Anycast DNS outage (connection times out)

Yes, as mentioned in the description.

I’ve been using NextDNS on my server to do some experiments. 

NextDNS Update from Hetzner:

It looks like the DNS server are blocking your server IP address. We are able to reach all IPs from Helsinki without any issues. We aren't able to solve this issue. 

Please contact the owner of this service directly. 

HOST: hel1                        Loss%   Snt   Last   Avg  Best  Wrst StDev
 1.|-- static.88-198-**-**.clie  0.0%    20   18.4  17.4  10.2  27.6   4.4
 2.|-- ddos-mitigation.dc1.hel1.  0.0%    20    0.2   0.2   0.2   0.3   0.0
 3.|-- juniper4.dc1.hel1.hetzner  0.0%    20    0.6   0.4   0.4   0.6   0.1
 4.|-- ???                       100.0    20    0.0   0.0   0.0   0.0   0.0
 5.|-- ???                       100.0    20    0.0   0.0   0.0   0.0   0.0
 6.|-- po-31.lag.mow01.ru.misaka  0.0%    20   35.4  35.4  35.3  35.6   0.1
7.|-- dns1.nextdns.io 0.0% 20 36.2 36.2 36.1 36.3 0.0

HOST: hel1                        Loss%   Snt   Last   Avg  Best  Wrst StDev
 1.|-- static.88-198-**-**.clie  0.0%    20   12.2  19.4   4.3  62.0  12.0
 2.|-- ddos-mitigation.dc1.hel1.  0.0%    20    0.4   0.3   0.2   0.4   0.1
3.|-- core52.sto.hetzner.com 0.0% 20 6.7 6.7 6.5 7.0 0.1
4.|-- core51.ams.hetzner.com 0.0% 20 27.2 27.1 27.0 27.4 0.1
5.|-- core10.ams.hetzner.com 0.0% 20 27.1 27.2 27.1 27.3 0.1
6.|-- b901f0cc.ptr.era-ix.net 0.0% 20 28.0 32.9 27.6 58.7 9.4
 7.|-- ???                       100.0    20    0.0   0.0   0.0   0.0   0.0
 8.|-- ???                       100.0    20    0.0   0.0   0.0   0.0   0.0
 9.|-- ???                       100.0    20    0.0   0.0   0.0   0.0   0.0
10.|-- dns2.nextdns.io 0.0% 20 27.6 27.7 27.6 28.3 0.2

Is there any rate-limiting in place?

sefidel Upon further investigation I've found that `dns.nextdns.io` is reachable via IPv4, but not IPv6.

# mtr -s 1000 -r -c 1 dns.nextdns.io -4
Start: 2024-06-02T09:47:48+0000
HOST: cobalt                      Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- _gateway                   0.0%     1    0.7   0.7   0.7   0.7   0.0
  2.|-- core32.hel1.hetzner.com    0.0%     1    0.8   0.8   0.8   0.8   0.0
  3.|-- juniper4.dc1.hel1.hetzner  0.0%     1    0.6   0.6   0.6   0.6   0.0
  4.|-- 212.133.6.1                0.0%     1    1.6   1.6   1.6   1.6   0.0
  5.|-- ae1.3107.ear3.stk2.neo.co  0.0%     1    7.3   7.3   7.3   7.3   0.0
  6.|-- 212.133.1.90               0.0%     1    7.3   7.3   7.3   7.3   0.0
  7.|-- unn-156-146-32-149.cdn77.  0.0%     1    7.2   7.2   7.2   7.2   0.0
  8.|-- dns.nextdns.io             0.0%     1    7.2   7.2   7.2   7.2   0.0

# mtr -s 1000 -r -c 1 dns.nextdns.io -6
Start: 2024-06-02T09:48:00+0000
HOST: cobalt                      Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- 2a01:4f9::a:2:b            0.0%     1    0.8   0.8   0.8   0.8   0.0
  2.|-- core31.hel1.hetzner.com    0.0%     1    0.7   0.7   0.7   0.7   0.0
  3.|-- core52.sto.hetzner.com     0.0%     1    7.3   7.3   7.3   7.3   0.0
  4.|-- core3.sto.hetzner.com      0.0%     1    7.2   7.2   7.2   7.2   0.0
  5.|-- netnod-ix-ge-a-sth-1500.a  0.0%     1    7.3   7.3   7.3   7.3   0.0
  6.|-- 2a00:11c0:2b:2::           0.0%     1    7.0   7.0   7.0   7.0   0.0
  7.|-- ???                       100.0     1    0.0   0.0   0.0   0.0   0.0

sefidel Nevermind, both v4 and v6 is unreachable.

I've tried `ping.nextdns.io` with a VPN connection to the server, and it seems like only anycast addresses are erroring out.

NextDNS I see. I’ll wait for the investigation to finish, then.