問題1:
我用nslookup查www.yahoo.com,我內部DNS查到的是:
Non-authoritative answer:
Name:
www.yahoo.akadns.netAddresses: 68.142.197.76, 68.142.197.83, 68.142.197.84, 68.142.197.87
68.142.197.90, 68.142.197.64, 68.142.197.66, 68.142.197.69
Aliases:
www.yahoo.com查Hinet 168.95.1.1的DNS是:
Non-authoritative answer:
Name:
www.yahoo.akadns.netAddresses: 66.94.230.33, 66.94.230.41, 66.94.230.32, 66.94.230.47
66.94.230.48, 66.94.230.35, 66.94.230.36, 66.94.230.45
Aliases:
www.yahoo.com我用netstat查本機連至www.yahoo.com的IP是:
66.102.1.104
請問為何會如此呢?應該會連不上才是,怎還是可以連呢,為何呢?太令人疑惑了!還請各位大大幫忙,感謝!
問題2:
為何我指向yahoo.com的DNS Server郤無法查到www.yahoo.com的record,
難道他們只下放給ISP的DNS Server作查詢嗎?不解,還請各位大大能否解惑,感謝!
[root@dns2 ]# dig @168.95.1.1 yahoo.com ns
; <<>> DiG 9.2.1 <<>> @168.95.1.1 yahoo.com ns
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13218
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 5
;; QUESTION SECTION:
;yahoo.com. IN NS
;; ANSWER SECTION:
yahoo.com. 14611 IN NS ns5.yahoo.com.
yahoo.com. 14611 IN NS ns1.yahoo.com.
yahoo.com. 14611 IN NS ns2.yahoo.com.
yahoo.com. 14611 IN NS ns3.yahoo.com.
yahoo.com. 14611 IN NS ns4.yahoo.com.
;; ADDITIONAL SECTION:
ns5.yahoo.com. 106123 IN A 216.109.116.17
ns1.yahoo.com. 108450 IN A 66.218.71.63
ns2.yahoo.com. 121062 IN A 66.163.169.170
ns3.yahoo.com. 107584 IN A 217.12.4.104
ns4.yahoo.com. 106373 IN A 63.250.206.138
;; Query time: 353 msec
;; SERVER: 168.95.1.1#53(168.95.1.1)
;; WHEN: Thu Jan 5 15:59:22 2006
;; MSG SIZE rcvd: 197
[root@dns2 ]# dig @ns5.yahoo.com
www.yahoo.com; <<>> DiG 9.2.1 <<>> @ns5.yahoo.com
www.yahoo.com;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10875
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 13, ADDITIONAL: 0
;; QUESTION SECTION:
;www.yahoo.com. IN A
;; ANSWER SECTION:
www.yahoo.com. 300 IN CNAME
www.yahoo.akadns.net.
;; AUTHORITY SECTION:
. 3600000 IN NS A.ROOT-SERVERS.net.
. 3600000 IN NS B.ROOT-SERVERS.net.
. 3600000 IN NS C.ROOT-SERVERS.net.
. 3600000 IN NS D.ROOT-SERVERS.net.
. 3600000 IN NS E.ROOT-SERVERS.net.
. 3600000 IN NS F.ROOT-SERVERS.net.
. 3600000 IN NS G.ROOT-SERVERS.net.
. 3600000 IN NS H.ROOT-SERVERS.net.
. 3600000 IN NS I.ROOT-SERVERS.net.
. 3600000 IN NS J.ROOT-SERVERS.net.
. 3600000 IN NS K.ROOT-SERVERS.net.
. 3600000 IN NS L.ROOT-SERVERS.net.
. 3600000 IN NS M.ROOT-SERVERS.net.
;; Query time: 220 msec
;; SERVER: 216.109.116.17#53(ns5.yahoo.com)
;; WHEN: Thu Jan 5 16:00:44 2006
;; MSG SIZE rcvd: 273
[root@dns2 ]#