Setting TCP timers

You can set the following TCP timers:

• SYN wait timer—TCP starts the SYN wait timer after sending a SYN packet. Within the SYN wait timer if no response is received or the upper limit on TCP connection tries is reached, TCP fails to establish the connection.

• FIN wait timer—TCP starts the FIN wait timer when TCP changes the connection state to FIN_WAIT_2. If no FIN packet is received within the timer interval, TCP terminates the connection. If a FIN packet is received, TCP changes the connection state to TIME_WAIT. If a non-FIN packet is received, TCP restarts the timer, and tears down the connection when the timer expires.

1. Enter system view.

   system-view

2. Set the TCP SYN wait timer.

3. tcp timer syn-timeout time-value

   • By default, the TCP SYN wait timer is 75 seconds.

4. Set the TCP FIN wait timer.

5. tcp timer fin-timeout time-value

   By default, the TCP FIN wait timer is 675 seconds.