watchNS/postdns.net/2について、ここに記述してください。

どれが狭義のグルーレコードでしょうか。

• 本来不要なAレコードをつけてくるDNS(権威)サーバは多い。

$ dnsq ns postdns.net a.gtld-servers.net

2 postdns.net:
103 bytes, 1+0+3+1 records, response, noerror
query: 2 postdns.net
authority: postdns.net 172800 NS 01.dnsv.jp
authority: postdns.net 172800 NS 02.dnsv.jp
authority: postdns.net 172800 NS ns.postdns.net
additional: ns.postdns.net 172800 A 14.192.44.5

$ dnsq ns postdns.net ns.postdns.net

2 postdns.net:
130 bytes, 1+3+0+2 records, response, authoritative, noerror
query: 2 postdns.net
answer: postdns.net 600 NS ns.postdns.net
answer: postdns.net 600 NS ns1.dns.ne.jp
answer: postdns.net 600 NS f.ns.qmail.jp
additional: ns.postdns.net 600 A 14.192.44.5
additional: f.ns.qmail.jp 86400 A 14.192.44.5

$ dnsq ns postdns.net 01.dnsv.jp

2 postdns.net:
102 bytes, 1+2+0+2 records, response, authoritative, noerror
query: 2 postdns.net
answer: postdns.net 300 NS 02.dnsv.jp
answer: postdns.net 300 NS 01.dnsv.jp
additional: 01.dnsv.jp 3600 A 210.157.1.241
additional: 02.dnsv.jp 3600 A 210.172.133.145

$ dnsq ns postdns.net ns1.dns.ne.jp

2 postdns.net:
temporary failure

$ dnsq ns www.postdns.net ns1.dns.ne.jp

2 www.postdns.net:
78 bytes, 1+2+0+0 records, response, authoritative, noerror
query: 2 www.postdns.net
answer: www.postdns.net 3600 NS ns2.dns.ne.jp
answer: www.postdns.net 3600 NS ns1.dns.ne.jp