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Re: [MBONED] [Ext] Re: ipv4 multicast address ranges, actual usage.

Leonard Giuliano <lenny@juniper.net> Thu, 19 December 2019 22:39 UTC

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Date: Thu, 19 Dec 2019 14:39:31 -0800
From: Leonard Giuliano <lenny@juniper.net>
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To: "Manfredi (US), Albert E" <albert.e.manfredi@boeing.com>
CC: Dave Taht <dave.taht@gmail.com>, "mboned@ietf.org" <mboned@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mboned/wfY0K1YpRNiFdyHuwjouBCN1djg>
Subject: Re: [MBONED] [Ext] Re: ipv4 multicast address ranges, actual usage.
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Well, 225/8-231/8 and 235/8-238/8 are unassigned/reserved, so there's 
nothing to reclaim since there is no valid use of it in the first place 
(ie, they are squatters).

That said, I suspect there are much bigger technical issues with 
reassigning chunks of Class D space into unicast (beyond the linux source 
code).  I'm not a hw guy, but I imagine there's a lot of silicon out there 
that will not forward 224/4 packets using the unicast forwarding path.


On Thu, 19 Dec 2019, Manfredi (US), Albert E wrote:

| -----Original Message-----
| From: MBONED <mboned-bounces@ietf.org> On Behalf Of Dave Taht
| 
| > I would love to collect more feedback and bug reports regarding that
| before we finally gird ourselves up for the ietf gauntlet. As things
| stand today, although I'd really like as much feedback as possible, I
| do not see a problem (over a 10 year timespan) with turning
| 225/8-231/8 into unicast.
| 
| I think this is a bad idea. It would be okay to turn those multicast blocks into private multicast blocks, like 239/8, but to make them unicast blocks is asking for trouble. And probing the Internet, and finding that they "aren’t used," won’t explain why.
| 
| The fact is, whether done legally or not, networks do use 224/8 and 230/8, and likely others in that range, for internal IP multicast use, today. People don’t seem to obsess about RFC 2365 and 5771 sufficiently, it seems.
| 
| So, if we think that reclaiming some of those address blocks is a good idea, then I'd say, only if the reclaimed blocks are also used for multicast!
| 
| Bert
| 
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