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DJB did have a proposal called AutoIPv6 which had both interoperability between v4 and v6: https://web.archive.org/web/20021017164820/http://cr.yp.to/proto/ipv6
by commandersaki 5y ago
DJB did have a proposal called AutoIPv6 which had both interoperability between v4 and v6: https://web.archive.org/web/20021017164820/http://cr.yp.to/proto/ipv6.html https://web.archive.org/web/20021017164820/http://cr.yp.to/p... . So in theory it's doable, but in practice I don't think the technologies used worked out.
Ultimately tunnelling and anycast is the way to do interoperability.
- welterde 5y agoIt doesn't really solve the main issue here in that IPv4-only hosts (which are not aware of IPv6-anything, have no 6to4, AutoIPv6, anything) cannot talk to IPv6 hosts. For the inverse direction there is the DNS64+NAT64 combo which works fairly well.
- commandersaki 5y agoI don't really see the issue to worry about IPv4-only hosts that are not IPv6-aware. Virtually all TCP/IP stacks connected to the Internet have IPv6-capabilities.
- welterde 5y agoBut if IPv6 is disabled or are not using 6to4/6rd if no native connectivity is available are they really IPv6 capable?