The default timeout value for TCP sessions is typically around 75 seconds. This value is determined by the operating system and can vary depending on the specific implementation.

TCP

TCP is a reliable, connection-oriented protocol that is used to establish a secure connection between two devices on a network. When a connection is established, a timer is started, and if no data is exchanged between the two devices within the specified timeout period, the connection is terminated. This is known as a “keepalive” mechanism and is used to ensure that the connection is still active and to detect any potential issues.

UDP (User Datagram Protocol)

The default timeout value for UDP sessions is typically around 15 seconds. This value is determined by the operating system and can vary depending on the specific implementation.

UDP is a connectionless protocol that is used to send data packets between devices on a network. Unlike TCP, there is no mechanism for maintaining a connection or checking for connectivity. Instead, data is sent in the form of datagrams, and the receiving device must be able to handle the data when it arrives.

ICMP (Internet Control Message Protocol)

The default timeout value for ICMP sessions is typically around 10 seconds. This value is determined by the operating system and can vary depending on the specific implementation.

ICMP is a network protocol that is used to send error messages and operational information about network conditions. It is an integral part of the Internet Protocol (IP) and is used by network devices to communicate with each other. ICMP messages are sent in the form of packets, and the receiving device must be able to handle the data when it arrives.

Overall, the default timeout values for TCP, UDP, and ICMP sessions are determined by the operating system and can vary depending on the specific implementation. These values are used to ensure that connections are active and to detect any potential issues. It is important to note that these values can be adjusted as needed to suit the specific requirements of a network or application.