Using a nested wireless LAN router / Split Tunneling based on port by /etc/ppp/ip-up.d
Using a nested wireless LAN router
http://ubuntuguide.org/wiki/Ubuntu_Trusty_Networking#Network_Manager
Split Tunneling based on port by /etc/ppp/ip-up.d
https://wiki.archlinux.org/index.php/PPTP_VPN_client_setup_with_pptpclient