動作テストには、高機能なdigを利用する。
1. LAN内の正引き
[root@linux /root]# dig www.kkoba.com a <--- www.kkoba.comのAddressを調べる
; <<>> DiG 8.3 <<>> www.kkoba.com a
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 1
;; QUERY SECTION:
;; www.kkoba.com, type = A, class = IN
;; ANSWER SECTION:
www.kkoba.com. 1D IN CNAME linux.kkoba.com. <--- www.kkoba.comはlinux.kkoba.comの別名
linux.kkoba.com. 1D IN A 172.25.0.2 <--- linux.kkoba.comは172.25.0.2
;; AUTHORITY SECTION:
kkoba.com. 1D IN NS linux.kkoba.com. <--- kkoba.comのName Serverはlinux.kkoba.com
;; ADDITIONAL SECTION:
linux.kkoba.com. 1D IN A 172.25.0.2 <--- Name Serverのlinux.kkoba.comは172.25.0.2
;; Total query time: 0 msec
;; FROM: linux to SERVER: default -- 172.25.0.2
;; WHEN: Sat Nov 3 04:24:00 2001
;; MSG SIZE sent: 31 rcvd: 97
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2. LAN内の逆引き
[root@linux /root]# dig -x 172.25.0.2 <--- 172.25.0.2の逆引きを調べる
; <<>> DiG 8.3 <<>> -x 172.25.0.2
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1
;; QUERY SECTION:
;; 2.0.25.172.in-addr.arpa, type = PTR, class = IN
;; ANSWER SECTION:
2.0.25.172.in-addr.arpa. 1D IN PTR linux.kkoba.com. <--- 172.25.0.2はlinux.kkoba.com
;; AUTHORITY SECTION:
0.25.172.in-addr.arpa. 1D IN NS linux.kkoba.com. <--- kkoba.comのName Serverはlinux.kkoba.com
;; ADDITIONAL SECTION:
linux.kkoba.com. 1D IN A 172.25.0.2 <--- Name Serverのlinux.kkoba.comは172.25.0.2
;; Total query time: 0 msec
;; FROM: linux to SERVER: default -- 172.25.0.2
;; WHEN: Sat Nov 3 04:28:07 2001
;; MSG SIZE sent: 41 rcvd: 100
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3. LAN外の正引き
[root@linux /root]# dig www.amazon.com <--- www.amazon.comの正引きを調べる
; <<>> DiG 8.3 <<>> www.amazon.com
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 4
;; QUERY SECTION:
;; www.amazon.com, type = A, class = IN
;; ANSWER SECTION:
www.amazon.com. 47S IN A 207.171.183.16
;; AUTHORITY SECTION:
www.amazon.com. 23h57m56s IN NS ns-20.amazon.com.
www.amazon.com. 23h57m56s IN NS ns-10.amazon.com.
www.amazon.com. 23h57m56s IN NS ns-30.amazon.com.
www.amazon.com. 23h57m56s IN NS ns-40.amazon.com.
;; ADDITIONAL SECTION:
ns-20.amazon.com. 23h57m56s IN A 208.33.216.20
ns-10.amazon.com. 23h57m56s IN A 208.192.211.10
ns-30.amazon.com. 23h57m56s IN A 207.171.167.7
ns-40.amazon.com. 23h57m56s IN A 207.171.169.7
;; Total query time: 1 msec
;; FROM: linux to SERVER: default -- 172.25.0.2
;; WHEN: Sat Nov 3 04:45:58 2001
;; MSG SIZE sent: 32 rcvd: 192
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4. LAN外の逆引き
[root@linux /root]# dig -x 207.171.183.16 <--- 207.171.183.16の正引きを調べる
; <<>> DiG 8.3 <<>> -x 207.171.183.16
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2
;; QUERY SECTION:
;; 16.183.171.207.in-addr.arpa, type = PTR, class = IN
;; ANSWER SECTION:
16.183.171.207.in-addr.arpa. 1h59m56s IN PTR www.amazon.com.
;; AUTHORITY SECTION:
183.171.207.in-addr.arpa. 23h59m56s IN NS NS1.PNAP.NET.
183.171.207.in-addr.arpa. 23h59m56s IN NS NS-1.amazon.com.
;; ADDITIONAL SECTION:
NS1.PNAP.NET. 1d23h54m6s IN A 206.253.194.65
NS-1.amazon.com. 1d23h54m6s IN A 209.191.164.20
;; Total query time: 0 msec
;; FROM: linux to SERVER: default -- 172.25.0.2
;; WHEN: Sat Nov 3 04:49:48 2001
;; MSG SIZE sent: 45 rcvd: 150
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