nslookup工作，但ping失败，随机DNS错误

我正在使用Mac OS X 10.6.8。 当我试图ping一个特定的域时，它返回“未知的主机”，但是当我立即在同一台主机上运行nslookup时，它会返回正确的IP。

Ping继续抛出DNS错误近一分钟，然后自动恢复。

我看着我的系统的/var/log/system.log，发现在失败时logging下面的条目。 我使用以下命令来获取debugging日志。

"killall -USR1 mDNSResponder" "killall -USR2 mDNSResponder" "killall -INFO mDNSResponder" 

日志条目在失败期间：

• spf和dkimlogging在同一个dns区域文件中
• Debian的parsing器添加域名，我不想这样做
• 创buildPTRlogging，但未find
• 具有.no域名的虚荣名称服务器
• Postfix以奇怪的方式发送和接收。

 Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: Adding FD for uid 501\ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: DNSServiceCreateConnection START\ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: Error socket 30 created 00000000 00000001\ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: DNSServiceQueryRecord(5000, 0, api-beta.mydomain.com., Addr) START\ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: Error socket 30 closed 00000000 00000001 (0)\ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: DNSServiceQueryRecord(api-beta.mydomain.com., Addr) ADD 0 api-beta.mydomain.com. Addr \ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: Cancel 00000000 00000001\ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: DNSServiceQueryRecord(api-beta.mydomain.com., Addr) STOP\ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: Error socket 30 created 00000000 00000002\ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: DNSServiceQueryRecord(5000, 0, api-beta.mydomain.com., Addr) START\ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: Error socket 30 closed 00000000 00000002 (0)\ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: DNSServiceQueryRecord(api-beta.mydomain.com., Addr) ADD 0 api-beta.mydomain.com. Addr \ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: Cancel 00000000 00000002\ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: DNSServiceQueryRecord(api-beta.mydomain.com., Addr) STOP\ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: DNSServiceCreateConnection STOP\ Feb 24 12:50:25 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: Removing FD\ Feb 24 12:50:42 Administrators-MacBook-Pro-15 sudo[3675]: administrator : TTY=ttys004 ; PWD=/Users/administrator ; USER=root ; COMMAND=/usr/bin/killall -INFO mDNSResponder\ Feb 24 12:50:42 Administrators-MacBook-Pro-15 mDNSResponder[30]: ---- BEGIN STATE LOG ---- mDNSResponder mDNSResponder-258.21 (May 26 2011 14:40:13)\ Feb 24 12:50:42 Administrators-MacBook-Pro-15 mDNSResponder[30]: Timenow 0x91434D92 (-1857860206)\ Feb 24 12:50:42 Administrators-MacBook-Pro-15 mDNSResponder[30]: ------------ Cache -------------\ Feb 24 12:50:42 Administrators-MacBook-Pro-15 mDNSResponder[30]: Slt Q TTL if U Type rdlen\ Feb 24 12:50:42 Administrators-MacBook-Pro-15 mDNSResponder[30]: 28 269 -U- - AAAA 0 api-beta.mydomain.com. AAAA \ Feb 24 12:50:42 Administrators-MacBook-Pro-15 mDNSResponder[30]: 28 31 -U- - Addr 0 api-beta.mydomain.com. Addr \ 

从DNS故障中恢复一分钟后，将logging以下条目。

日志条目成功：

 Feb 24 12:52:55 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: Adding FD for uid 501\ Feb 24 12:52:55 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: DNSServiceCreateConnection START\ Feb 24 12:52:55 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: Error socket 30 created 00000000 00000001\ Feb 24 12:52:55 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: DNSServiceQueryRecord(5000, 0, api-beta.mydomain.com., Addr) START\ Feb 24 12:52:55 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: Error socket 30 closed 00000000 00000001 (0)\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: -- Sent UDP DNS Query (flags 0100) RCODE: NoErr (0) RD ID: 34816 29 bytes from port 62558 to 192.168.1.1:53 --\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 1 Questions\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 0 api-beta.mydomain.com. Addr\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 0 Answers\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 0 Authorities\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 0 Additionals\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: --------------\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: -- Received UDP DNS Response (flags 8180) RCODE: NoErr (0) RD RA ID: 34816 45 bytes from 192.168.1.1:53 to 192.168.1.2:62558 --\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 1 Questions\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 0 api-beta.mydomain.com. Addr\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 1 Answers\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 0 TTL 30 4 api-beta.mydomain.com. Addr 172.16.2.176\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 0 Authorities\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 0 Additionals\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: --------------\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: DNSServiceQueryRecord(api-beta.mydomain.com., Addr) ADD 4 api-beta.mydomain.com. Addr 172.16.2.176\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: Cancel 00000000 00000001\ Feb 24 12:52:56 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: DNSServiceQueryRecord(api-beta.mydomain.com., Addr) STOP\ Feb 24 12:52:59 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: DNSServiceCreateConnection STOP\ Feb 24 12:52:59 Administrators-MacBook-Pro-15 mDNSResponder[30]: 29: Removing FD\ Feb 24 12:53:18 Administrators-MacBook-Pro-15 mDNSResponder[30]: ---- BEGIN STATE LOG ---- mDNSResponder mDNSResponder-258.21 (May 26 2011 14:40:13)\ Feb 24 12:53:18 Administrators-MacBook-Pro-15 mDNSResponder[30]: Timenow 0x9145AF41 (-1857704127)\ Feb 24 12:53:18 Administrators-MacBook-Pro-15 mDNSResponder[30]: ------------ Cache -------------\ Feb 24 12:53:18 Administrators-MacBook-Pro-15 mDNSResponder[30]: Slt Q TTL if U Type rdlen\ Feb 24 12:53:18 Administrators-MacBook-Pro-15 mDNSResponder[30]: 28 113 -U- - AAAA 0 api-beta.mydomain.com. AAAA \ Feb 24 12:53:18 Administrators-MacBook-Pro-15 mDNSResponder[30]: 28 17 -U- Addr 4 api-beta.mydomain.com. Addr 172.16.2.176\ 

这是随机发生的，我能够每次重现这个情况，但是不能够理解错误的原因。

有谁知道为什么ping“未知的主机”失败，如何解决？

谢谢！