tcp_tw_recycle (Boolean; default: disabled; Linux 2.4 to 4.11)
Enable fast recycling of TIME_WAIT sockets. Enabling this
option is not recommended as the remote IP may not use
monotonically increasing timestamps (devices behind NAT,
devices with per-connection timestamp offsets). See RFC 1323
(PAWS) and RFC 6191.
tcp_tw_reuse (Boolean; default: disabled; since Linux 2.4.19/2.6)
Allow to reuse TIME_WAIT sockets for new connections when it
is safe from protocol viewpoint. It should not be changed
without advice/request of technical experts.