Dnia 15.10.2024 o godz. 18:28:37 Nico Schottelius via Postfix-users pisze: > > > Your comparison to IPv6 vs IPv4 isn't very good, as everybody tries to do > > their best to level the barrier between IPv6 and IPv4, not strenghten > > it. > > tbh, I think this is only true to a small degree for DS-Lite approaches > using MAP-T or NAT64. > > > That's why dual stack still is (and probably will be in the foreseeable > > future) still a thing. > > I think you are very mistaken on that one, as dual stack complexity is > significantly higher than single stack. > > > Nobody is setting up IPv6-only servers, unless they are experimental servers > > meant to be used only by closed group of users, and not generally reachable > > from the Internet. Who would like to setup eg. an IPv6-only website, thus > > cutting themselves off of half of the Internet? > > I could send you quite some documents about IPv6 only hostings, but I > believe that is really going too far offtopic. In a nutshell, IPv6 only > hostings are much easier, more sustainable and the only thing that you > need is a border gateway/translator, if communication to the IPv4 world > is required.
In broad sense, I will still consider using such gateways/translators as "dual stack". By using this term, I was meaning that both protocols are used simultaneously in the Internet, and people do their best to make them interoperable, and not function as two separate worlds. Not going into the implementation details, the bottom line is: - a server, even if it's "locally" IPv6-only, has some provisions in place in order to be available over IPv4 as well - a client connection, even if it's "locally" IPv6-only, has some provisions in place in order to reach IPv4 addresses as well. There are virtually no general-use IPv6 hosts that cannot communicate - this or other way - with IPv4 addresses (again, with the exception of experimental networks intended for closed groups of users, for research, testing etc.). This isn't the case for your planned "secure email" system. Especially, I understand there will be no possibility (in general) to send mail from a "normal" email world to "secure email" system. In the other direction, the operator of a "secure email" system may put some provisions in place to be able to send mail from "secure email" system to "normal" email recipient (but I'm not sure what about a reply?). Do I understand you correctly? That's why I called it "walled garden". Anyway, as this discussion has little to do with Postfix, I think we should end it here and - if you wish so - move to the "mailop" list as someone suggested. -- Regards, Jaroslaw Rafa r...@rafa.eu.org -- "In a million years, when kids go to school, they're gonna know: once there was a Hushpuppy, and she lived with her daddy in the Bathtub." _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
