não acoplado / nsd retornando SERVFAIL, resolvendo o DNS da LAN local. nsd sozinho funciona bem

Eu tenho usado desacoplado como um servidor DNS recursivo local. Acabei de adicionar o nsd para configurar o DNS da LAN local. O nsd está escutando na porta 53530 e funciona bem:

$ dig @127.0.0.1 data2.datanet.home -p 53530

; <<>> DiG 9.9.2-P2 <<>> @127.0.0.1 data2.datanet.home -p 53530
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59577
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;data2.datanet.home.            IN      A

;; ANSWER SECTION:
data2.datanet.home.     600     IN      A       192.168.1.62

;; AUTHORITY SECTION:
datanet.home.           600     IN      NS      ns1.datanet.home.

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53530(127.0.0.1)
;; WHEN: Mon Jun 15 07:16:24 2015
;; MSG SIZE  rcvd: 81

Ao passar pelo local não ligado, ele não funciona:

$ dig @127.0.0.1 data2.datanet.home

; <<>> DiG 9.9.2-P2 <<>> @127.0.0.1 data2.datanet.home
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 47645
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;data2.datanet.home.            IN      A

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon Jun 15 07:18:02 2015
;; MSG SIZE  rcvd: 47

Aqui está o que eu estou obtendo no log não vinculado com verbosidade: 4

Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] info: validator operate: query router.datanet.home. A IN
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: validator: pass to next module
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: mesh_run: validator module exit state is module_wait_module
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: iterator[module 1] operate: extstate:module_state_initial event:
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: process_request: new external request event
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: iter_handle processing q with state INIT REQUEST STATE
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] info: resolving router.datanet.home. A IN
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: request has dependency depth of 0
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] info: use stub datanet.home. NS IN
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: cache delegation returns delegpt
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] info: DelegationPoint<datanet.home.>: 0 names (0 missing), 1 addrs (0 r
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug:    ip4 127.0.0.1 port 53530 (len 16)
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: iter_handle processing q with state INIT REQUEST STATE (stage 2)
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] info: resolving (init part 2):  router.datanet.home. A IN
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] info: use stub datanet.home. NS IN
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: iter_handle processing q with state INIT REQUEST STATE (stage 3)
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] info: resolving (init part 3):  router.datanet.home. A IN
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: iter_handle processing q with state QUERY TARGETS STATE
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] info: processQueryTargets: router.datanet.home. A IN
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: processQueryTargets: targetqueries 0, currentqueries 0 sentcount
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] info: DelegationPoint<datanet.home.>: 0 names (0 missing), 1 addrs (0 r
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug:    ip4 127.0.0.1 port 53530 (len 16)
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: attempt to get extra 3 targets
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: skip addr on the donotquery list ip4 127.0.0.1 port 53530 (len 1
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: No more query targets, attempting last resort
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: configured stub servers failed -- returning SERVFAIL
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: store error response in message cache
Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: return error response SERVFAIL

Em particular, o que há com isso? [1947: 0] debug: skip addr na lista donotquery ip4 127.0.0.1 porta 53530 (len 1 Isso parece ser a chave, mas eu realmente não sei ao certo por que está dizendo isso.

Aqui está todo o unbound.conf:

server:
  interface: 127.0.0.1
  interface: 192.168.1.50
  use-syslog: yes
  username: "unbound"
  directory: "/etc/unbound"
  trust-anchor-file: trusted-key.key
  access-control: 192.168.1.0/24 allow
  verbosity: 2
  local-zone: "1.168.192.in-addr.arpa" nodefault
remote-control:
  control-enable: yes
  control-interface: 127.0.0.1
  control-port: 8953
  server-key-file: "/etc/unbound/unbound_server.key"
  server-cert-file: "/etc/unbound/unbound_server.pem"
  control-key-file: "/etc/unbound/unbound_control.key"
  control-cert-file: "/etc/unbound/unbound_control.pem"

stub-zone:
  name: "datanet.home"
  stub-addr: 127.0.0.1@53530
#  stub-first: yes
stub-zone:
  name: "1.168.192.in-addr.arpa"
  stub-addr: 127.0.0.1@53530

O nsd.conf tem muitos comentários, por isso não tenho certeza se devo colá-lo, mas, em qualquer caso, o nsd parece funcionar bem. É praticamente o mesmo que o exemplo incluído conf, exceto alterar a porta, ativar o controle e adicionar as zonas.

Estou perplexo com isso, para que todas as idéias sejam apreciadas!

Esta linha do log indica o problema:

Jun 15 06:12:39 pizza.yoderdev.com unbound[1947]: [1947:0] debug: skip addr on the donotquery list ip4 127.0.0.1 port 53530 (len 1

Não vinculado por padrão se recusa a enviar qualquer consulta DNS para o host local. Para permitir que ele localhost local, defina-o do-not-query-localhostcomo nona serverseção-da configuração Unbound:

server:
  interface: 127.0.0.1
  interface: 192.168.1.50
  [...]
  do-not-query-localhost: no

Veja a documentação do unbound.conf para uma descrição da opção.

Para perguntas sobre Unbound e NSD, você pode usar as listas de discussão executadas pelo NLnet Labs ( https://www.nlnetlabs.nl/support/mailing-lists/ ). Nessas listas de discussão, há uma grande comunidade que responde muito bem (incluindo os desenvolvedores de software da Unbound e NSD).