Tom Hill wrote: > On 27/04/2020 16:08, Paul Bone wrote: > > Several years ago I did trial a whole manner of IPv4/IPv6 > > translation solutions and at the time came to the conclusion that > > the best solution was double stacking. > > Several years is a very long time in IPv6, and we here in this > community need many more proponents, rather than accidental > detractors. ;)
Dual stack networks are a pain to manage as an ISP. You almost end up doubling your IP address and routing management overhead. The "easy" solutions are MAP-T, MAP-E, or IPv4 Residual Deployment. Sadly neither is any use unless you control the CPEs, because very few CPE vendors support them. For efforts in that direction, see e.g. https://tools.ietf.org/html/draft-xli-v6ops-cernet-deployment-03 However, that is not exactly deployable in 2020 for business customers. So far it appears that only dual stack will work there. It is different if you primarily serve cell phones; they work reasonably well with 464XLAT (RFC 6877) or similar.
