netipv4tcp keepalive probes

TCP Keepalive probes are a mechanism used to determine whether a TCP connection is still active or has been lost. When a TCP connection is idle, there is no data being transmitted between the two endpoints. In such cases, the TCP keepalive mechanism is activated. The net.ipv4.tcp_keepalive_probes parameter determines the number of TCP keepalive probes that will be sent to the remote endpoint before the connection is considered lost. By default, this value is set to 9, which means that if there is no response to 9 consecutive keepalive probes, the connection is considered lost. This value can be adjusted based on the specific needs of the application and the network environment. Increasing the number of probes can help to ensure that the connection is not prematurely closed, while reducing the number of probes can help to conserve network resources