pragmatism first

blackhole

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This manual	Reference	Other manuals
blackhole(4freebsd)	referred by	tcp(4freebsd) \| udp(4freebsd)
blackhole(4freebsd)	refer to	ip(4freebsd) \| sctp(4freebsd) \| sysctl(8) \| tcp(4freebsd) \| udp(4freebsd)