Links Helpful links to setup cellular modems for Verizon and Sprint, WiFi connections, etc When ping -I does not work: ip rule For cell tower detection: Known hacks Cellular connections Modem in Linux Dialup in Linux Verizon modem NovaTel modem drivers Sprint Linux modem general Sprint Linux modem How to find cellular tower switch WiFi WiFi LAN Ethernet GRE Tunnel GRE Tunnel setup example IP forwarding for GRE Tunnel IP forwarding TCP Slowstart idle performance comparison Kernel Workqueue (for path-manager) Kernel Workqueue