DNS/毒盛/CNAME/unboundについて、ここに記述してください。
Unbound は CNAME 返答についてくるAレコードは捨てるようだ。
dig -t a www.youtube.com @127.0.0.2
$ grep youtube-ui unbound.log [1443994329] unbound[1107:0] info: sanitize: removing extraneous answer RRset: youtube-ui.l.google.com. A IN [1443994329] unbound[1107:0] info: sending query: youtube-ui.l.google.com. A IN [1443994329] unbound[1107:0] info: iterator operate: chased to youtube-ui.l.google.com. A IN [1443994329] unbound[1107:0] info: sending query: youtube-ui.l.google.com. A IN [1443994330] unbound[1107:0] info: iterator operate: chased to youtube-ui.l.google.com. A IN [1443994330] unbound[1107:0] info: sending query: youtube-ui.l.google.com. A IN [1443994330] unbound[1107:0] info: iterator operate: chased to youtube-ui.l.google.com. A IN [1443994745] unbound[1107:0] info: sending query: youtube-ui.l.google.com. MX IN [1443994745] unbound[1107:0] info: iterator operate: chased to youtube-ui.l.google.com. MX IN
dns2.psn.jp. A を unbound に問い合せたら：
$ dig -t a dns2.psn.jp @127.0.0.2 ; <<>> DiG 9.9.5-3ubuntu0.4-Ubuntu <<>> -t a dns2.psn.jp @127.0.0.2 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42310 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 2 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;dns2.psn.jp. IN A ;; ANSWER SECTION: dns2.psn.jp. 7200 IN CNAME ns2.psn.jp. ns2.psn.jp. 7200 IN A 59.106.185.138 ;; AUTHORITY SECTION: psn.jp. 7200 IN NS ns.psn.jp. psn.jp. 7200 IN NS ns2.psn.jp. ;; ADDITIONAL SECTION: ns.psn.jp. 7200 IN A 49.212.13.62 ;; Query time: 216 msec ;; SERVER: 127.0.0.2#53(127.0.0.2) ;; WHEN: Wed Aug 05 16:54:58 JST 2015 ;; MSG SIZE rcvd: 121
[1438761297] unbound[2766:0] info: validator operate: query dns2.psn.jp. A IN [1438761297] unbound[2766:0] debug: iterator[module 1] operate: extstate:module_state_initial event:module_event_pass [1438761297] unbound[2766:0] info: resolving dns2.psn.jp. A IN [1438761297] unbound[2766:0] info: resolving (init part 2): dns2.psn.jp. A IN [1438761297] unbound[2766:0] info: resolving (init part 3): dns2.psn.jp. A IN [1438761297] unbound[2766:0] info: processQueryTargets: dns2.psn.jp. A IN [1438761297] unbound[2766:0] info: sending query: dns2.psn.jp. A IN [1438761297] unbound[2766:0] debug: sending to target: <jp.> 156.154.100.5#53 [1438761297] unbound[2766:0] debug: cache memory msg=55515 rrset=44850 infra=7101 val=33741 [1438761298] unbound[2766:0] debug: iterator[module 1] operate: extstate:module_wait_reply event:module_event_reply [1438761298] unbound[2766:0] info: iterator operate: query dns2.psn.jp. A IN [1438761298] unbound[2766:0] info: response for dns2.psn.jp. A IN [1438761298] unbound[2766:0] info: reply from <jp.> 156.154.100.5#53 [1438761298] unbound[2766:0] info: query response was REFERRAL [1438761298] unbound[2766:0] info: processQueryTargets: dns2.psn.jp. A IN [1438761298] unbound[2766:0] info: sending query: dns2.psn.jp. A IN [1438761298] unbound[2766:0] debug: sending to target: <psn.jp.