I have seen this problem posted in various places over the years. It is not clear if it is a bug, a bad config, or just non-functional.
My set up: VM running Centos 7, up to date. pdns install using postgresql db. pdns-recursor install. pdns is running as an authoritive ns, standalone, replicated via postgresql to a second VM, pretty much identical. pdns is set with recursor=local-address:5300 pdns-recursor is set with local-address equal to pdns local-address above pdns-recursor is set with local-port equal to pdns 5300 above. It all seems to work. The authoritive nameserver is private, and is populated with a few records which work. The recursor is being tested with DiG. (and with typical surfing). I have verified that the VM has no other dns function working in parallel. All DiG commands so far work with the exception of +trace. I have logs running, and can easily see logs generated for DiG commands that work. I have attached a console example. The logs and console indicate that the DiG command with +trace doesn't fail; it just doesn't even respond. If I target the same DiG +trace command at my router's dnsmasq, it responds as expected with a whole bunch of trace info. I have tried for days/hours with all variations I can think of and all manner of surfing for solutions. If there were failure logs it would help, but absolutely zero logs with the +trace command is issued to pdns. I have also dumped my cache and it has many NS records. I am tempted to simply ignore this and just use the thing as it seems to work. I only tried DiG +trace to see how it all works......
[stanloc@x029s1 ~]$ dig www.google.com ; <<>> DiG 9.9.4-RedHat-9.9.4-38.el7_3.1 <<>> www.google.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38058 ;; flags: qr rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.google.com. IN A ;; ANSWER SECTION: www.google.com. 300 IN A 24.244.4.58 www.google.com. 300 IN A 24.244.4.57 www.google.com. 300 IN A 24.244.4.55 www.google.com. 300 IN A 24.244.4.59 www.google.com. 300 IN A 24.244.4.56 www.google.com. 300 IN A 24.244.4.52 www.google.com. 300 IN A 24.244.4.54 www.google.com. 300 IN A 24.244.4.53 ;; Query time: 152 msec ;; SERVER: 192.168.1.148#53(192.168.1.148) ;; WHEN: Thu Feb 16 17:18:11 MST 2017 ;; MSG SIZE rcvd: 160 [stanloc@x029s1 ~]$ dig +trace www.google.com ; <<>> DiG 9.9.4-RedHat-9.9.4-38.el7_3.1 <<>> +trace www.google.com ;; global options: +cmd ;; Received 28 bytes from 192.168.1.148#53(192.168.1.148) in 25 ms
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