Date: Sun, 1 Mar 2009 02:12:57 +1100 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: George Davidovich <freebsd@optimis.net> Cc: freebsd-questions@freebsd.org Subject: Re: Odd DNS requests Message-ID: <20090301015437.Q71460@sola.nimnet.asn.au> In-Reply-To: <20090228105413.GB32023@marvin.optimis.net> References: <20090228161606.N71460@sola.nimnet.asn.au> <20090228105413.GB32023@marvin.optimis.net>
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On Sat, 28 Feb 2009, George Davidovich wrote: > On Sat, Feb 28, 2009 at 04:32:47PM +1100, Ian Smith wrote: > > 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? > > DNS-Based Service Discovery: > <http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt>; > > Skip to the section titled: > > 12. Discovery of Browsing and Registration Domains (Domain > Enumeration)' > > when it gets boring. There may be something more recent or more > authoritative, but that's what I have bookmarked. Thankyou George. Not tonight's bedtime reading but I'll get through it. > As for configuring the notebook, etc., perhaps someone else can chime > in. On the face of it, it seems not a bad idea. I'm not averse to using DNS in ways that some may consider impure, being more bothered by things I don't understand :) I'll check the Mac's mDNS setup though, there's no sense it banging away forever on NXDOMAIN responses, that often anyway. cheers, Ian
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