Alex Le Heux on IPv6 proposals [alexlh at Re: Links about IPv6 in Tor]

coderman coderman at
Thu Jul 24 18:00:37 UTC 2008

> ----- Forwarded message from Alex Le Heux <alexlh at> -----
> ...
> Final remark
> I believe Tor makes sure it picks the nodes from different /16s. In
> IPv6 you could employ a similar strategy...
> The disadvantage of picking /32 is that all direct end-user
> assignments will then be lumped together, while all these assignments
> to seperate organistions would come from a handfull of /32s.
> The disadvantage of picking /48 is that nearly all "normal" end-users
> will be in ISP aggregated space, so you might end up with the entire
> path consisting of nodes living in a single ISP.

this is a situation where classification by AS number would make more
sense.  given the widely varying prefixes used, as Alex points out
above, any prefix selection is going to be less effective than
desired, and probably vary significantly as IPv6 deployment increases
(with new players possibly using longer or shorter prefix for customer
assignment, etc).

a rough look here:
seems to support an AS level classification as best suited.

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