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Routing table flags

The following table describes the Flags column in the netstat -rn output.

Flag Description
U Up—Route is valid
G Gateway—Route is to a gateway router rather than to a directly connected network or host
H Host name—Route is to a host rather than to a network, where the destination address is a complete address
R Reject—Set by ARP when an entry expires (for example, the IP address could not be resolved into a MAC address)
D Dynamic—Route added by a route redirect or RIP (if routed is enabled)
M Modified—Route modified by a route redirect
C Cloning—A new route is cloned from this entry when it is used
L Link—Link-level information, such as the Ethernet MAC address, is present
S Static—Route added with the route command