VPN服务器
http://www.softether-download.com/files/softether/v4.27-9668-beta-2018.05.29-tree/Linux/SoftEther_VPN_Server/64bit_-_Intel_x64_or_AMD64/softether-vpnserver-v4.27-9668-beta-2018.05.29-linux-x64-64bit.tar.gz
