||
.It Va log_in_vain | .It Va log_in_vain | ||||
Log any connection attempts to ports where there is not a socket | Log any connection attempts to ports where there is not a socket | ||||
accepting connections. | accepting connections. | ||||
The value of 1 limits the logging to | The value of 1 limits the logging to | ||||
.Tn SYN | .Tn SYN | ||||
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