The Everything Feed - All Packet Pushers Pods IPB187: IPv6 RFC Updates
Nov 6, 2025
The discussion dives into the latest updates on IPv6 standards, focusing on RFC 6052 and its crucial role in IPv6-to-IPv4 translation. Experts debate the implications of prohibiting the translation of private IPv4 addresses and highlight the need for changes in implementations. They also explore RFC 8215, weighing its utility against the option to deprecate it. Additionally, a new testing site, IPv6.army, emerges after the closure of testipv6.com, offering insights into performance comparisons between IPv4 and IPv6.
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RFC 6052 Diverges From Implementation
- RFC 6052's 'must not' about translating private IPv4 space is widely ignored in practice.
- Nick found no implementations that enforce that rule, so the RFC and reality diverge.
Fix Docs Not Implementations
- Update the RFC to match deployed behavior rather than forcing broken implementations to change.
- Changing the document reduces future divergence and implementation surprise.
Well-Known Prefix Has Leak Risks
- The well-known NAT64 prefix poses potential routing and security risks if leaked on the global internet.
- Nick and Ed note that not everyone filters such prefixes, so leakage remains a concern.