Changing the following parameters is not recommended.
This ipadm parameter sets a probe interval that is first sent out after a TCP connection is idle on a system-wide basis.
Solaris supports the TCP keep-alive mechanism as described in RFC 1122. This mechanism is enabled by setting the SO_KEEPALIVE socket option on a TCP socket.
If SO_KEEPALIVE is enabled for a socket, the first keep-alive probe is sent out after a TCP connection is idle for two hours, the default value of the tcp_keepalive_interval parameter. If the peer does not respond to the probe after eight minutes, the TCP connection is aborted. For more information, refer to _rexmit_interval_initial.
You can also use the TCP_KEEPALIVE_THRESHOLD socket option on individual applications to override the default interval so that each application can have its own interval on each socket. The option value is an unsigned integer in milliseconds. See also tcp (7P) .
2 hours
10 seconds to 10 days
Unsigned integer (milliseconds)
Yes
Do not change the value. Lowering it may cause unnecessary network traffic and might also increase the chance of premature termination of the connection because of a transient network problem.
Unstable
Specifies the default total retransmission timeout value for a TCP connection. For a given TCP connection, if TCP has been retransmitting for _ip_abort_interval period of time and it has not received any acknowledgment from the other endpoint during this period, TCP closes this connection.
For TCP retransmission timeout (RTO) calculation, refer to RFC 1122, 4.2.3. See also _rexmit_interval_max.
5 minutes
500 milliseconds to 1193 hours
Yes
Do not change this value. See _rexmit_interval_max for exceptions.
Unstable
Specifies the default initial retransmission timeout (RTO) value for a TCP connection. Refer to Per-Route Metrics for a discussion of setting a different value on a per-route basis.
1,000 milliseconds
1 millisecond to 20,000 milliseconds
Yes
Do not change this value. Lowering the value can result in unnecessary retransmissions.
Unstable
Defines the default maximum retransmission timeout value (RTO). The calculated RTO for all TCP connections cannot exceed this value. See also _ip_abort_interval.
6,000 milliseconds
1 millisecond to 7,200,000 milliseconds
Yes
Do not change the value in a normal network environment.
If, in some special circumstances, the round-trip time (RTT) for a connection is about 10 seconds, you can increase this value. If you change this value, you should also change the _ip_abort_interval parameter. Change the value of _ip_abort_interval to at least four times the value of _rexmit_interval_max.
Unstable
Specifies the default minimum retransmission time out (RTO) value. The calculated RTO for all TCP connections cannot be lower than this value. See also _rexmit_interval_max.
200 milliseconds
1 millisecond to 7,200,000 milliseconds
Yes
Do not change the value in a normal network environment.
TCP's RTO calculation should cope with most RTT fluctuations. If, in some very special circumstances, the round-trip time (RTT) for a connection is about 10 seconds, increase this value. If you change this value, you should change the _rexmit_interval_max parameter. Change the value of _rexmit_interval_max to at least eight times the value of _rexmit_interval_min.
Unstable
Specifies a constant added to the calculated retransmission time out value (RTO).
0 milliseconds
0 to 7,200,000 milliseconds
Yes
Do not change the value.
When the RTO calculation fails to obtain a good value for a connection, you can change this value to avoid unnecessary retransmissions.
Unstable
If this parameter is set to 1, and the window scale option is enabled for a connection, TCP also enables the timestamp option for that connection.
1 (enabled)
0 (disabled) or 1 (enabled)
Yes
Do not change this value. In general, when TCP is used in high-speed network, protection against sequence number wraparound is essential. Thus, you need the timestamp option.
Unstable
Controls the default minimum receive window size. The minimum is _recv_hiwat_minmss times the size of maximum segment size (MSS) of a connection.
8
1 to 65,536
Yes
Do not change the value. If changing it is necessary, do not change the value lower than 4.
Unstable