TCP: Explanation of differentTCP timers

Updated -

The following code snippet from ss shows the different TCP timers. From iproute-4.11.0-0.el7:

misc/ss.h:

    1983 static void tcp_timer_print(struct tcpstat *s)
    1984 {
    1985         static const char * const tmr_name[] = {
    1986                 "off",
    1987                 "on",
    1988                 "keepalive",
    1989                 "timewait",
    1990    ...

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