An engineer watching my IPv6 Transition Mechanisms webinar sent me this question:
We would appreciate any insight you might have as to which transitional mechanisms the ISPs are actually deploying.
All of them ;)
- It started with 6rd used by ISPs who could not upgrade the access network to IPv6.
- I’ve seen plenty of ISPs using DS-Lite or CG-NAT.
IPv4-to-IPv4 CG-NAT is should be the hack-of-last-resort
for people who believe they cannot roll out IPv6 for whatever reason. Please try to do anything else but this. See also Lindsay's comment below.
- Some use MAP-T or variants with table-based mapping for address/port ranges into IPv6 endpoints (example: Deutsche Telekom). There are open-source products out there translating 20Gbps of MAP-T traffic per x86 core.
- Some mobile operators are deploying IPv6-only networks and using NAT64 (+464xlat) to get to IPv4-only content.
Have I missed anything? Please write a comment!