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. …