我們要連往行政院農業委員會 農業藥物毒物試驗所的網頁時出了一些問題
該網址為
http://www.phicroc.gov.tw , IP為 210.241.63.225
我從我們的DNS Service主機上檢查連外的狀況如下:
$ sudo nmap -sU -P0 -p 53 168.95.1.1
Starting nmap V. 3.00 (
www.insecure.org/nmap/ )
Interesting ports on dns.hinet.net (168.95.1.1):
Port State Service
53/udp open domain
Nmap run completed -- 1 IP address (1 host up) scanned in 72 seconds
$ sudo nmap -sU -P0 -p 53 210.241.63.225
Starting nmap V. 3.00 (
www.insecure.org/nmap/ )
Interesting ports on (210.241.63.225):
Port State Service
53/udp open domain
Nmap run completed -- 1 IP address (1 host up) scanned in 67 seconds
檢查兩台外部兩台DNS皆可以連線
但是查詢目標主機時會出現下面的問題
$ dig
www.phicroc.gov.tw; <<>> DiG 9.2.4rc6 <<>>
www.phicroc.gov.tw;; global options: printcmd
;; connection timed out; no servers could be reached
$ dig +trace
www.phicroc.gov.tw; <<>> DiG 9.2.4rc6 <<>> +trace
www.phicroc.gov.tw;; global options: printcmd
. 480562 IN NS i.root-servers.net.
. 480562 IN NS j.root-servers.net.
. 480562 IN NS k.root-servers.net.
. 480562 IN NS l.root-servers.net.
. 480562 IN NS m.root-servers.net.
. 480562 IN NS a.root-servers.net.
. 480562 IN NS b.root-servers.net.
. 480562 IN NS c.root-servers.net.
. 480562 IN NS d.root-servers.net.
. 480562 IN NS e.root-servers.net.
. 480562 IN NS f.root-servers.net.
. 480562 IN NS g.root-servers.net.
. 480562 IN NS h.root-servers.net.
;; Received 492 bytes from 61.56.15.166#53(61.56.15.166) in 1 ms
tw. 172800 IN NS H.DNS.tw.
tw. 172800 IN NS NS.TWNIC.NET.
tw. 172800 IN NS A.DNS.tw.
tw. 172800 IN NS B.DNS.tw.
tw. 172800 IN NS C.DNS.tw.
tw. 172800 IN NS D.DNS.tw.
tw. 172800 IN NS E.DNS.tw.
tw. 172800 IN NS F.DNS.tw.
tw. 172800 IN NS G.DNS.tw.
;; Received 422 bytes from 192.36.148.17#53(i.root-servers.net) in 34 ms
gov.tw. 86400 IN NS a.twnic.net.tw.
gov.tw. 86400 IN NS b.twnic.net.tw.
gov.tw. 86400 IN NS c.twnic.net.tw.
;; Received 170 bytes from 61.31.216.3#53(H.DNS.tw) in 8 ms
phicroc.gov.tw. 43200 IN NS
www.phicroc.gov.tw.
;; Received 66 bytes from 192.83.166.9#53(a.twnic.net.tw) in 2 ms
dig: Couldn't find server 'www.phicroc.gov.tw': Name or service not known
如果是用外部的DNS則可以查詢到
$dig @168.95.1.1
www.phicroc.gov.tw; <<>> DiG 9.2.4rc6 <<>> @168.95.1.1
www.phicroc.gov.tw;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 43019
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1
;; QUESTION SECTION:
;www.phicroc.gov.tw. IN A
;; ANSWER SECTION:
www.phicroc.gov.tw. 43200 IN A 210.241.63.225
;; AUTHORITY SECTION:
phicroc.gov.tw. 43200 IN NS
www.phicroc.gov.tw.
;; ADDITIONAL SECTION:
www.phicroc.gov.tw. 43200 IN A 210.241.63.225
;; Query time: 3 msec
;; SERVER: 168.95.1.1#53(168.95.1.1)
;; WHEN: Thu May 22 14:55:36 2008
;; MSG SIZE rcvd: 96
$ dig @a.twnic.net.tw
www.phicroc.gov.tw; <<>> DiG 9.2.4rc6 <<>> @a.twnic.net.tw
www.phicroc.gov.tw;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56983
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; QUESTION SECTION:
;www.phicroc.gov.tw. IN A
;; AUTHORITY SECTION:
phicroc.gov.tw. 43200 IN NS
www.phicroc.gov.tw.
;; ADDITIONAL SECTION:
www.phicroc.gov.tw. 43200 IN A 210.241.63.225
;; Query time: 2 msec
;; SERVER: 192.83.166.9#53(a.twnic.net.tw)
;; WHEN: Thu May 22 14:55:43 2008
;; MSG SIZE rcvd: 66
請教此問題該如何解決?