The Vehicle Gateway is a MCU which manages data communication between different CAN channels. In Tesla Car, it also acts as an interface between Ethernet and CANBus to transfer/filter messages that passed from Infotainment System to internal CANBus network. Nowadays gateway is playing an important role on internal networks of vehicles, especially when car is equipped with Internet access(aka Connected Cars). In this talk, we’ll present the design and Implementation of vehicle gateways, and we’ll reveal the mystery of Gateway in Tesla Car, such as how we reverse firmwares of gateway, how gateway manages its services like shell, filesystem, network, logging etc.