[AusNOG] multicast addresses

[Mark ZZZ Smith]

----- Original Message -----
> From: Alex Samad - Yieldbroker <Alex.Samad at yieldbroker.com>
> To: "ausnog at lists.ausnog.net" <ausnog at lists.ausnog.net>
> Cc: 
> Sent: Tuesday, 2 December 2014, 12:22
> Subject: Re: [AusNOG] multicast addresses
> 
> If only I had looked for a few more seconds
> 
> 239.192.0.0/14 I think is the one ?
> 

Going by RFC6308, "Overview of the Internet Multicast Addressing Architecture", that looks like a range you could use as it is the Organisation Local scope. However, as with RFC1918s, you could have problems with lack of uniqueness and colliding groups if you happened to want to join to another network that is using that multicast address space.

The GLOP space John Edwards mentioned or the Unicast-Prefix-Based Allocation space (RFC6034), used with a globally unique IPv4 prefix <= /24, would avoid that problem.

Of course, IPv6 has none of these issues, as there is plenty of room to embed 4 byte ASNs or a unicast /64 prefix or shorter in the multicast address space and still have room for 4 billion multicast groups. (see the slides starting at slide number 87 in http://www.users.on.net/~markachy/nvtkaipv6.pdf )


> Alex
> 
>>  -----Original Message-----
>>  From: Alex Samad - Yieldbroker
>>  Sent: Tuesday, 2 December 2014 12:22 PM
>>  To: ausnog at lists.ausnog.net
>>  Subject: multicast addresses
>> 
>>  Hi
>> 
>> 
>>  Is there a range in the class D set that is similar to the non-routable 
> ipv4
>>  address ranges.
>> 
>>  Looking for multicast range that is meant to stay in house, but I don't 
> want to
>>  clash later.
>> 
>>  Alex
> 
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