> 59.106.185.138#53 [1438761298] unbound[2766:0] debug: iterator[module 1] operate: extstate:module_state_initial event:module_event_pass [1438761298] unbound[2766:0] info: iterator operate: query psn.jp. NS IN [1438761298] unbound[2766:0] info: resolving psn.jp. NS IN [1438761298] unbound[2766:0] info: resolving (init part 2): psn.jp. NS IN [1438761298] unbound[2766:0] info: resolving (init part 3): psn.jp. NS IN [1438761298] unbound[2766:0] info: processQueryTargets: psn.jp. NS IN [1438761298] unbound[2766:0] info: sending query: psn.jp. NS IN [1438761298] unbound[2766:0] debug: sending to target: <jp.> 210.138.175.244#53 [1438761298] unbound[2766:0] debug: cache memory msg=55515 rrset=44850 infra=7337 val=33741 [1438761298] unbound[2766:0] debug: iterator[module 1] operate: extstate:module_wait_reply event:module_event_reply [1438761298] unbound[2766:0] info: iterator operate: query dns2.psn.jp. A IN [1438761298] unbound[2766:0] info: sanitize: removing extraneous answer RRset: ns2.psn.jp. A IN [1438761298] unbound[2766:0] info: response for dns2.psn.jp. A IN [1438761298] unbound[2766:0] info: reply from <psn.jp.> 59.106.185.138#53 [1438761298] unbound[2766:0] info: query response was CNAME [1438761298] unbound[2766:0] info: resolving dns2.psn.jp. A IN [1438761298] unbound[2766:0] info: resolving (init part 2): dns2.psn.jp. A IN [1438761298] unbound[2766:0] info: resolving (init part 3): dns2.psn.jp. A IN [1438761298] unbound[2766:0] info: processQueryTargets: dns2.psn.jp. A IN [1438761298] unbound[2766:0] info: sending query: ns2.psn.jp. A IN [1438761298] unbound[2766:0] debug: sending to target: <psn.jp.> 49.212.13.62#53 [1438761298] unbound[2766:0] debug: cache memory msg=55515 rrset=45313 infra=7573 val=33741 [1438761298] unbound[2766:0] debug: iterator[module 1] operate: extstate:module_wait_reply event:module_event_reply [1438761298] unbound[2766:0] info: iterator operate: query psn.jp. NS IN [1438761298] unbound[2766:0] info: response for psn.jp. NS IN [1438761298] unbound[2766:0] info: reply from <jp.> 210.138.175.244#53 [1438761298] unbound[2766:0] info: query response was REFERRAL [1438761298] unbound[2766:0] info: processQueryTargets: psn.jp. NS IN [1438761298] unbound[2766:0] info: sending query: psn.jp. NS IN [1438761298] unbound[2766:0] debug: sending to target: <psn.jp.> 49.212.13.62#53 [1438761298] unbound[2766:0] debug: iterator[module 1] operate: extstate:module_state_initial event:module_event_pass [1438761298] unbound[2766:0] info: iterator operate: query ns.psn.jp. A IN [1438761298] unbound[2766:0] info: resolving ns.psn.jp. A IN [1438761298] unbound[2766:0] info: resolving (init part 2): ns.psn.jp. A IN [1438761298] unbound[2766:0] info: resolving (init part 3): ns.psn.jp. A IN [1438761298] unbound[2766:0] info: processQueryTargets: ns.psn.jp. A IN [1438761298] unbound[2766:0] info: sending query: ns.psn.jp. A IN [1438761298] unbound[2766:0] debug: sending to target: <psn.jp.> 49.212.13.62#53 [1438761298] unbound[2766:0] debug: iterator[module 1] operate: extstate:module_state_initial event:module_event_pass [1438761298] unbound[2766:0] info: iterator operate: query ns2.psn.jp. A IN [1438761298] unbound[2766:0] info: resolving ns2.psn.jp. A IN [1438761298] unbound[2766:0] info: resolving (init part 2): ns2.psn.jp. A IN [1438761298] unbound[2766:0] info: resolving (init part 3): ns2.psn.jp. A IN [1438761298] unbound[2766:0] info: processQueryTargets: ns2.psn.jp. A IN [1438761298] unbound[2766:0] info: sending query: ns2.psn.jp. A IN [1438761298] unbound[2766:0] debug: sending to target: <psn.jp.