内网 dns dig 能解析出ip, ping 返回 Name or service not known

https://blog.csdn.net/jinyuxiaoqiang/article/details/78611430

https://blog.csdn.net/water_cow/article/details/7190880

vim /etc/nsswitch.conf

hosts: files mymachines myhostname resolve [!UNAVAIL=return] dns

hosts: files dns myhostname