Add support for relays without an IPv4 address

A relay with only IPv6 address(es) doesn't work for several reasons. That's OK for quite a while -- we probably don't want a network with relays which can connect only to a (smallish) subset of the other routers.

But there are also limitations in the code today making a relay use the mandatory IPv4 address in ways it shouldn't have to. An example is a bridge requiring that an IpV4 address is configured (but not necessarily being used) in order to work.

This enhancement ticket collects the kind of bugs which are not strictly showstoppers for a mixed IPv4/IPv6 network to function but which should be fixed anyway.

changed milestone to %Tor: unspecified

added component::core tor/tor ipv6 milestone::Tor: unspecified non-clique owner::ln5 priority::medium severity::normal status::new tor-relay type::enhancement labels

Trac:
Milestone: N/A to Tor: 0.2.4.x-final

Trac:
Keywords: ipv6 deleted, ipv6 tor-relay added

Trac:
Component: Tor Relay to Tor

Trac:
Milestone: Tor: 0.2.4.x-final to Tor: 0.2.5.x-final

Trac:
Milestone: Tor: 0.2.5.x-final to Tor: 0.2.???

Any progress on this? It appears that this just keeps getting pushed forward indefinitely.

I have bandwidth and resources to spare, but public IPv4 addresses are getting scarce, and asking people to sacrifice a public v4 address for tor - or, perish the thought, host tor on the same machine next to other services - is difficult.

Trac:
Username: lva

Trac:
Username: kwadronaut
Cc: N/A to kwadronaut@chocovax.net

Trac:
Username: pterjan
Cc: kwadronaut@chocovax.net to kwadronaut@chocovax.net, pterjan

Trac:
Cc: kwadronaut@chocovax.net, pterjan to kwadronaut@chocovax.net, pterjan, teor

lva, I'm starting work on bootstrapping over IPv6. We'll likely implement it in clients first.

Unfortunately, tor assumes relays are fully-connected, and so an IPv6-only relay would cause path building to fail when it couldn't connect to an IPv4-only relay.

Trac:
Sponsor: N/A to N/A
Severity: N/A to Normal

Milestone renamed

Trac:
Milestone: Tor: 0.2.??? to Tor: 0.3.???

Finally admitting that 0.3.??? was a euphemism for Tor: unspecified all along.

Trac:
Keywords: ipv6 tor-relay deleted, tor-relay, ipv6, tor-03-unspecified-201612 added
Milestone: Tor: 0.3.??? to Tor: unspecified

Trac:
Username: rathann
Reviewer: N/A to N/A
Cc: kwadronaut@chocovax.net, pterjan, teor to kwadronaut@chocovax.net, pterjan, teor, dominik@greysector.net

Remove an old triaging keyword.

Trac:
Keywords: tor-03-unspecified-201612 deleted, N/A added

Trac:
Keywords: tor-relay deleted, tor-relay non-clique added

mentioned in issue #15228 (moved)

mentioned in issue #17060 (moved)

mentioned in issue #17066 (moved)

mentioned in issue #17726 (moved)

moved to tpo/core/tor#5788 (closed)

mentioned in issue tpo/core/tor#17726 (closed)