tune_TCP_stack

• AIX TCP_KEEPIDLE
  • Description: The keepAlive packet ensures that a connection stays in an active/ESTABLISHED state.
  • How to view or set: Use the no command to determine the current value or to set the value. The change is effective until the next time you restart the machine. To permanently change the value, add the no command to the /etc/rc.net directory. For example:

              /usr/bin/no -o tcp_keepidle=600 
              

  • Default value: 14400 half seconds (2 hours).
  • Recommended value: 600 half seconds (5 minutes).
• TCP_KEEPINTVL
  • Description: Specifies the interval between packets that are sent to validate the connection.
  • How to view or set: Use the following command to set the value to 5 seconds:

              /usr/bin/no -o tcp_keepintvl=10
              

  • Default value: 150(1/2 seconds)
  • Recommended value: 10(1/2 seconds)
• TCP_KEEPINIT
  • Description: Specifies the initial timeout value for TCP connection.
  • How to view or set: Use the following command to set the value to 20 seconds:

              /usr/bin/no -o tcp_keepinit=40
              

  • Default value: 150(1/2 seconds)
  • Recommended value: 40(1/2 seconds)