Domain-Name-System
我怎麼可能進行主機查找而不是捲曲?
有沒有人見過這個?請注意,這不僅發生在 google.com 上,而且發生在我嘗試的每個域中。這是一個無線連接(WEP),但我不確定這有什麼關係:
$ curl -v google.com # This takes about 60s to return * getaddrinfo(3) failed for google.com:80 * Couldn't resolve host 'google.com' * Closing connection #0 curl: (6) Couldn't resolve host 'google.com' $ wget google.com --2011-11-28 14:44:08-- http://google.com/ Resolving google.com... failed: Name or service not known. wget: unable to resolve host address `google.com' $ ping google.com PING google.com (209.85.148.147) 56(84) bytes of data. 64 bytes from fra07s07-in-f147.1e100.net (209.85.148.147): icmp_req=2 ttl=54 time=136 ms 64 bytes from fra07s07-in-f147.1e100.net (209.85.148.147): icmp_req=3 ttl=54 time=34.0 ms 64 bytes from fra07s07-in-f147.1e100.net (209.85.148.147): icmp_req=4 ttl=54 time=34.3 ms 64 bytes from fra07s07-in-f147.1e100.net (209.85.148.147): icmp_req=5 ttl=54 time=42.5 ms 64 bytes from fra07s07-in-f147.1e100.net (209.85.148.147): icmp_req=6 ttl=54 time=44.7 ms 64 bytes from fra07s07-in-f147.1e100.net (209.85.148.147): icmp_req=7 ttl=54 time=34.5 ms ^C --- google.com ping statistics --- 8 packets transmitted, 6 received, 25% packet loss, time 7007ms rtt min/avg/max/mdev = 34.063/54.376/136.026/36.758 ms $ host google.com google.com has address 209.85.148.106 google.com has address 209.85.148.147 google.com has address 209.85.148.99 google.com has address 209.85.148.103 google.com has address 209.85.148.104 google.com has address 209.85.148.105 google.com mail is handled by 30 alt2.aspmx.l.google.com. google.com mail is handled by 40 alt3.aspmx.l.google.com. google.com mail is handled by 50 alt4.aspmx.l.google.com. google.com mail is handled by 10 aspmx.l.google.com. google.com mail is handled by 20 alt1.aspmx.l.google.com. $ host google.com 192.168.1.201 Using domain server: Name: 192.168.1.201 Address: 192.168.1.201#53 Aliases: google.com has address 209.85.148.103 google.com has address 209.85.148.104 google.com has address 209.85.148.105 google.com has address 209.85.148.106 google.com has address 209.85.148.147 google.com has address 209.85.148.99 google.com mail is handled by 40 alt3.aspmx.l.google.com. google.com mail is handled by 50 alt4.aspmx.l.google.com. google.com mail is handled by 10 aspmx.l.google.com. google.com mail is handled by 20 alt1.aspmx.l.google.com. google.com mail is handled by 30 alt2.aspmx.l.google.com. $ cat /etc/resolv.conf # Generated by NetworkManager nameserver 192.168.1.201 $ cat /etc/hosts 127.0.0.1 localhost ::1 localhost $ netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 wlan0 127.0.0.0 127.0.0.1 255.0.0.0 UG 0 0 0 lo 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 wlan0
基本上任何應用程序,包括 Firefox,都無法進行名稱查找。更重要的是,如果我將 wifi 離線並插入乙太網電纜,一切都很好。
也許您有一些非常奇怪和限制性的 SELinux(或 grsecurity…)規則?
如果沒有,請嘗試
strace -o /tmp/wtf -fF curl -v google.com
從/tmp/wtf
輸出文件中找出發生了什麼。
使用這個:https ://www.centos.org/modules/newbb/viewtopic.php?topic_id=39343
我找到了一個幫助我排除故障的關鍵命令:
[root@localhost ~]# wget -6 URL Failed [root@localhost ~]# wget -4 URL Worked
這與導致某些實用程序出現問題的預設 ipv6 堆棧有關。禁用 ipv6 即可解決。