Date: Fri, 17 Oct 2014 19:26:12 -0400 From: Zaphod Beeblebrox <zbeeble@gmail.com> To: prabhakar lakhera <prabhakar.lakhera@gmail.com> Cc: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: IPv6 stacks responds to all node link local multicast NS Message-ID: <CACpH0MdA6QLpRmWiy3-pYQDsES2wdrdXaJiREgQaBr7DYjR06w@mail.gmail.com> In-Reply-To: <CALg%2BrhVZFc=vE%2BnZS-hsm%2BUc54kZwzO6N8qThG9uv%2Be-e2uh5w@mail.gmail.com> References: <CALg%2BrhVZFc=vE%2BnZS-hsm%2BUc54kZwzO6N8qThG9uv%2Be-e2uh5w@mail.gmail.com>
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Urm ... question: is NS how, then, a client should be getting an IP over PPP? I have an l2tp server configured with mpd ... and I've noticed that mpd will allow me to turn on ipv6, but it won't assign addresses like ipv4. On Fri, Oct 17, 2014 at 2:28 PM, prabhakar lakhera < prabhakar.lakhera@gmail.com> wrote: > This probably is more of a compliance issue (or may be not as the NS > receipt section of RFC 4861 http://tools.ietf.org/html/rfc4861#page-62 > does > not talk about it). > > The neighbor solicitation message format says this: > > http://tools.ietf.org/html/rfc4861#page-22 > > > Destination Address > Either the solicited-node multicast address > corresponding to the target address, or the target > address. > > > Is it safe to assume that this is a MUST? > If yes, nd6_ns_input right now only checks if the destination is a > multicast or not (the check is more strict for DAD NS packets) and > therefore allows all node link local multicast address resolution NS > packets and process them completely (creates neighbor cache, responds > with NA etc). > > The fix is simple, however I wanted to know if there was some reason > to have it like this in the first place?: > > */** > ** Attaching target link-layer address to the NA?* > ** (RFC 2461 7.2.4)* > **** * NS IP dst is unicast/anycast MUST NOT add* > ** NS IP dst is solicited-node multicast MUST add** ** > ** In implementation, we add target link-layer address by default.* > ** We do not add one in MUST NOT cases.** */* > if (!IN6_IS_ADDR_MULTICAST > < > http://fxr.watson.org/fxr/source/netinet6/ident?v=FREEBSD10;im=bigexcerpts;i=IN6_IS_ADDR_MULTICAST > >(&daddr6)) > tlladdr = 0; > else > tlladdr = 1; > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >
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