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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_interval60000 (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.mslwhich gets the result: net.inet.tcp.msl: Maximum segment lifetime net.inet.tcp.msl: 30000On 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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