Tuc at T-B-O-H.NET wrote:

        But once I brought it all up, I got :

kernel: nd6_lookup: failed to add route for a 
neighbor(2001:0470:0007:0028::0001), errno=17

With your exact configuration between two 7.0 boxes, I see no indication of this error whatsoever, with the /128 prefix.

        The tunnel came up, was passing traffic, but those messages were
getting out of hand. I tried a prefixlen of 64, and I got:

        ifconfig: ioctl (SIOCAIFADDR): Invalid argument

When I attempted to recreate the tunnel with any prefix length other than 128, the same ifconfig error appeared as above. It appears as though when creating a gif tunnel, the only IPv6 prefix length that is valid as far as ifconfig is concerned is /128 even though the link's prefix is /64 even in 7.

Steve
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