[tor-relays] Why does my relay often appears offline in Metrics and should I be worry?

[Clément Février]

On 19/04/2020 02:37, Sebastian Hahn wrote:
>> On 19. Apr 2020, at 02:25, Roger Dingledine <arma at torproject.org> wrote:
>>
>> On Sat, Apr 18, 2020 at 10:16:34AM +0200, Clément Février wrote:
>>> The issue is back. After more than 3 days, the relay appears offline.
>>> All flags are gone in nyx. There is a bug.
>>
>> I believe there is something wrong with your ipv6 port.
> 
> indeed there is something wrong. I am voting against you because I cannot
> reach you via IPv6. A traceroute to you seems to die somewhere inside OVH:
> 
> 11  th2-dsl1-a1.fr.eu (2001:41d0::b76)  12.944 ms be45.th2-dsl1a-n93.fr.eu (2001:41d0::b72)  13.035 ms  13.103 ms
> 12  2001:41d0:fde0:80::30 (2001:41d0:fde0:80::30)  12.637 ms  12.595 ms  12.549 ms
> 13  2001:41d0:fecf:8900:5ee2:8cff:fe99:f106 (2001:41d0:fecf:8900:5ee2:8cff:fe99:f106)  22.724 ms  22.759 ms  21.971 ms
> 14  2001:41d0:fecf:8900:5ee2:8cff:fe99:f106 (2001:41d0:fecf:8900:5ee2:8cff:fe99:f106)  3029.525 ms !H  3022.011 ms !H  3022.124 ms !H
> 
>> So I would suggest removing the ipv6 stuff for a while and see if things
>> get better for you.
>>
>> And then also exploring why your ipv6 address is not consistently
>> routable, or not consistently reachable, or whatever else is going wrong
>> with it.
> 
> That seems quite worthwhile to figure out. Basically, your computer
> isn't really online right now ;)

It seems indeed there is something wrong with OVH support of IPv6. I
tried few times to test IPv6 on https://bridges.torproject.org/scan/
and just by the time of writing this email, I got both positive and
negative results. It is very random because I'm seeing IPv6 connections
in nyx.

The IP 2001:41d0:fecf:8900:5ee2:8cff:fe99:f106 corresponds to the router
provided by OVH (it is a very crappy one a Zyxel VMG8823-B50B where the
interface is so buggy). I'll contact them to solve this issue.

In the mean time, I'll remove IPv6 from torrc.

Thank you all for your answers!
Cheers,
Clèm