On Sun, Jun 28, 2026 at 06:04:42PM -0700, William Herrin wrote: > On Sun, Jun 28, 2026 at 2:04 PM John Osmon <[email protected]> wrote: > > On Thu, Jun 25, 2026 at 03:29:15PM -0700, William Herrin wrote: > > > Should they have to be for use on the Internet with off-Internet uses > > > expected to use something like ULA? Or are off-Internet uses just as > > > qualified as Internet uses? > > > > I'm a proponent for unique address space at all times. Even an > > "off-Internet" network might need to interconnect with a new network > > (or, even, the Internet). > > > > Allowing unique address assignment means that if (when) such > > interconnection occurs, the formerly private network can coexist. > > Hi John, > > I take your statement to mean you favor off-Internet use being a valid > justification for ARIN IPv6 address registrations. Is that correct?
sorry for the ambiguity: I'm very much in favor of the issuance of registered/unique address space for people that wish to use IP, even if they aren't planning on connecting to other networks. > Bear in mind that IPv6 Unique Local Addresses under RFC 4193 are not > the same as RFC 1918. Like the rest of IPv6, the address space is much > larger and as the name implies the intent is that few if any users > select the same addresses. A simplification of the ULA rules boils > down to: generate a random number between zero and a trillion and then > add "fd" at the front. That's your /48 within fd00::/8. The birthday > paradox means overlap is not as unlikely as it might seem, but overlap > is still pretty unlikely. Yep. I've seen: fd00::/48, followed by fd01::/48 rolled out because "it's easier to remember and type." I often wonder how many fd00:dead:beef::/48 networks exist... > That said, having ARIN assign an address block guarantees that you > won't accidentally overlap without relying on any stochastic foibles. Stochastic human action seems to be predictable when you don't want it to be... > With this additional information, what are your thoughts? I favor "off-Internet" use as justification for address space, from ARIN or any other RIR. I reserve the right to change my mind as 2000::/3 dwindles, but until then I think I will remain in this camp. _______________________________________________ ARIN-PPML You are receiving this message because you are subscribed to the ARIN Public Policy Mailing List ([email protected]). Unsubscribe or manage your mailing list subscription at: https://lists.arin.net/mailman/listinfo/arin-ppml Please contact [email protected] if you experience any issues.
