All things related to multicast

[David Farmer <>]

MDNS RFC 6762, AKA Bonjour, uses a  link local multicast address 224.0.0.251. 
 I've been trying to figure out what it.  So far I'm not sure what it is, but 
it's not normal Bonjour.  239.0.0.0/8 is Organization Local multicast.  

Sent from my iPhone

On Aug 5, 2013, at 17:45, Jeffry Handal 
<>
 wrote:

> Eldon, at al.
> 
> With your feedback about being Apple machines and a colleague here at LSU, 
> we found that it may be the very group that Bonjour runs on. We checked a 
> machine we have access to and ran iTunes on it with Windows 7 as its OS. It 
> installs bonjour in the backend. Checking on the command prompt with 'netsh 
> int ip show joins,' that machine is requesting to join. The mystery may 
> well be solved now...
> 
> The difficulties here were: bonjour is not very well document on the web; 
> this group does not build the shared multicast tree as other software does.
> 
> Any way, thank you everyone for their feedback. Feel free to contribute on 
> any more insights. This is just an initial educated guess.
> 
> Regards,
> 
> Jeffry J.Handal,  SMIEEE, MSEE, PE
> Manager, Network Engineering and Architecture
> Univeristy Networking and Infrastructure
> Louisiana State University
> Office: (225)578-1966
> Fax:    (225)578-6400
> 
> On 8/5/2013 17:29, Eldon Koyle wrote:
>> We see that group a lot also.
>> 
>> I don't know specifically what the traffic is, but it all seems to be
>> coming from Apple devices (based on a spot check of about 6 edge ports).
> 
>