A keepalive message in Internet communications is a message sent among nodes when no data traffic has been detected for a given period of time and thus keeps the link alive.
To set the tcp_keepintvl, tcp_keepidle, and tcp_keepinit parameters on AIX, it is recommended to use the no command:
no -o tcp_keepintvl 150
no -o tcp_keepidle 14400
no -o tcp_keepinit 150
(The following values are examples and may not work in your situation.)
To list the network parameters, use the commands:
no -a
no -a | grep tcp_keep (to list only keepalive parameters)
The values for these intervals are in half-seconds.
The parameters are documented as follows:
- tcp_keepintvl
Specifies the interval, measured in half seconds, between packets sent to validate the connection. The default is 150 half seconds (75 seconds). It is a runtime attribute.
- tcp_keepidle
Specifies the length of time to keep the connection active, measured in half seconds. The default is 14,400 half seconds (7200 seconds or 2 hours). It is a runtime attribute.
- tcp_keepinit
Sets the initial timeout value for a tcp connection. This value is defined in 1/2 second units, and defaults to 150, which is 75 seconds. It can be changed to any value with the -o flag. tcp_keepinit is a runtime attribute.
