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I have 2 Ubuntu machines one acting as IPv6 wireless router (running hostap and radvd on wlan0) and the other is connected to that router. the router wlan0 interface has the address 2001:db8:1:1::1/64 and the host has the address 2001:db8:1:1::2/64 on wlan0 which is connected to ap1 provided by the router. On wireshark, I can see the router advertisements at the router and the host.

when I ping 2001:db8:1:1::2 at the router it says that Destination unreachable: Address unreachable and I can see the neighbour solicitation and advertisement messages exchange.

When I ping 2001:db8:1:1::1 at the host it says the same Destination unreachable: Address unreachable and I can see the neighbour solicitation message only.

Any idea?

Also, I have tried to do the following into the router

sudo ip -6 neigh add 2001:db8:1:1::2 lladdr 64:50:03:ec:cc:ss dev wlan0
sudo ip -6 neigh add 2001:db8:1:1::1 lladdr 64:50:03:ec:cc:ff dev wlan0

Then, when I ping I can see the echo request and reply exchange in wireshark only but I cannot see that at the command line, rather it says no packets have been received!

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Your question sounds similar to askubuntu.com/q/256138/236, but they also look for a good answer. –  qbi Feb 25 '13 at 14:11

1 Answer 1

IPv6 address range 2001:db8::/32 is reserved for documentation only and packets with these addresses should never exist on a network. All routers must discard packet with such addresses. Use another address range, e.g. Unique LocaL Addresses fd00::/8 (RFC 4193). If you want to get connection to internet, ask your provider for an ipv6-address-prefix.

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