Maintaining idle connections

We recommend that you configure the following keepalive parameters on connection gateway devices to improve connection stability:

• net.ipv4.tcp_keepalive_intvl specifies how often to send keepalive messages after the first one. Set this parameter to 1.
• net.ipv4.tcp_keepalive_probes specifies how many keepalive messages can be sent without a reply before the connection is considered dead. Set this parameter to 10.
• net.ipv4.tcp_keepalive_time specifies how long to wait after the last data packet before sending the first keepalive message. Set this parameter to 900.

To configure keepalive parameters:

1. Open the /etc/sysctl.conf file.
2. Add the following parameter values:

   net.ipv4.tcp_keepalive_intvl = 1

   net.ipv4.tcp_keepalive_probes = 10

   net.ipv4.tcp_keepalive_time = 900

3. Run the following command to update keepalive parameters:

   sudo sysctl -p /etc/sysctl.conf

4. Run the following commands to ensure that parameter values have been applied:

   sudo sysctl net.ipv4.tcp_keepalive_intvl

   sudo sysctl net.ipv4.tcp_keepalive_probes

   sudo sysctl net.ipv4.tcp_keepalive_time

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