[Unbound-users] multicast address alerts in logs

Phil Mayers p.mayers at imperial.ac.uk
Sat Mar 5 11:49:34 UTC 2011

On 03/05/2011 05:39 AM, bmanning at vacation.karoshi.com wrote:
> On Fri, Mar 04, 2011 at 08:56:17PM -0500, Michael Watters wrote:
>>> That's not a multicast address; it's an (unusable) class-E 240/4 address.
>>> Weird to see traffic to it...
>>> Maybe someone has some bad glue?
>> That's entirely possible.  These servers are handling queries from
>> thousands of servers and I'm sure that some domains have bad records.
>> Each server has interface tracking set to automatic and the anycast
>> IPs are on loopback interfaces.  The messages don't seem to be causing
>> any problems but I'd like to figure out what's causing them.
> 	there is a modification to unbound that allows it to
> 	use IPv4 multicast addreses to discover other DNS servers	

But as I said "" is not a multicast address.

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