nslookup工作，但是ping由于DNS错误而失败。
nslookup工作，但是ping由于DNS错误而失败。
提问于 2014-02-24 12:59:46
我正在使用MacOSX10.6.8。当我试图ping某个特定的域时，它会返回“未知主机”，但是当我在同一台主机上运行nslookup时，它会立即返回正确的IP。
Ping继续抛出DNS错误近一分钟，然后自动恢复。
我查看了我的系统的/var/log/system.log，并发现了在失败时记录的以下条目。我使用以下命令获取调试日志。
"killall -USR1 mDNSResponder"
"killall -USR2 mDNSResponder"
"killall -INFO mDNSResponder"失败期间的日志条目：
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 \在从DNS故障中恢复一分钟后，将记录以下条目。
成功期间的日志条目：
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，我每次都能复制这个案例，但无法理解错误的原因。
有人知道为什么ping与“未知主机”失败以及如何解决吗？
谢谢!
回答 1
Server Fault用户
发布于 2014-02-24 13:14:56
您熟悉mDNS与正常的regluar是如何不同的吗？我不想无礼，但我想指出的是，它们是两个试图解决类似问题的不同系统，但重要的是不要混淆这两个系统。
因此，为了回答您的问题，您似乎连接到多个网络，并且通过mdns接收冲突或不频繁的响应。具体来说，从您的日志文件中可以得到mdns响应，指示为192.168.1.2接口上的api-beta.mydomain.com提供了172.16.2.176，这似乎没有多大意义。
nslookup应该直接查询DNS服务器的答案，因为您表示它工作正常，所以我怀疑mdns只是简单地混淆了一切。我建议您使用来自apple的以下说明禁用mdns单播解析：
http://support.apple.com/kb/HT3789
我希望这能起作用！祝好运
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原文链接：
https://serverfault.com/questions/577861
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