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 TCP keep-alive time:

This represents the time interval between the last data transmission and keep-alive packet

submissions by the Pro Series. These “keep-alive” messages are sent to the remote host to

confirm that the session is still open. The default time value is 15 sec.

 TCP “keep-alive” probes:

This represents how many “keep-alive” probes will be sent to the remote host, until it decides that

the connection is dead. Multiplied with the “TCP ‘keep-alive’intervals”, this gives the time that a

link is forced to close after a “keep-alive”packet has been sent for the first time. The default is 3

times

 TCP keep-alive intervals:

This represents the waiting period until a “keep-alive” packet is retransmitted. The default value is

5 seconds.

By default, the Pro Series will send the keep-alive packets 3 times with 5 seconds interval after 15

seconds have elapsed since the time when there’s no data transmitted back and forth.

Figure 3-13 TCP keep-alive configuration

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