Date: Fri, 21 Feb 2025 17:45:09 +0000 From: Roy Marples <roy@marples.name> To: "Eugene Pereviazko" <john@dnepro.net> Cc: "freebsd-net" <freebsd-net@freebsd.org> Subject: Re: rtadvd(8) How to IPv6 tokenize interface identifier Message-ID: <195299cfe41.d7a8e8731186.6219551516433988607@marples.name> In-Reply-To: <a246f982-f0d9-9447-75d2-7c86bacea558@dnepro.net> References: <20250221075300.4466057d@thor.sb211.local> <a246f982-f0d9-9447-75d2-7c86bacea558@dnepro.net>
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Hi ---- On Fri, 21 Feb 2025 13:31:53 +0000 Eugene Pereviazko <john@dnepro.ne= t> wrote ---=20 > 21.02.25 08:52, A FreeBSD User =D0=BF=D0=B8=D1=88=D0=B5: > > Hello, > > > > Linux (especially OpenWRT we use) knows about a concept named "IPv6 to= kenized interface > > identifier". The concept is self explanatory, a interface/router obtai= ns 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 rtadv= d(8) daemon. I guess > > this task is subject of and performed through the rtadvd.conf(5) confi= guration file, but I > > haven't managed yet to accomplish such a task (to speak simple: I'd li= ke to have a router of a > > subnet always at IPv6 Network PREFIX:0:0:0:1). >=20 > Am I correct that you want your host to combine predefined host part=20 > (instead of eui64) with dynamically received prefix? >=20 > Like, set host part to ::DEAD:1 then receive 2001:db8:1234:4321::/64=20 > prefix from router and get your address of 2001:db8:1234:4321::DEAD:1? >=20 > Then rtadvd is not a tool for that. rtadvd is for advertising, not=20 > receiving advertisements. >=20 > If I'm not mistaken You should try dhcpcd from ports or packages,=20 > specifically "slaac token" verb, as I don't know of similar feature in= =20 > base system. >=20 > > Linux has this feature since a while and I can not believe that FreeBS= D lacks such a feature. > > > > Thank you very much in advance, =20 As Eugene said, you can use dhcpcd in ports with the slaac directive like s= o interface bge0 slaac token ::dead:beef Then you get ::dead:beef appended to each autoconf address from the RA. You could use ::1 for your token which should meet your needs as above. Good luck! Roy
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