How does the internet know what to send me if I'm on wifi with a bunch of ppl?
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Cookies
Cookies are just for identifying sessionson websites, for any other traffic it's the router's job to figure out which traffitc it gets goes where. Brown Linux man made a video on NATwhich allows only 1 public IP address to work for a whole LAN https://www.youtube.com/watch?v=BNZcL--JesM