On Jun 19, 2025, at 3:12 PM, Forrest Christian (List Account) via NANOG <nanog@lists.nanog.org> wrote: That is, if I switch to IPv6 on my eyeball network, how much of my existing traffic will I have to CGNAT in some way to reach the IPv4-only network? At NDSU we see between 55% and 65% of inbound traffic is IPv6. So if you are sizing your CGNAT box based on bandwidth it can be about half the size if you have IPv6 enabled everywhere. If you are sizing your CGNAT box based on flows/sessions rather than bandwidth the split is still about 50% for us. We have had IPv6 enabled on our entire campus network including wireless since 2008. Bruce Curtis Network Engineer / Information Technology NORTH DAKOTA STATE UNIVERSITY phone: 701.231.8527 bruce.curtis@ndsu.edu