ping: unknown host www.baidu.com

Posted 2020-07-22 运维工匠实战(如果发现有错误请大家把正确的方法发送给我，方便

 

[[email protected] ~]# ping -c 2 www.baidu.com
ping: unknown host www.baidu.com

 如果出现上面的问题，先看DNS配置是否有问题：

[[email protected] ~]# cat /etc/resolv.conf 
options timeout:1 attempts:1 rotate
nameserver 10.202.72.116
nameserver 10.202.72.118

 

[[email protected] ~]# ping 10.202.72.116
PING 10.202.72.116 (10.202.72.116) 56(84) bytes of data.
^C
--- 10.202.72.116 ping statistics ---
29 packets transmitted, 0 received, 100% packet loss, time 28080ms

 

[[email protected] ~]# ping 8.8.8.8 -c 2
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

--- 8.8.8.8 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 10999ms

[[email protected] ~]# ping 8.8.8.8 -c 8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=41 time=57.6 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=41 time=58.8 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=41 time=57.3 ms
64 bytes from 8.8.8.8: icmp_seq=7 ttl=41 time=62.7 ms

--- 8.8.8.8 ping statistics ---
8 packets transmitted, 4 received, 50% packet loss, time 8005ms
rtt min/avg/max/mdev = 57.335/59.137/62.782/2.185 ms

 

[[email protected] ~]# cat /etc/resolv.conf
options timeout:1 attempts:1 rotate
nameserver 8.8.8.8
nameserver 4.4.4.4

 

[[email protected] ~]# ping www.baidu.com -c 2
PING www.a.shifen.com (220.181.111.188) 56(84) bytes of data.
64 bytes from 220.181.111.188: icmp_seq=1 ttl=52 time=3.82 ms
64 bytes from 220.181.111.188: icmp_seq=2 ttl=52 time=3.79 ms

--- www.a.shifen.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1170ms
rtt min/avg/max/mdev = 3.796/3.810/3.824/0.014 ms