unbound/nsd 返回解析本地 LAN DNS 的 SERVFAIL。单独 nsd 工作正常

Question

我一直在使用 unbound 作为本地递归 DNS 服务器。刚刚添加了 nsd 来设置本地 LAN DNS。nsd 正在侦听端口 53530 并且工作正常：

$ 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

通过本地未绑定时它不起作用：

$ 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

这是我在未绑定日志中得到的详细信息：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

特别是这是怎么回事？[1947:0] debug: skip addr on the donotquery list ip4 127.0.0.1 port 53530 (len 1 这似乎是关键，但我真的不知道为什么这么说。

这是我的整个 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

nsd.conf 有很多注释，所以不确定我是否应该粘贴它，但无论如何 nsd 似乎工作正常。除了更改端口、启用控制内容和添加区域之外，它与包含的示例 conf 几乎相同。

我被这个难住了，所以任何想法将不胜感激！

Answer 1

日志中的这一行表明了问题：

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

默认情况下未绑定拒绝向本地主机发送任何 DNS 查询。使其能够查询本地主机，设置do-not-query-localhost要no在server未绑定配置的-section：

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

有关该选项的说明，请参阅unbound.conf的文档。