也許該特定主機的DNS服務器已關閉;請檢查域的whois
記錄以發現哪些DNS服務器具有權威性,然後依次使用host
檢查它們中的每一個,以確定它們全部解決。
例如,whois stackoverflow.com
:
Name Servers:
ns1.serverfault.com
ns2.serverfault.com
ns3.serverfault.com
然後:
$ host www.stackoverflow.com ns1.serverfault.com
Using domain server:
Name: ns1.serverfault.com
Address: 64.34.119.33#53
Aliases:
www.stackoverflow.com is an alias for stackoverflow.com.
stackoverflow.com has address 64.34.119.12
stackoverflow.com mail is handled by 10 STACKOVERFLOW.COM.S9A1.PSMTP.com.
stackoverflow.com mail is handled by 20 STACKOVERFLOW.COM.S9A2.PSMTP.com.
stackoverflow.com mail is handled by 30 STACKOVERFLOW.COM.S9B1.PSMTP.com.
stackoverflow.com mail is handled by 40 STACKOVERFLOW.COM.S9B2.PSMTP.com.
$ host www.stackoverflow.com ns2.serverfault.com
Using domain server:
Name: ns2.serverfault.com
Address: 64.34.119.34#53
Aliases:
www.stackoverflow.com is an alias for stackoverflow.com.
stackoverflow.com has address 64.34.119.12
stackoverflow.com mail is handled by 30 STACKOVERFLOW.COM.S9B1.PSMTP.com.
stackoverflow.com mail is handled by 40 STACKOVERFLOW.COM.S9B2.PSMTP.com.
stackoverflow.com mail is handled by 10 STACKOVERFLOW.COM.S9A1.PSMTP.com.
stackoverflow.com mail is handled by 20 STACKOVERFLOW.COM.S9A2.PSMTP.com.
$ host www.stackoverflow.com ns3.serverfault.com
Using domain server:
Name: ns3.serverfault.com
Address: 69.59.196.217#53
Aliases:
www.stackoverflow.com is an alias for stackoverflow.com.
stackoverflow.com has address 64.34.119.12
stackoverflow.com mail is handled by 30 STACKOVERFLOW.COM.S9B1.PSMTP.com.
stackoverflow.com mail is handled by 40 STACKOVERFLOW.COM.S9B2.PSMTP.com.
stackoverflow.com mail is handled by 10 STACKOVERFLOW.COM.S9A1.PSMTP.com.
stackoverflow.com mail is handled by 20 STACKOVERFLOW.COM.S9A2.PSMTP.com.
$
三臺服務器響應請求www.stackoverflow.com
,所以這三個服務器的功能。
你可以ping每臺服務器嗎? –