ietf-drafts/unicast-extensions
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Dropped in the multicast mess

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Dave Taht
2019-02-12 09:41:05 -08:00
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rfcs/draft-taht-landley-v4uniext-mcast.md
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%%%
title = "Converting some IPv4 multicast allocations to unicast"
title = "Converting Additional IPv4 multicast allocations to unicast"
abbrev = "224-v4uniext"
updates = [2827, 3330, 6890]
ipr = "trust200902"
@@ -110,11 +110,32 @@ reprogrammed, but leaving them a /16 seems polite? (Heck a /24 would
probably be plenty, but a /16 means you don't have to update the NTP
RFC...)
In [@!RFC5771] IANA was directed.
In [@!RFC5771] IANA was directed to re-evaluate the multicast allocations
periodically.
GLOP Addressing [@!RFC3180],
Even the largest multicast block is only 5% allocated.
https://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml
## The multicast mess
224.5 and up have no reservations
224.252/14 – DIS transient groups
https://tools.ietf.org/html/rfc5771 Asked
225/-231/8 Reserved for future use
232/8 - Source-Specific Multicast Block
233.0.0.0-233.251.255.255 GLOP Block [RFC3180]
233.252.0.0/24 – MCAST-TEST-NET
233.252/14 AD-HOC Block III
234.0.0.0-234. 255.255.255 Unicast-Prefix-based IPv4 Multicast Addresses [RFC6034]
235.0.0.0-238.255.255.255 Reserved [IANA]
239/8 reserved for the mbone (obsolete for 12 years)
https://tools.ietf.org/html/rfc2365
https://tools.ietf.org/html/rfc3180
https://tools.ietf.org/html/rfc4607 SSM
# Implementation guidelines