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Modern cars have some computers fitted into them, but not like the Tesla. It has an internal network, and one curious Tesla owner found a hidden four-pin connector and discovered that it is in fact an ethernet port. Basically, the Model S is one big network on wheels.

What he discovered next is notable for how strangely familiar it all is to anyone with even a passing knowledge of computer networking:
The car's internal 100 Mbps, full duplex ethernet network consists of 3 devices with assiged IP addresses in the 192.168.90.0 subnet, the center console, dashboard/nav screen and one more unknown device. Some ports and services that were open on the devices were 22 (SSH), 23 (telnet),53 (open domain), 80 (HTTP), 111 (rpcbind), 2049 (NFS), 6000 (X11). Port 80 was serving up a web page with the image or media of the current song being played. The operating system is modified version of Ubuntu using an ext3 filesystem.