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Tailscale has a superior implementation of NAT traversal, and they have a distributive network of fallback relay. If user has access to communication channels established by Tailscale, we can take advantage of that.
Tailscale does have a similar service called Taildrop. However, having a narrower feature scope and being independent of Tailscale allow acp to deliver a simpler interface.
There are two ways to pass files within a Tailnet:
Both sides of transfer can negotiate and see if method 1 is feasible, or else fallback to method 2 (e.g. one side is running in userspace networking mode).