Post #2358499
2026-05-04 19:28 UTC
@kasperd@westergaard.social I don’t care whether new applications are using IPv4-mapped addresses internally, towards the local network abstraction or in persistent storage.
I violently fight any attempts to put them in DNS or packets sent to the wire.
Replies (1)
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@kasperd@westergaard.social 2026-05-04 21:52
I absolutely agree IPv4-mapped addresses have no place in DNS. The one place I have seen them used on the wire is as source address when some NAT64 gateway translates ICMP error messages into ICMPv6. I also think that’s wrong (they should be using their NAT64 prefix instead), but it’s not harmful in the same way that IPv4-mapped addresses in DNS are. I can’t come up with any scenario where IPv4-mapped addresses on the wire would be a good idea.