> 49.212.13.62#53 [1438761298] unbound[2766:0] debug: cache memory msg=55515 rrset=45821 infra=7573 val=33834 [1438761298] unbound[2766:0] debug: iterator[module 1] operate: extstate:module_wait_reply event:module_event_reply [1438761298] unbound[2766:0] info: iterator operate: query ns2.psn.jp. A IN [1438761298] unbound[2766:0] info: response for ns2.psn.jp. A IN [1438761298] unbound[2766:0] info: reply from <psn.jp.> 49.212.13.62#53 [1438761298] unbound[2766:0] info: query response was ANSWER [1438761298] unbound[2766:0] info: finishing processing for ns2.psn.jp. A IN [1438761298] unbound[2766:0] debug: validator[module 0] operate: extstate:module_state_initial event:module_event_moddone [1438761298] unbound[2766:0] info: validator operate: query ns2.psn.jp. A IN [1438761298] unbound[2766:0] debug: cache memory msg=55683 rrset=45821 infra=7573 val=33834 [1438761298] unbound[2766:0] debug: iterator[module 1] operate: extstate:module_wait_reply event:module_event_reply [1438761298] unbound[2766:0] info: iterator operate: query dns2.psn.jp. A IN [1438761298] unbound[2766:0] info: iterator operate: chased to ns2.psn.jp. A IN [1438761298] unbound[2766:0] info: response for dns2.psn.jp. A IN [1438761298] unbound[2766:0] info: reply from <psn.jp.> 49.212.13.62#53 [1438761298] unbound[2766:0] info: query response was ANSWER [1438761298] unbound[2766:0] info: finishing processing for dns2.psn.jp. A IN [1438761298] unbound[2766:0] debug: validator[module 0] operate: extstate:module_wait_module event:module_event_moddone [1438761298] unbound[2766:0] info: validator operate: query dns2.psn.jp. A IN [1438761298] unbound[2766:0] debug: cache memory msg=55868 rrset=45821 infra=7573 val=33834 [1438761298] unbound[2766:0] debug: iterator[module 1] operate: extstate:module_wait_reply event:module_event_reply [1438761298] unbound[2766:0] info: iterator operate: query psn.jp. NS IN [1438761298] unbound[2766:0] info: response for psn.jp. NS IN [1438761298] unbound[2766:0] info: reply from <psn.jp.> 49.212.13.62#53 [1438761298] unbound[2766:0] info: query response was ANSWER [1438761298] unbound[2766:0] info: finishing processing for psn.jp. NS IN [1438761298] unbound[2766:0] debug: validator[module 0] operate: extstate:module_state_initial event:module_event_moddone [1438761298] unbound[2766:0] info: validator operate: query psn.jp. NS IN [1438761298] unbound[2766:0] debug: cache memory msg=56032 rrset=45821 infra=7573 val=33834 [1438761298] unbound[2766:0] debug: iterator[module 1] operate: extstate:module_wait_reply event:module_event_reply [1438761298] unbound[2766:0] info: iterator operate: query ns.psn.jp. A IN [1438761298] unbound[2766:0] info: response for ns.psn.jp. A IN [1438761298] unbound[2766:0] info: reply from <psn.jp.> 49.212.13.62#53 [1438761298] unbound[2766:0] info: query response was ANSWER [1438761298] unbound[2766:0] info: finishing processing for ns.psn.jp. A IN [1438761298] unbound[2766:0] debug: validator[module 0] operate: extstate:module_state_initial event:module_event_moddone [1438761298] unbound[2766:0] info: validator operate: query ns.psn.jp. A IN [1438761298] unbound[2766:0] debug: cache memory msg=56199 rrset=45821 infra=7573 val=33834