TCP_keepalive
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## TCP_keepalive

According to blog.kolargol.eu or www.gnugk.org/ some keepalive settings should be changed to improve reliability.

    # sysctl -w net.ipv4.tcp_keepalive_time="60"
    net.ipv4.tcp_keepalive_time = 60
    # sysctl -w net.ipv4.tcp_keepalive_probes="3"
    net.ipv4.tcp_keepalive_probes = 3
    # sysctl -w net.ipv4.tcp_keepalive_intvl="90"
    net.ipv4.tcp_keepalive_intvl = 90

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