> On 16 Dec 2021, at 23:35, Dino Farinacci <farina...@gmail.com> wrote: > >> If we don't want to share a common transmission resource, then why do we >> need globally unique addresses to use in IP packet headers? Locally unique >> addresses would do just as well. > > Just to answer this question specifically. We may not need globally unique > addresses. But I need a unique address for anyone I want to talk to and I > don't care what transmission networks my packets traverse. > > Therefore, we need unique addresses. However, lets say an address is 24 bits > long and we use a random number to generate the address. It is unlikely that > there will be an address collision for all the things I want to talk to. So > to me I get my unique address. Is it globally unique, well no, but maybe it > doesn't have to be. > > But there will be hosts that want to talk to everyone in the world or at > least beyond an address collision domain, so we default for the desire to > want/need globally unique addresses. So simply using a random number > generator for an IPv6 address may get us there and work sufficiently. > > Comments?
You touched an important point IMO. We default using globally unique addresses and as long as I have one (even temporarily) I use it for all my communications. May be this is one limitation we should explore how to overcome. I may want to use a locally unique address to communicate with my local devices, where I do not have strong privacy issues because I trust my own devices. I may want to use an address that allows me to access the local CDN cache to watch a movie and may be I do not care that much if the CDN identifies me with my IP address they already have my credit card number… I may want a globally unique address so that people can call me to wish me merry Xmass ;-) and at the same time I want my privacy so that ISPs do not know each and every call I receive … .. and I want all of the above at the same time.. I guess that my point is that we may want to use multiple different addresses, with different properties, at the same time. A similar point was made in: https://www.ietf.org/archive/id/draft-gont-v6ops-ipv6-addressing-considerations-01.txt <https://www.ietf.org/archive/id/draft-gont-v6ops-ipv6-addressing-considerations-01.txt> Ciao L. (I know I want a lot of things….:-) )
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