Am Thu, 23 Aug 2012 13:43:32 +0200
schrieb "Eivind Olsen" <eiv...@aminor.no>:

> Hello.
> 
> I haven't seen this before.. I'm currently seeing someone (1 ip address)
> do about 2.1 million queries / hour where a majority of the queries seem
> to be:
> 
> b._dns-sd._udp.0.129.16.172.in-addr.arpa IN PTR +
> db._dns-sd._udp.0.129.16.172.in-addr.arpa IN PTR +
> r._dns-sd._udp.0.129.16.172.in-addr.arpa IN PTR +
> talk.l.google.com IN A +
> gmail-pop.l.google.com IN A +
> gmail-imap.l.google.com IN A +
> 
> ...and similar variations of these.
> 
> Have any of you seen something like this before?
> 


Hi Eivind,

these seem to be DNS Service Discovery requests and yes, we see loads of them 
on our servers.


http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt



Ciao
Torsten
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