iproute2: ip: RTNETLINK answers: Invalid argument

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# ip -6 route add default via 2002:4340:3:2b12:FF:FF:FF:FF  dev eth0
RTNETLINK answers: Invalid argument

We cannot add a route whose gateway is an invalid IP address.
The network address is always the first IP address in a subnet.

In the above example, the first four blocks 2002:4340:3:2b12 represent the IP, and the next four blocks FF:FF:FF:FF represent the subnet.
The first IP in that block would be: 2002:4340:3:2b12:0:0:0:0.


# ip -6 route add default via 2002:4340:3:2b12:0:0:0:0  dev eth0