Date: Sun, 23 Feb 2025 14:52:44 +0100 From: A FreeBSD User <freebsd@walstatt-de.de> To: Bob Bishop <rb@gid.co.uk> Cc: FreeBSD CURRENT <freebsd-current@FreeBSD.org>, "freebsd-net@freebsd.org" <freebsd-net@FreeBSD.org> Subject: Re: rtadvd(8) How to IPv6 tokenize interface identifier Message-ID: <20250223144203.7f61d0bf@thor.sb211.local> In-Reply-To: <2D84F83E-4548-40FA-B817-39703C670B43@gid.co.uk> References: <20250221075300.4466057d@thor.sb211.local> <2D84F83E-4548-40FA-B817-39703C670B43@gid.co.uk>
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[-- Attachment #1 --] Am Fri, 21 Feb 2025 10:44:12 +0000 Bob Bishop <rb@gid.co.uk> schrieb: > Hi, > > > On 21 Feb 2025, at 06:52, A FreeBSD User <freebsd@walstatt-de.de> wrote: > > > > Hello, > > > > Linux (especially OpenWRT we use) knows about a concept named "IPv6 tokenized interface > > identifier". The concept is self explanatory, a interface/router obtains a propagated > > prefix and the concept allows the explicit definition of the host portion. > > > > I haven't managed to accomplish such a behaviour using FreeBSD's rtadvd(8) daemon. I guess > > this task is subject of and performed through the rtadvd.conf(5) configuration file, but I > > haven't managed yet to accomplish such a task (to speak simple: I'd like to have a router > > of a subnet always at IPv6 Network PREFIX:0:0:0:1). > > Isn’t sufficient just to give the router a static IPv6 address? That’s what we do here. Hello. The router itself has on all inbound NICs static ULAs, ending as desired on "fc:/7-PREFIX::1". Using KAME dhcp6c, software from 2008(!), with a configuration obatined for delegating a prefix, each NIC - except tun0 for whatever reason - gets a prefix, the inbound NICs then seem to get a EUI64 generated IPv6 (although I sepcified "privacy", but this seems to be ignored, sadly ...). > > > The only config tag I can imagine is responsible for what I'd like to achive is the "addr" > > tag mentioned in rtadvd.conf(5), but whatever I fill this tag with - the desired effect is > > never achived (i.e addr="::0.0.0.1"). My "FreeBSD homebrewn" router has several networks, > > attached to vlan. Each interface is subject of an ULA prefix and an IPv6 prefix provided > > by our ISP. It is possible to pin the ULA toward the desired address, like > > addr="fd50:c450::1", but then the ISP provided prefix seems not to be set properly or is > > completely absent. Omitting "addr=" provides the interface with ULA prefix and ISP prefix > > - but obviously with the randomly generated 64bit host portion. > > > > Playing around with mutually suitable tags, like "pinfoflags", "raflags" or "rtflags" and > > having probed almost every possible combination (with or without some sense), it seems > > impossible to provide a) both ULA and ISP prefix pin the host portion to a desired 64bit > > address, like "PREFIX::1". > > > > I do not exclude that I'm possibly incapable of comprehension the manpage (the language is > > and the deeper semantics seem then to be hidden for me). So, if there is a clear > > expalanation how to achive the desired, please point me towards it (thanks in advance!). > > > > Linux has this feature since a while and I can not believe that FreeBSD lacks such a > > feature. > > > > Thank you very much in advance, > > > > O. Hartmann > > > > > > -- > > > > A FreeBSD user > > -- > Bob Bishop > rb@gid.co.uk > > > > -- A FreeBSD user [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iHUEARYKAB0WIQRQheDybVktG5eW/1Kxzvs8OqokrwUCZ7soRwAKCRCxzvs8Oqok rxDoAP0YSMsesSBXe+1o0NYxpLWXqSv7GOX992f+hO7mPWLRGQEAgrw6+F5PH+cP Z7xwzuKqcUfL7qWlOgW1ZVwy7jKz7QY= =201v -----END PGP SIGNATURE-----
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