[dhcwg] Re: mboned: draft-jdurand-assign-addr-ipv6-multicast-dhcpv6-00 comments
Stig Venaas <Stig.Venaas@uninett.no> Sun, 01 August 2004 18:10 UTC
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Date: Sun, 01 Aug 2004 19:44:09 +0200
From: Stig Venaas <Stig.Venaas@uninett.no>
To: Pekka Savola <pekkas@netcore.fi>
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Cc: dhcwg@ietf.org, mboned@lists.uoregon.edu
Subject: [dhcwg] Re: mboned: draft-jdurand-assign-addr-ipv6-multicast-dhcpv6-00 comments
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On Sun, Aug 01, 2004 at 06:03:48PM +0300, Pekka Savola wrote: [...] > have RFC3306 or embedded-RP; it is not clear which problem we're solving > (and which problems remain to be solved). > > In particular, if any host on a link with a /64 prefix could calculate its > own multicast prefix (unique to that link) on its own, and have 32 bits of > group-id's to pick from (making sure they don't conflict on that link), > could one argue that there is no need for central multicast address > assignment.. but rather a mechanism where the host could pick a group-id in > such a way it doesn't conflict (a random process should be sufficient, but > if not, there could be Multicast DAD)? Yes, I've also thought a bit about this. The 64-bit link-id could be a starting point too. I think some form of DAD would be nice. It must also be possible for a host to have multiple groups. > Similarly, if embedded-RP is used, what you could need is the information > what is the address of the RP or which prefix one should use for picking the > multicast addresses. > > So, looking at from a different perspective, it would seem that we don't > necessarily need DHCPv6 for address assignment itself, but maybe some other > configuration mechanism to figure out the multicast prefix which belongs on > the link. Yes, sounds good. So question then is whether DHCP or something else should be used. WRT Embedded-RP I think allocating a prefix to the link, as you suggest, is better than telling the application what the Embedded-RP address is (applications shouldn't need to know about Embedded-RP details). I see some possible issues. There might be a need for giving hosts different prefixes for different scopes (you could imagine having one prefix where simply the scope bits are set to whatever scope is needed). I think there are cases where you might use say Embedded-RP internally (with small scope) and prefix-based addressing externally (with larger scope) or vice versa. Or where you may want different RPs for different scopes. Well, in short, I also think the fact that we only need uniqueness per link, should simplify things quite a bit. I would be happy to work on possible solutions to this. Stig _______________________________________________ dhcwg mailing list dhcwg@ietf.org https://www1.ietf.org/mailman/listinfo/dhcwg
- [dhcwg] draft-jdurand-assign-addr-ipv6-multicast-… Pekka Savola
- [dhcwg] Re: mboned: draft-jdurand-assign-addr-ipv… Stig Venaas
- [dhcwg] Re: mboned: draft-jdurand-assign-addr-ipv… Pekka Savola
- [dhcwg] Re: mboned: draft-jdurand-assign-addr-ipv… Stig Venaas
- [dhcwg] Re: mboned: draft-jdurand-assign-addr-ipv… Jean-Jacques Pansiot