TLD/com/KnotResloverについて、ここに記述してください。

$ dig av4.nstld.com @127.0.0.3

[hint] reading '/etc/hosts'
[hint] loaded 20 hints
[hint] loaded 20 hints
[hint] loaded 20 hints
[plan] plan 'av4.nstld.com.' type 'A'
[resl]   => using root hints
[resl]   => querying: '202.12.27.33' score: 10 zone cut: '.' m12n: 'cOm.' type: 'NS'
[resl]      optional: '199.7.83.42' score: 10 zone cut: '.' m12n: 'cOm.' type: 'NS'
[resl]      optional: '193.0.14.129' score: 10 zone cut: '.' m12n: 'cOm.' type: 'NS'
[resl]      optional: '192.58.128.30' score: 10 zone cut: '.' m12n: 'cOm.' type: 'NS'
[iter]   <= referral response, follow
[resl]   <= server: '202.12.27.33' rtt: 6 ms

root-servers から com NS を得る。(gtld-servers.netが返る）

そのままadditionalを信用して、問い合わせている。（m.gtld-servers.netなどに）

[resl]   => querying: '192.55.83.30' score: 10 zone cut: 'com.' m12n: 'nstld.cOM.' type: 'NS'
[resl]      optional: '192.41.162.30' score: 10 zone cut: 'com.' m12n: 'nstld.cOM.' type: 'NS'
[resl]      optional: '192.52.178.30' score: 10 zone cut: 'com.' m12n: 'nstld.cOM.' type: 'NS'
[resl]      optional: '192.48.79.30' score: 10 zone cut: 'com.' m12n: 'nstld.cOM.' type: 'NS'
[iter]   <= referral response, follow
[resl]   <= server: '192.55.83.30' rtt: 73 ms

それで得られたNS+Additionalを信用して、問い合わせて終わり。怖い。

[resl]   => querying: '192.82.134.30' score: 10 zone cut: 'nstld.com.' m12n: 'av4.nStld.cOM.' type: 'A'
[resl]      optional: '192.82.133.30' score: 10 zone cut: 'nstld.com.' m12n: 'av4.nStld.cOM.' type: 'A'
[resl]      optional: '192.42.178.30' score: 10 zone cut: 'nstld.com.' m12n: 'av4.nStld.cOM.' type: 'A'
[resl]      optional: '192.42.177.30' score: 10 zone cut: 'nstld.com.' m12n: 'av4.nStld.cOM.' type: 'A'
[iter]   <= rcode: NOERROR
[resl]   <= server: '192.82.134.30' rtt: 8 ms
[resl] finished: 4, queries: 1, mempool: 32800 B