DNS/実装/unbound/harden-referral-path/動作確認について、ここに記述してください。
1. off
$ unbound-control set_option harden-referral-path no ok tmaeno@u16:~$ unbound-control get_option harden-referral-path no tmaeno@u16:~$ unbound-control flush_zone brau.jp ok removed 3 rrsets, 4 messages and 0 key entries tmaeno@u16:~$ dig poison.brau.jp @127.0.0.3 ; <<>> DiG 9.12.3 <<>> poison.brau.jp @127.0.0.3 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 58283 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1220 ;; QUESTION SECTION: ;poison.brau.jp. IN A ;; AUTHORITY SECTION: brau.jp. 2560 IN SOA a.ns.brau.jp. hostmaster.brau.jp. 1543968754 16384 2048 1048576 2560 ;; Query time: 23 msec ;; SERVER: 127.0.0.3#53(127.0.0.3) ;; WHEN: 水 12月 05 13:51:46 JST 2018 ;; MSG SIZE rcvd: 95
[1543985484] unbound[7346:0] info: control cmd: set_option harden-referral-path no [1543985488] unbound[7346:0] info: control cmd: get_option harden-referral-path [1543985498] unbound[7346:0] info: control cmd: flush_zone brau.jp [1543985506] unbound[7346:0] info: resolving poison.brau.jp. A IN [1543985506] unbound[7346:0] info: response for poison.brau.jp. A IN [1543985506] unbound[7346:0] info: reply from <jp.> 192.50.43.53#53 [1543985506] unbound[7346:0] info: query response was REFERRAL [1543985506] unbound[7346:0] info: response for poison.brau.jp. A IN [1543985506] unbound[7346:0] info: reply from <brau.jp.> 14.192.44.29#53 [1543985506] unbound[7346:0] info: query response was NXDOMAIN ANSWER