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This. ISP treating delegated prefixes the same way as a dynamic IP in IPv4 (as in, change it often and randomly) is one of my major pains as a user of IPv6. The
by avian 6y ago
This. ISP treating delegated prefixes the same way as a dynamic IP in IPv4 (as in, change it often and randomly) is one of my major pains as a user of IPv6. The whole network stack is very bad at handling this - it results in a very annoying, semi-broken network where things kind of work, but not really: hosts on local network might be reachable or not, depending on when they get the prefix change and adjust their global addresses accordingly. Hosts further uplink might be reachable or not, depending on when and in what sequence the ISP's routers get notified of the change. It's a nightmare if you want to have any kind of reliable connectivity.
- mjevans 6y agoI agree this is a major pain, however... fd00::/7 (technically fc00::/7 but IIRC the lower half is reserved) is supposed to be used for all local addresses and is equivalent to the private reserved ranges in IPv4. https://en.wikipedia.org/wiki/Unique_local_address https://en.wikipedia.org/wiki/Unique_local_address Getting connections to actually get MADE on the ULA first rather than a global address and to handle firewall rules... now THAT is the actual PITA.
- deleted 6y ago[deleted]
- ghaff 6y agoAs I understood it back in the day--which is how long IPv6 has been floating around--one of the whole ideas was that every smart dust mote or whatever would have its own fixed IP address. I'm not sure many people were thinking much about multi-tier edge architectures. There were central servers, maybe PCs, and then "things." And those things were going to exist in very large numbers and needed IP addresses.
- fulafel 6y agoIf your ISP is swapping prefixes on you without warning (vs giving you lifetimes and chance to deprecate old addresses) then they are providing bad v6 service and you should complain loudly. That said, it's still no worse than what you get with v4...