Draytek Vigor3900 User Manual page 416

Destination
Gateway
Genmask
Flags
Metric
Iface
system will display the records relating to the keyword.
Display the destination IP address for various routings.
Display the default gateway.
Display the subnet mask for various routings.
Display the flag of the routing entry. Possible flags include:
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 redirect)
A (installed by addrconf)
C (cache entry)
! (reject route)
Display the distance to the target (usually counted in hops).
It may be needed by routing daemons.
Display the direction of such route represented with
LAN/WAN profile (starting from LAN/WAN profile to
LAN/WAN profile).
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Vigor3900 Series User's Guide