On Fri, Sep 27, 2013 at 03:15:34PM +0200, Mark Tinka wrote: > If you need SLAAC, a /64 is your only option. > > If you don't need SLAAC on your network segment, and you > don't need a /64, then you can use a longer prefix length.
All the IPv6 guys I asked said to never do that. I can see when I would use a much smaller subnet e.g. for building a tunnel or CARP, but that's a very special case. While /64 per LAN segment is wasteful ( /80 or even /96 for end users might have been enough), we're stuck with it for a long while. This is not all bad, you can use the private part of /64 to encode and transport information across the Internet, e.g geographic position (WGS 84 fixes), etc.. In general the large size of private addresses allows novel uses like cjdns (public key as address identity). I'm happy Google reports 2% IPv6 penetration, while still appearing to look exponential http://www.google.com/ipv6/statistics.html
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