[tor-relays] Debugging relays not showing online

[Roger Dingledine]

On Thu, Apr 18, 2019 at 05:52:48PM +0000, Jake Visser wrote:
> I am looking for some help in debugging a strange one....  EO runs ~30ish relays in our /24; but we currently have 4 relays that don't want to play nice and are reporting offline (although look to be online).
> 
> The effected relay IPs are:
> 
> 23.129.64.157
> 23.129.64.164
> 23.129.64.170
> 23.129.64.174

Whenever I see strange issues like this, my first thought is whether
the relay advertises an IPv6 address, yet it's unreachable there.

Tor is pretty good at self-testing its IPv4 addresses, but it just
trusts you that your IPv6 address works.

And then only some of the directory authorities have IPv6 support,
but these days it's a majority of them, so you won't get the Running
flag (i.e. won't be in the consensus) if your advertised IPv6 address
doesn't work.

Hope that does it!
--Roger