pragmatism first

gre

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gre(4freebsd)	referred by	gif(4freebsd) \| if_gif(4freebsd) \| if_gre(4freebsd) \| if_ipsec(4freebsd) \| me(4freebsd) \| multicast(4freebsd)
gre(4freebsd)	refer to	gif(4freebsd) \| ifconfig(8) \| inet(4freebsd) \| ip(4freebsd) \| me(4freebsd) \| netintro(4freebsd) \| protocols(5) \| sysctl(8)