Does BIND9 support broadcast/multicast query?

Danny Mayer mayer at gis.net
Wed Dec 28 13:45:27 UTC 2005


Hideshi Enokihara wrote:
> On Wed, 28 Dec 2005 09:17:59 +1100
> Mark Andrews <Mark_Andrews at isc.org> wrote:
> 
> 
>>
>>
>>	BIND 9 does not support multicast queries.  It does not
>>	have code to join a multicast group so it will never recieve
>>	multicast queries.
>>
>>	As for broadcast queries it will respond to them however there
>>	is no code in the resolver to special case that the source
>>	address of the reply won't match the address the query was
>>	sent to.
> 
> 
> I tried to test for broadcast query.
> But, BIND9 did not send response for the broadcast query. 
> 

BIND 9 doesn't have code to listen for broadcast or multicast packets.
It only listens for packets sent to its Unicast addresses. I'm not sure
why Mark is saying that it will respond to broadcast queries since it's
not listening for broadcast address packets and that needs to be set up
in the code and that code isn't there. I know because I had to implement
it when I reused the code in NTP.

Danny



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