ping: unknown host www.baidu.com解决

转载自：http://www.cnblogs.com/happyhotty/articles/2539951.html"ping: unknown host www.baidu.com" 解决方案：    如果某台Linux服务器ping不通域名, 如下提示: [root@localhost ~]# ping www.baidu.comping: unknown host www.baidu.com首先确定已经连接上路由器，并且路由器能够访问外网，可以通过访问网关进行确定[root@localhost ~]# ping 192.168.1.1PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=2.96 ms64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=1.75 ms如果确定网络没问题的情况下, 可以通过如下步骤寻找解决办法: 1) 确定设置了域名服务器, 没有的话, 建议设置Google的公共DNS服务, 它应该不会出问题的 [root@localhost ~]# cat /etc/resolv.confsearch localdomain因为我的DNS没有设置所以导致了ping外网ping不通。将dns添加到该文件中[root@localhost ~]# vi /etc/resolv.confsearch localdomainnameserver 202.98.96.68nameserver 61.139.2.69~2) 确保网关已设置 # grep GATEWAY /etc/sysconfig/network-scripts/ifcfg* ------------------------------------------------------------------- /etc/sysconfig/network-scripts/ifcfg-eth0:GATEWAY=192.168.40.1 ------------------------------------------------------------------- 如果未设置, 则通过如下方式增加网关: # route add default gw 192.168.40.1 或者手工编写/etc/sysconfig/network-scripts/ifcfg*文件后, 重启network服务: # service network restart 3) 确保可用dns解析 # grep hosts /etc/nsswitch.conf ------------------------------------------------------------------- hosts:      files dns ------------------------------------------------------------------- 如果以上哪个有问题, 修正后, 再测试, 应该就没问题了: #ping -c 3 www.baidu.com PING www.a.shifen.com (220.181.6.175) 56(84) bytes of data. 64 bytes from 220.181.6.175: icmp_seq=0 ttl=50 time=9.51 ms 64 bytes from 220.181.6.175: icmp_seq=1 ttl=50 time=8.45 ms 64 bytes from 220.181.6.175: icmp_seq=2 ttl=50 time=8.97 ms --- www.a.shifen.com ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 8.450/8.977/9.511/0.446 ms, pipe 2