服务器模拟断网
1、先备份一下，以后想连网还能恢复
cat /etc/resolv.conf > /etc/resolv.conf.bak
清空配置
echo “” > /etc/resolv.conf
2、恢复
cat /etc/resolv.conf.bak > /etc/resolv.conf
cat /etc/resolv.conf > /etc/resolv.conf.bak
echo “” > /etc/resolv.conf
cat /etc/resolv.conf.bak > /etc/resolv.conf