Date: Sat, 28 Feb 2009 06:52:29 -0500 From: Michael Powell <nightrecon@verizon.net> To: freebsd-questions@freebsd.org Subject: Re: Odd DNS requests Message-ID: <gob8g9$uu2$1@ger.gmane.org> References: <20090228161606.N71460@sola.nimnet.asn.au>
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Ian Smith wrote: > Hi, > > recently we've had a Mac notebook of some sort on our LAN, that likes to > make these DNS queries from time to time, to no avail, as noticed on a > filtering bridge between the LAN and the router+DNS at 192.168.0.1: > > 16:13:05.020397 192.168.0.59.53207 > 192.168.0.1.53: 63162+ PTR? > b._dns-sd._udp.0.0.168.192.in-addr.arpa. (57) [tos 0x18] > 16:13:05.021093 192.168.0.1.53 > 192.168.0.59.53207: 63162 NXDomain* > 0/1/0 (128) (DF) > 16:13:05.215790 192.168.0.59.64633 > 192.168.0.1.53: 61059+ PTR? > db._dns-sd._udp.0.0.168.192.in-addr.arpa. (58) [tos 0x18] > 16:13:05.216469 192.168.0.1.53 > 192.168.0.59.64633: 61059 NXDomain* > 0/1/0 (129) (DF) > 16:13:05.226242 192.168.0.59.61635 > 192.168.0.1.53: 6749+ PTR? > r._dns-sd._udp.0.0.168.192.in-addr.arpa. (57) [tos 0x18] > 16:13:05.226789 192.168.0.1.53 > 192.168.0.59.61635: 6749 NXDomain* 0/1/0 > (128) (DF) > 16:13:05.237319 192.168.0.59.56300 > 192.168.0.1.53: 21450+ PTR? > dr._dns-sd._udp.0.0.168.192.in-addr.arpa. (58) [tos 0x18] > 16:13:05.237842 192.168.0.1.53 > 192.168.0.59.56300: 21450 NXDomain* > 0/1/0 (129) (DF) > 16:13:05.248440 192.168.0.59.60806 > 192.168.0.1.53: 10032+ PTR? > lb._dns-sd._udp.0.0.168.192.in-addr.arpa. (58) [tos 0x18] > 16:13:05.249252 192.168.0.1.53 > 192.168.0.59.60806: 10032 NXDomain* > 0/1/0 (129) (DF) > > What exactly are these hoping to discover, and what needs turning off in > the Mac's setup (OSX, most likely a recent version) to quell them? > [snip] Probably Avahi and/or Apple's Bonjour service. These are also known as "ZeroConf" services. -Mike
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