On Thu, Nov 20, 2025 at 11:05:25AM +1100, David Gibson wrote: > On Wed, Nov 19, 2025 at 12:42:04PM +0100, Stefano Brivio wrote: > > On Tue, 18 Nov 2025 14:34:58 +1100 > > David Gibson wrote: > > > > > On Tue, Nov 18, 2025 at 01:19:21AM +0100, Stefano Brivio wrote: > > > > On Fri, 14 Nov 2025 10:21:46 +1100 > > > > David Gibson wrote: [snip] > > > I'm not really sure what you mean by an "equivalent untranslated > > > address". AFAIK, the only non-wildcard case that will actually listen > > > on both IP versions is a v4-mapped address. > > > > I mean 192.0.2.1 (untranslated, IPv4) and ::ffff:192.0.2.1 (v4-mapped). > > Will we ever want to listen to both? > > Maybe one day, but not soon, I think. > > > I don't think we have to care about that right now, though. > > Agreed. So, I couldn't find anything definitive, but fwiw I did find a couple things suggesting that v4-mapped addresses probably shouldn't ever appear on the wire: https://datatracker.ietf.org/doc/html/draft-itojun-v6ops-v4mapped-harmful-02 https://lwn.net/Articles/688630/ -- David Gibson (he or they) | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you, not the other way | around. http://www.ozlabs.org/~dgibson