I proposed a 'fix' or, at least, a new feature to specify prefix lifetimes about a half-year ago which @Ansuel just reviewed a few days ago.
See [RFC PATCH 08/14] router: clamp prefix valid_lt to interface valid_lifetime which... ideally should go in a separate patch (but this version depended on changes in the named patch-set) It's in his inbox for further review/merge. Otherwise prefixes stick around forever and start fucking shit up in your environment. I triggered a DoS in some systems which I won't name because of this >:) On 2024-11-20 16:54, chriss wrote: > Hi > > I have the following scenario: > > - a router with openwrt > > - a (german) VDSL connection with IPv4 and IPv6 > > - a delegated IPv6 prefix (/56) that I use in my internal LAN segments > > My problem: > > I happens that I have to reconnect my VDSL (update of router, tripped over > cable, whatever) - with that I get a new IPv6 prefix delegated. Now my > clients have 2 prefixes/addresses. The old one (before the router > reboot/reconnect) and a new one. That's bad because the old one won't route > anymore. simple solution: set the lifetime to sth like 5min or so and the old > addresses gets deprecated fast enough. > > Now my ULA addresses have also a lifetime of 5min - which is bad because > after 5 min of router downtime (update) I lose my local delivery between > clients. > > My solution (to this very specific and edge case problem) would be to set a > large lifetime for ULA prefixes and use a short one for WAN delegated. > > My idea would be to allow the user to set (optional) a ULA lifetime where one > can specify the ULA prefix. The odhcpd process would then use this config > entry and send RA with the respective lifetime. > > > I write to gather feedback and maybe alternative solutions and if a path / PR > for my solution would be accepted. > > > > kind regards > > //chriss > > > _______________________________________________ > openwrt-devel mailing list > openwrt-devel@lists.openwrt.org > https://lists.openwrt.org/mailman/listinfo/openwrt-devel _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
