This Tailscale blog [1] from 2020 has been posted on HN many times before I’m sure but is worth highlighting again as it does a great job outlining the technical complexities that CGNAT (and NAT in general) introduce.
I have my head in this space at the moment as I’m trying to implement NAT detection (as pioneered by Dublin traceroute [2]) into Trippy [3].
I have my head in this space at the moment as I’m trying to implement NAT detection (as pioneered by Dublin traceroute [2]) into Trippy [3].
[1] https://tailscale.com/blog/how-nat-traversal-works
[2] https://dublin-traceroute.net/
[3] https://github.com/fujiapple852/trippy/issues/1104