Re: [v6ops] ref Hosts dont MLD to join LL groups
Alexandru Petrescu <alexandru.petrescu@gmail.com> Thu, 23 July 2015 11:43 UTC
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To: Ole Troan <otroan@employees.org>
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From: Alexandru Petrescu <alexandru.petrescu@gmail.com>
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Date: Thu, 23 Jul 2015 13:43:18 +0200
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Subject: Re: [v6ops] ref Hosts dont MLD to join LL groups
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Le 22/07/2015 14:27, Ole Troan a écrit : >> Regarding the mic discussion about unicast RAs a SHOULD. >> >> I have been directed that the reference saying that Hosts dont MLD >> to join multicast groups is RFC3810: >> >> " The link-scope all-nodes multicast address, (FF02::1), is >> handled as a special case. On all nodes -- that is all hosts and >> routers, including multicast routers -- listening to packets >> destined to the all-nodes multicast address, from all sources, is >> permanently enabled on all interfaces on which multicast listening >> is supported. No MLD messages are ever sent regarding neither the >> link-scope all-nodes multicast address, nor any multicast address >> of scope 0 (reserved) or 1 (node-local).” > > I do wonder if we should expand that exception to all link-scope > multicast addresses. > I would beg to disagree. If we expand that to all link-scoped groups, may lead to dismantling IPv6 dependence on 33::1 - ff:ff:ff:ff:ff would be sufficient. My oppinion would rather be to modify the MLD RFC to mandate MLD joins for all scopes. Ethernet has primitives for joining the corresponding link-layer groups, and in some cases they are used. Maybe all should use them. > the bridge implementors I speak to tell me that they don’t have > enough state to do MLD snooping for link-local scoped multicast > addresses anyway... This may be dumb from my side, but why dont bridge implementers use link-layer multicast? They shouldnt implement MLD, and not snoop it. The Hosts should send the necessary link-layer multicast joins (triggered by themselves sending MLD REPORT for these groups) to the bridge addresses. Alex > cheers, Ole >
- [v6ops] ref Hosts dont MLD to join LL groups Alexandru Petrescu
- Re: [v6ops] ref Hosts dont MLD to join LL groups Ole Troan
- Re: [v6ops] ref Hosts dont MLD to join LL groups Enno Rey
- Re: [v6ops] ref Hosts dont MLD to join LL groups Andrew 👽 Yourtchenko
- Re: [v6ops] ref Hosts dont MLD to join LL groups Alexandru Petrescu
- Re: [v6ops] ref Hosts dont MLD to join LL groups Ole Troan
- Re: [v6ops] ref Hosts dont MLD to join LL groups Alexandru Petrescu
- Re: [v6ops] ref Hosts dont MLD to join LL groups Enno Rey
- Re: [v6ops] ref Hosts dont MLD to join LL groups Alexandru Petrescu
- Re: [v6ops] ref Hosts dont MLD to join LL groups Enno Rey
- Re: [v6ops] ref Hosts dont MLD to join LL groups Alexandru Petrescu
- Re: [v6ops] ref Hosts dont MLD to join LL groups Owen DeLong
- Re: [v6ops] ref Hosts dont MLD to join LL groups Owen DeLong
- Re: [v6ops] ref Hosts dont MLD to join LL groups Alexandru Petrescu
- Re: [v6ops] ref Hosts dont MLD to join LL groups Owen DeLong