[tor-relays] About relay size

[Roman Mamedov]

On Tue, 3 Oct 2017 09:53:46 -0400
teor <teor2345 at gmail.com> wrote:

> >     For interposing dual-protocoled nodes along the way, how many do there
> > have to be for it to become "not too limiting"?
> 
> This is one of the questions we need researchers to answer.

I can't help but feel you are overcomplicating this.

Clients create a circuit by randomly picking 3 nodes out of the all-nodes
pile, right? If all 3 happen to be IPv6-capable, then the circuit can go over
IPv6 and all is fine. If some of the 3 happen to be IPv6-only while others are
IPv4-only, the whole selection can be thrown away and repeated.

That way IPv6-only relays could get some usage on a totally random basis, with
no compromises and no restraining "of the next hop based on the previous one",
not hurting anonymity. Clients just need to know which nodes are IPv4-only,
IPv6-only or dual-stack, to not attempt unworkable combinations, discarding
them instead.

And as there are more and more dual-stack or IPv6-only relays, the "throw
away" step will be needed less and less often.

-- 
With respect,
Roman