Gateway: The gateway address or '* ' if none set.
Flags:
U (route is up)
H (target is a host)
G (use gateway)
R (reinstate route for dynamic routing)
D (dynamically installed by daemon or redirect)
M (modified from routing daemon or rederict)
! (reject route)
Ref: Number of references to this route. (Not used in
the Linux kernel.)
Use: Count of lookups for the route.
If: Interface to which packets for this route will be
sent.
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