On Tue, 3 Oct 2017 09:53:46 -0400 teor teor2345@gmail.com wrote:
For interposing dual-protocoled nodes along the way, how many do therehave 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.