On Thu, 2021-05-13 at 20:55 -0500, Steven Garner via Pdns-users wrote: > Recently set up PowerDNS Authoritative Server (v 4.4.X) on 3 Ubuntu 20.04 > LTS name servers using MySQL 8 replication as a backend. My master name > server (ns1.opensourceserver.io) and one of the slaves > (ns3.opensourceserver.io) are performing well, but the other slave > (ns2.opensourceserver.io) cannot even be found. > > I am wondering if it might be because of this unexpected result: > > > # netstat -alnp4 | grep pdns > > tcp 0 0 0.0.0.0:53 0.0.0.0:* LISTEN > > 53992/pdns_server > > tcp 0 0 127.0.0.1:59010 127.0.0.1:3306 > > ESTABLISHED 53992/pdns_server > > tcp 0 0 127.0.0.1:59008 127.0.0.1:3306 > > ESTABLISHED 53992/pdns_server > > tcp 0 0 127.0.0.1:59012 127.0.0.1:3306 > > ESTABLISHED 53992/pdns_server > > tcp 0 0 127.0.0.1:59014 127.0.0.1:3306 > > ESTABLISHED 53992/pdns_server > > udp 0 0 0.0.0.0:53 0.0.0.0:* > > 53992/pdns_server > >
The 3306 connections are pdns-server connecting to MySQL. > > dig opensourceserver.io @ns2.opensourceserver.io > > ; <<>> DiG 9.10.6 <<>> opensourceserver.io @ns2.opensourceserver.io > > ;; global options: +cmd > > ;; connection timed out; no servers could be reached > > Your server does actually seem to answer queries from outside ... over TCP. Not so much over UDP. 19:36:00.599475 eth0 Out IP 10.75.105.10.52535 > 207.177.51.156.53: 62512+ [1au] A? ns2.opensourceserver.io. (64) 19:36:00.678967 eth0 In IP 207.177.51.156 > 10.75.105.10: ICMP 207.177.51.156 udp port 53 unreachable, length 36 I get a port unreachable on UDP 53. ANY queries over TCP work, though: $ dig @207.177.51.156 any opensourceserver.io ; <<>> DiG 9.16.15 <<>> @207.177.51.156 any opensourceserver.io ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12321 ;; flags: qr aa rd; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 4 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1232 ;; QUESTION SECTION: ;opensourceserver.io. IN ANY ;; ANSWER SECTION: opensourceserver.io. 120 IN A 76.76.238.10 <other answers chopped> ;; Query time: 79 msec ;; SERVER: 207.177.51.156#53(207.177.51.156) ;; WHEN: Thu May 13 19:37:01 PDT 2021 ;; MSG SIZE rcvd: 366 Recheck your UDP forwarding and firewalls.
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