MSL meaning in Computer Hardware ?

Answer: What is Maximum Segment Lifetime mean?

Maximum segment lifetime is the time a TCP segment can exist in the internetwork system. It is arbitrarily defined to be 2 minutes long.

The Maximum Segment Lifetime value is used to determine the TIME_WAIT interval (2*MSL)

The command that can be used on many Unix systems to determine the TIME_WAIT interval is:

ndd -get /dev/tcp tcp_time_wait_interval

60000 (60 seconds) is a common value.

On FreeBSD systems this description and value can be checked by the command sysctl:

sysctl -d net.inet.tcp.msl sysctl net.inet.tcp.msl

which gets the result:

net.inet.tcp.msl: Maximum segment lifetime net.inet.tcp.msl: 30000

On some Linux systems, this value can be checked by either of the commands below:

sysctl net.ipv4.tcp_fin_timeout cat /proc/sys/net/ipv4/tcp_fin_timeout reference

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