On CentOS 5.10 I’m trying to add static IPv6 route via external GW (6::a0c:34a) as follows:
ip -6 route add 12::/64 via 6::a0c:34a dev eth1
The above returns a RTNETLINK answers: Invalid argument error.
Now if I try the same but change the GW addr to 2006::a0c:34a
ip -6 route add 12::/64 via 2006::a0c:34a dev eth1
everything works fine.
You cannot add a route whose gateway is an invalid IP address. If you try, you receive the
Invalid argument error.
(But you can add routes to invalid IP address ranges. This is to support bogon handling, blackholing, and various other oddball scenarios that you should not normally have to deal with.)
To resolve this problem, renumber your network so that all hosts have valid IPv6 addresses.
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.