indeed, Tailscale was the first to realise this. We added specific 4G and 5G mobile features. these carrier-grade boxes have often non-random port allocations.

indeed, Tailscale was the first to realise this. We added specific 4G and 5G mobile features. these carrier-grade boxes have often non-random port allocations. "By relying on provider-aware IPv4 range allocations, provider-aware port prediction heuristics, high bandwidth probing, and the birthday paradox we can successfully bypass even symmetric NATs."