Timeout and Server failed resolving one domain name with some of NextDNS servers
Domain name inform.pucp.edu.pe
Mikrotik generally resolves this name, sometimes after several attempts.
Windows and Android NextDNS clients don't resolve.
I tested Windows client with nslookup, it either fails with timeout or gives "Server failed". Increasing timeout to 10 seconds doesn't help.
Maybe because the clients use different addresses for dns.nextdns.io?
Mikrotik is configured according to my setup page and so has static DNS records for dns.nextdns.io with addresses 45.90.*.
I don't know which addresses Windows and Android clients use. But Google's DNS (and NextDNS itself) resolve dns.nextdns.io to different addresses: 32.252.*.
So, looks like the problem exists on one NextDNS server but not on the other.
16 replies
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The domain works fine on me. The only problem is that it only has http not https and some browsers give warnings and some might not working depending on settings.
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I use DoH, DoT and DoQ with AdGuard on Android and secure DNS (DoH) in Brave and Opera. But it doesn't matter, I tried with Tor and with VPN on Opera. Works all the time.
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losnad As I pointed out in my report, the issue happens using one NextDNS server but not the other. So, it really does matter. Unless you say specifically what NextDNS servers your clients use, or, at least, which address dns.nextdns.io is resolved to, your comments don't add anything new to my issue report.
Tor doesn't use NextDNS, and I don't have a problem in Tor too.
Actually, I hoped for an answer from NextDNS's support. But looks that it's the wrong place to ask for support.. -
Basil Peace What is the full IP address of the failing NextDNS server? Without knowing this no one can check, as different locations will have two different dns servers and it will be “pot luck” to find the problematic one.
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R P M failing: 37.252.255.23 and .39
working: 45.90.28.224 and .30.224
BTW, is there a specific reason why the setup page says to use one address on a router while NextDNS client uses another one?
Are IP addresses tied to specific configurations? Or I can use whatever I can/want?
I suspect that 37.252.255.0/24 is split DNS for my location, so I'd better use it for my router too (if it'd worked).
Or should I add 45.90.28.224 dns.nextdns.io to my hosts file since this is the address mentioned in setup? Documentation doesn't say this is necessary. -
Basil Peace 45.90.* IPs are as @Dmytro said Anycast addresses.
37.252.255.23 & .39 appear to be offline and not accepting any dns requests. IPs are owned by Anexia who are a peering partner of NextDNS.
Can you try ping.nextdns.io on the problem devices and post back the results here.
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R P M Hey, as an aside, how do you know that those IPs are Anexia and more importantly how can I find which IPs those hosts from ping.nextdns.io have because edis-bud is lowest latency and maybe I would want to try it?
edis-bud 8 ms (ultralow2)
■ anexia-vie 15 ms (anycast2)
exoscale-vie 16 ms
enahost-bts 16 ms
anexia-beg 21 ms
anexia-bts 22 ms
zepto-prg 23 ms (anycast1)
edis-zag 24 ms
edis-beg 27 ms
anexia-buh 30 ms
anexia-bud 30 ms (ultralow1)
EDIT: on second thought, maybe I'm misinterpreting the results, it seems to be a traceroute instead! So my question doesn't make sense now, whoops :)
Also
https://dns.nextdns.io/infoshows:locationName " 
Budapest, Hungary"pop "edis-bud" rtt 7619 PoP=? point of P... ?
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Emanuel A simple WHOIS lookup of the IP addresses shows up as anexia.
ping.nextdns.io is not a traceroute, the ping times are just ordered lowest to highest.
To switch to edis-bud, how have you setup to use NextDNS?
PoP? Point of Presence would be my guess.
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R P M I've set it up using the info provided on my.nextdns.io/$MYID/setup :
Linked IP
If you are unable to set up NextDNS using our apps, DNS-over-TLS, DNS-over-HTTPS or IPv6, then use the DNS servers below and link your IP. This is mostly for use on home networks and not recommended on mobile.
DNS Servers
45.90.28.230
45.90.30.230
I use Automate app to make the linked ip update via https request when wifi turns on.
That "edis-bud" from the pop above confused me, it makes sense the ping result is not a traceroute and they're sorted, thanks!
Maybe these are the hostnames for the ping info ? via uMatrix addon:
yup I'm getting 9ms ping on edis-bud:
194.71.130.182 ipv4-edis-bud-1.edge.nextdns.io
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can't edit post anymore, but wanted to add this has the same IP as edis-bud (edge) above:
194.71.130.182 ipv4.dns2.nextdns.io
So maybe it makes sense to use it, instead of the ones they give in setup?:
45.90.28.230
45.90.30.230
217.146.4.63 ipv4.dns1.nextdns.io
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R P M Problem device, Windows client:
■ anexia-led 16 ms (ultralow1)
hetzner-hel 19 ms
zepto-mow 25 ms
anexia-mow 26 ms (ultralow2)
anexia-sto 29 ms (anycast2)
wavecom-tll 34 ms
tavu-hel 35 ms
zepto-fra 44 ms (anycast1)
melbicom-rix 49 ms
edis-rix 50 ms
edis-vno 74 ms
melbicom-vno 83 ms
Android works now, with ■ zepto-fra. Previously either Android used a different server, or I was too impatient.
PC behind router works. Ping either prints ■ before zepto-mow, or doesn't print ■ at all.
P.S. Version of Windows client is the latest 2.2.1. -
Emanuel Using the IP address setup you are limited to the Anycast servers. It’s not a good idea to set it to the IP address of dns2.nextdns.io because if the server has maintenance or offline for whatever reason, you could end up with no connection to the internet.
If you can use the NextDNS apps on your devices or other DoH/DoT clients then you would be able to use that edis-bud automatically.
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Basil Peace When you get no box for any on ping.nextdns.io are there any marked in bold?
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R P M zepto-mow and vultr-ams are bold. My router is multi-WAN, and I have two ISPs, so I don't think missing box is a problem. I have some simple balancing+reserving algorithm in there, but it could be incompatible with ping.nextdns.io.
Anyway, this setup (generally) doesn't have the problem resolving inform.pucp.edu.pe. Which this issue is about.
The problematic device is the one using anexia-led.
> 37.252.255.23 & .39 appear to be offline and not accepting any dns requests. IPs are owned by Anexia who are a peering partner of NextDNS
Maybe it's behind a firewall and doesn't accept requests from your location? Considering current situation.
> If you can use the NextDNS apps on your devices or other DoH/DoT clients then you would be able to use that edis-bud automatically
I already use the NextDNS app, but either it chooses the wrong server, or there is a problem with that specific server.
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45.90.28.225
45.90.30.225 is not working nor the ipv6 ip on the router, it's not working since July 23, 3pm.
Content aside
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