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FORTRAN, "the infantile disorder", by now nearly 20 years old, is hopelessly inadequate for whatever computer application you have in mind today: it is too clumsy, too risky, and too expensive to use. -Edsger W. Dijkstra, SIGPLAN Notices, Volume 17, Number 5
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sysctl -w net.ipv4.icmp_echo_ignore_all=1