在centos7 GUI中安装pptp vpn client
需要安装ppp pptp pptp-setup 然后通过安装Nux Dextop第三方包来安装NetworkManager-pptp-gnome图形插件
附上文章链接https://www.jianshu.com/p/86d16189832e
Nux Dextop是类似CentOS、RHEL、ScientificLinux的第三方RPM仓库
步骤：
1安装Nux Dextop：
yum -y install epel-release
rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-5.el7.nux.noarch.rpm
2安装NetworkManager-pptp-gnome.x86_64
yum install NetworkManager-pptp-gnome.x86_64