在我刚刚安装一个Centos后，我无法获得yum ， wget或curl工作。 我所得到的是：
$ curl http://www.google.com curl: (6) Couldn't resolve host 'www.google.com 最令人惊讶的是，Ping似乎起作用了。
ping www.google.com
第一个反应，检查iptables：我没有任何规定。 正如我所说，新鲜安装。
nameserver 127.0.0.1 nameserver 8.8.8.8 nameserver 8.8.4.4
PS：尝试与http：//和没有。
删除nameserver 127.0.0.1的条目，它至less应该开始工作。
接下来修复你的本地parsing器
$ dig @8.8.8.8 www.google.com ; <<>> DiG 9.7.3 <<>> @8.8.8.8 www.google.com ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47139 ;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.google.com. IN A ;; ANSWER SECTION: www.google.com. 43199 IN CNAME www.l.google.com. www.l.google.com. 299 IN A 74.125.227.146 www.l.google.com. 299 IN A 74.125.227.145 www.l.google.com. 299 IN A 74.125.227.144 www.l.google.com. 299 IN A 74.125.227.148 www.l.google.com. 299 IN A 74.125.227.147 ;; Query time: 73 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Wed Aug 1 04:14:14 2012 ;; MSG SIZE rcvd: 132 $
$ dig @8.8.4.4 www.google.com ; <<>> DiG 9.7.3 <<>> @8.8.4.4 www.google.com ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 46533 ;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.google.com. IN A ;; ANSWER SECTION: www.google.com. 43152 IN CNAME www.l.google.com. www.l.google.com. 252 IN A 74.125.227.146 www.l.google.com. 252 IN A 74.125.227.145 www.l.google.com. 252 IN A 74.125.227.144 www.l.google.com. 252 IN A 74.125.227.148 www.l.google.com. 252 IN A 74.125.227.147 ;; Query time: 32 msec ;; SERVER: 8.8.4.4#53(8.8.4.4) ;; WHEN: Wed Aug 1 04:15:02 2012 ;; MSG SIZE rcvd: 132 $