DNS resolve problem

Question

Today i couldn't get access to map. I made some digging and found i have problems with resolving tile.openstreetmap.org. In browser i get error "DNS_PROBE_FINISHED_NXDOMAIN". Here is "nslookup" for render.openstreetmap.org (he works ok) and a.tile.openstreetmap.org.

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(sorry for russian text, it says "Non-authoritative answer")

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Online nslookup (Russia) https://2whois.ru/?t=nslookup&data=a.tile.openstreetmap.org&dns_type=a

Root DNS server answer:

Server:     b2.org.afilias-nst.org
Address:    2001:500:48::1#53

Non-authoritative answer:
*** Can't find openstreetmap.org.: No answer

Authoritative answers can be found from:
openstreetmap.org   nameserver = daisy.ns.cloudflare.com.
openstreetmap.org   nameserver = rajeev.ns.cloudflare.com.

DNS server answer:

Server:     daisy.ns.cloudflare.com
Address:    2606:4700:50::adf5:3a5a#53

a.tile.openstreetmap.org    canonical name = tile.geo.openstreetmap.org.

So there is no record type A in DNS server.

Answer 1

The tile are served by cache servers, chosen through GeoDNS. The same request from France :

nslookup a.tile.openstreetmap.org 8.8.8.8
Server:         8.8.8.8
Address:        8.8.8.8#53

Non-authoritative answer:
a.tile.openstreetmap.org        canonical name = tile.geo.openstreetmap.org.
tile.geo.openstreetmap.org      canonical name = france-02.tile.openstreetmap.org.
Name:   france-02.tile.openstreetmap.org
Address: 91.224.148.166

So regarding your last remark, it's normal, you have to recurse on the canonical name.

Some information about the CDN setup is on the wiki. But I can't find much details about the DNS servers involved.

If the issue persist, you might want to reach OWG.

Answer 2

0	I've changed DNS server to 1.1.1.1 (didn't knew about it before) and voilà: And map works well and fast. So there is definitely problem with default google DNS server. permanent link answered 21 Mar '20, 06:35 Legista 21●1●1●3 accept rate: 0%

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