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What would you do with a device like this
(sh.itjust.works)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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What you're saying is true, however VPNs connect both hosts and subnets. If you have a VPN server on your subnet, you can easily allow any client that connects to it to have access to your LAN.
VPNs are simply networking over encrypted tunnels. What you do with that tunnel is up to you.