In their excellent article on NAT traversal[0], Tailscale mentions that the UC Berkeley guest wifi blocks all outbound UDP except DNS. EDIT: According to this[

In their excellent article on NAT traversal[0], Tailscale mentions that the UC Berkeley guest wifi blocks all outbound UDP except DNS. EDIT: According to this[1] issue, Berkeley guest wifi allows port 443, which would solve HTTP3/WebTransport. That's certainly hopeful, and I hope all networks are like this in the future. It's just not a forgone conclusion yet. [0]: https://tailscale.com/blog/how-nat-traversal-works#have-you-considered-giving-up https://tailscale.com/blog/how-nat-traversal-works#have-you-... [1]: https://github.com/danderson/natlab/issues/1 https://github.com/danderson/natlab/issues/1