> Le 23 août 2025 à 12:55, Christian Marangi (Ansuel) <[email protected]> a > écrit : > > Il giorno sab 23 ago 2025 alle ore 12:42 Goetz Goerisch > <[email protected]> ha scritto: >> >> Thank you for the feedback. >> >>>> 3. Saving the current IPv6 prefix on the WAN port (obtained from >>>> the ISP) to a file. If the router reboots due to power loss, and >>>> the ISP changes the IPv6 prefix in the next boot, the old prefix >>>> can be invalidated in a Router Advertisements to prevent IPv6 >>>> outages in the LAN due to stale addresses. This is known as "Flash >>>> Renumbering Workaround Across Reboot", a recommended feature by >>>> RFC 9096 to work around broken ISPs. This need is raised in a recent >>>> odhcpd development discussion [3], and is my motivation of sending >>>> this mail. >>> >>> I think this is the most useful feature. >>> >>> If implemented properly, it should result in a single write (per prefix >>> assignment from the ISP, which, for sane ISPs, means only 1) which is no >>> worse than the writes performed during firstboot: it shouldn’t be very >>> controversial. >> >> Unfortunately at least for residential users in Germany this means >> typically one write per 24h. As the prefix assignments are dynamic and >> ISPs even today still do force reconnects every 24h.
*ugh* that’s brain damaged. >> Although >> recommendations on best current operational practice e.g., RIPE 690 >> [1] exist. >> >> [1] https://www.ripe.net/publications/docs/ripe-690/ >> >> I would fully support that RFC9069 should be implemented for OpenWrt. >> > > We need to save it only on reboot so we don't need to write stuff > periodically every day. > Aside from panic conditions that we can't handle, we can attach any > kind of logic to be > done when reboot is called. As I was pointing out earlier, how many users do you think actually « reboot » their devices? (outside of OpenWrt devs, that is ;P) Panics are pretty irrelevant because the elephant in the room is it’s either going to be power loss, i.e. « let’s unplug it » (or actual power loss, even) or « it doesn’t work, let’s turn it off and on again », at which point a reboot (or more precisely a *shutdown*) handler will be totally useless. Cheers, T. _______________________________________________ openwrt-devel mailing list [email protected] https://lists.openwrt.org/mailman/listinfo/openwrt-devel
