Date: Fri, 19 Nov 2010 09:52:12 +0100 (CET) From: sthaug@nethelp.no To: siquijorphilips@gmail.com Cc: freebsd-net@freebsd.org Subject: Re: How to generate IPv6 RA without any prefixes? Message-ID: <20101119.095212.74667071.sthaug@nethelp.no> In-Reply-To: <AANLkTimu5SiyQye1iPaGCuMOjb0im%2BTHUmy=ET_mCcw-@mail.gmail.com> References: <AANLkTimu5SiyQye1iPaGCuMOjb0im%2BTHUmy=ET_mCcw-@mail.gmail.com>
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> > In IPv6 it should be possible to generate a Router Advertisement which
> > contains no prefix options (the idea being that I want the host to
> > populate its default router list but nothing else). However, I cannot
> > seem to get rtadvd to do this.
> >
> > If I start rtadvd with no /etc/rtadvd.conf file, it sends RAs with a
> > prefix option corresponding to the IPv6 address of the interface. In
> > the /etc/rtadvd.conf I can explicitly specify prefixes ("addr"), but
> > I can't find any way to specify that no prefix options should be sent.
> >
> > Any suggestions?
>
> You mean to say that you want your router to act as the default IPv6
> gateway only advertising default route via RA and the IPv6 prefixes
> are managed by other means such as DHCPv6 server?
Correct.
> Because by its the
> only way I can think of with your case now. You can specify
> 'pinfoflags' with 'l' in the /etc/rtadvd.conf to suppress the prefix
> information option being advertised.
Specifying a prefix ("addr") and "pinfoflags" with "l" makes rtadvd send
RAs with a prefix info option option which contains the onlink flag. It
certainly does not suppress the prefix info option.
Specifying a prefix ("addr") and "pinfoflags" without "a" makes rtadvd
send RAs with a prefix info option which does not contain the auto flag
- this prevents SLAAC from taking place.
I would like to get rtadvd to send RAs completely *without* a prefix
info option. My Juniper routers at work can do this just fine...
Steinar Haug, Nethelp consulting, sthaug@nethelp.no
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