Linux不能上网ping:unknown host问题怎么解决？

问题：ping 百度没法ping通，提示unknown host

[root@localhost ~]# ping www.baidu.com
ping: unknown host www.baidu.com

 

解决：

修改resolv.conf，增长两个dns地址（我增长的是合肥的），修改前须要锁定文件

[root@localhost ~]# vi /etc/resolv.conf
# Generated by NetworkManager

# No nameservers found; try putting DNS servers into your
# ifcfg files in /etc/sysconfig/network-scripts like so:
#
# DNS1=xxx.xxx.xxx.xxx
# DNS2=xxx.xxx.xxx.xxx
nameserver 202.102.192.68
nameserver 202.102.199.68

# DOMAIN=lab.foo.com bar.foo.com

[root@localhost ~]# chattr +i /etc/resolv.conf

保存后重启网卡
[root@localhost ~]# service NetworkManager restart

若是要从新编辑须要先解除锁定：
[root@localhost ~]# chattr -i /etc/resolv.conf

 

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其余命令： [root@localhost ~]# ifconfig -a [root@localhost ~]# cat  /etc/sysconfig/network-scripts/ifcfg-eth0