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

On Wed, Dec 18, 2019 at 12:49 PM Leonard Giuliano <lenny@juniper.net> wrote:
>
> 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).

I had already reviewed those pretty thoroughly in writing the drafty draft.

The question was:

"to what extent are the various allocations in the 232/8 to 238/8
range actually used today, and for
what?"

The "for what" portion of the question was: what applications today
actually use GLOP? or RFC6038? or SSM?

What mailing list or list might have some answers to the actual usage
of these ranges?

As best as I can tell actual multicast usage of ipv4 is down to the
dozens of applications (all with allocated ip address in 224 or 239 -
with mdns topping the list.
>
> 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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> |

-- 
Make Music, Not War

Dave Täht
CTO, TekLibre, LLC
http://www.teklibre.com
Tel: 1-831-435-0729