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

Leonard Giuliano <lenny@juniper.net> Wed, 18 December 2019 20:49 UTC

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Date: Wed, 18 Dec 2019 12:48:58 -0800
From: Leonard Giuliano <lenny@juniper.net>
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To: Dave Taht <dave.taht@gmail.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mboned/fo4gU76sqATWBtRgRO_68rIb9lQ>
Subject: Re: [MBONED] ipv4 multicast address ranges, actual usage.
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Dave,

Take a look at RFC6308 and RFC 5771 for an overview of multicast 
addressing.  But to summarize, 232/8 is reserved for SSM (RFC4607).  
233/8 is reserved for GLOP (RFC3180).  234/8 is reserved for 
Unicast-Prefix-Based Allocation (RFC6034).  239/8 is reserved for admin 
scoped allocation (RFC2365).

Hope this helps,
Lenny 

On Wed, 18 Dec 2019, Dave Taht wrote:

| As a few people know I've been working (quixotically) in my spare time
| towards making more of the IPv4 address space generally usable. We've
| landed patches for 0/8 in linux, and 240/4 had already been mostly
| made working a decade back.
| 
| Now we come against a harder problem, in that 1) - a vast swath of
| multicast address space was never allocated for anything by iana
| (225/8-231/8) and 2) 232/8-238/8 appears severely underutilized. Only
| portions of 224/8 and 239/8 seem to have any usage at all.
| 
| We've successfully made that first formerly multicast range pretty
| generally usable in a string of patches on our github for various oses
| and routing daemons. https://github.com/dtaht/unicast-extensions - and
| for a drafty draft of a draft internet draft, see:
| https://github.com/dtaht/unicast-extensions/blob/master/rfcs/draft-gilmore-taht-v4uniext.txt
| 
| My question today, though (lacking finding a mailing list more
| suitable than this - is there one?), is to what extent are the various
| allocations in the 232/8 to 238/8 range actually used today, and for
| what?
| 
| 
| -- 
| Make Music, Not War
| 
| Dave Täht
| CTO, TekLibre, LLC
| https://urldefense.com/v3/__http://www.teklibre.com__;!!NEt6yMaO-gk!ToLvTOd6t8dQ1-sH4XmghgDQrcb4JVFwnxuPeA-h4IwQmqxaVhSKHdAeEcHC_4g$ 
| Tel: 1-831-435-0729
| 
| _______________________________________________
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