Write a proposal that enables bridges and relays to advertise their IPv6 address
Proposal 186 describes how bridges and relays can advertise multiple address/port combinations for their ORPort. We need that as a prerequisite for implementing IPv6 in Tor.
This ticket is about writing the proposal, not about implementing it. I'm adding this ticket to the December milestone of sponsor G, so that we remember this proposal is one of the deliverables.