What is TCP keepalive time?

What is TCP keepalive time?

The TCP Keepalive Timer feature provides a mechanism to identify dead connections. When a TCP connection on a routing device is idle for too long, the device sends a TCP keepalive packet to the peer with only the Acknowledgment (ACK) flag turned on.

What is TCP connection time?

Tcp Handshake & Connection Time. A TCP connection, also called 3-way Handshake is achieved with SYN, SYN+ACK and ACK packets. From this handshake, we can extract a performance metric called Connection Time (CT), which summarizes how fast session a can be set up between a client and a server over a network.

What is TCP keepalive probes?

TCP keepalive probes provide a method to remove dead sockets and notify applications of unresponsive peers across a TCP connection. Applications could therefore wait indefinitely on a remote peer that has crashed.

What is the purpose of the keepalive message?

A keepalive (KA) is a message sent by one device to another to check that the link between the two is operating, or to prevent the link from being broken.

What is TCP latency?

Latency is the time—measured in milliseconds—a round-trip signal takes to travel a network. Latency is a major factor in TCP/IP performance. TCP, part of the TCP/IP communications protocol, provides end-to-end error checking of data transmission for reliable and sequential exchange of data.

How do I check my keepalive?

Keep-Alive Test Tool

1. About Keep-Alive Test Tool. The Keep-Alive Test tool checks whether keep-alive (persistent HTTP connection) is enabled on the server where the website is hosted.
2. Benefit of Enabling KeepAlive Connection. Keep-Alive helps conserve network resource by using single connection per client.

How do I set TCP timeout?

Move to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters. From the Edit menu select New – DWORD value. Enter a name of InitialRtt and press Enter. Double click the new value and set to the number of milliseconds for the timeout, e.g. 5000 for 5 seconds (the old default was 3 seconds).

What is the difference between TCP_Keepalive_time and TCP_ Keepalive _intvl?

tcp_keepalive_time, the parameter represents the value in seconds for idle time of a connection, before starting TCP keep alive probe. tcp_keepalive_intvl, have value in seconds. The time interval between consecutive keepalive probes. tcp_keepalive_probes, an integer value.

How long does it take for TCP keepalives to send?

Send TCP Keepalives successfully (within 15 minutes), before idle socket timeout (typically 60 or 30 minutes). Make sure TCP Keepalives retry at least as robustly as TCP data retransmission to prevent spurious connection drop.

How can I improve the performance of TCP keepalives?

The goals are three-fold: Send TCP Keepalives more frequently and detect loss of the remote endpoint within 15 minutes. Send TCP Keepalives successfully (within 15 minutes), before idle socket timeout (typically 60 or 30 minutes). Make sure TCP Keepalives retry at least as robustly as TCP data retransmission to prevent spurious connection drop.

What happens to a TCP Keepalive when a socket timeout occurs?

However, in the case of an idle socket timeout, the keepalive may be silently discarded by the device or software that dropped the connection. The TCP stack that sent the keepalive should send retransmissions of the TCP Keepalive until it believes the connection is no longer valid.