AFWall+ (Android Firewall +)
***ROOT REQUIRED*** If you don’t know what root is, please search for “How to root android” in the Internet.
AFWall+ (Android Firewall +) is a front-end application for the powerful iptables Linux firewall.It allows you to restrict which applications are permitted to access your data networks (2G/3G and/or Wi-Fi and while in roaming). Also you can control traffic within LAN or while connected through VPN.
More info on new permission – android.permission.ACCESS_SUPERUSER
PERMISSIONS & FAQ
INTERNET permission is only required for LAN functionality (API limitation)