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Tailscale isn't using UPnP. See https://tailscale.com/blog/how-nat-traversal-works/ https://tailscale.com/blog/how-nat-traversal-works/

• trulyme 5y ago
  Sidenote: this is a fantastic writeup.
• istjohn 5y ago
  That was an interesting read. Turns out they do use UPnP, but it's just one of many tools they turn to when other techniques fail.