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06-23-2010, 12:46 PM
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#1 |
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Hall of Famer
Join Date: Apr 2002
Posts: 3,315
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/etc/resolv.conf changed in Snow Leopard?
The contents of /etc/resolv.conf (or rather the target file /var/run/resolv.conf) seems to have some commentary now in Snow Leopard (which wasn't present in 10.5.x):
Code:
$ vis /var/run/resolv.conf # # Mac OS X Notice # # This file is not used by the host name and address resolution # or the DNS query routing mechanisms used by most processes on # this Mac OS X system. # # This file is automatically generated. # domain myipprovider.net nameserver 123.45.67.89 nameserver 123.45.67.90 Is there a newer method (or an old one unbeknownst to me) to discover our DNS servers on 10.6.x client? I also ask this because i've found a thread where the symlink /etc/resolv.conf has been replaced by an actual file. Isn't that possibly a cause for alarm... or is this the new norm? Last edited by Hal Itosis; 06-23-2010 at 12:50 PM. |
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06-23-2010, 01:14 PM
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#2 |
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League Commissioner
Join Date: Mar 2003
Location: Kansas City
Posts: 11,347
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I believe a lot of the DNS resolution in 10.6 actually goes through the mDNSresponder daemon now, which is used for network discovery and bonjour. I think this was due to a lot of issues where you would be inside your own internal network with your own DNS and then say VPN into another private network with their own Independent DNS and the system having issues resolving DNS because it was not doing proper reverse look ups to the right servers....
Where as in 10.5 lookupd and Directory Services did a lot of the DNS resolution. nslookup and changeip (changeip is for server only) were also used. I also think that is why that file may be generated on the fly at times when you need access to a different DNS service say via VPN connection? I am kind of guessing here based on what I have read on the SL changes from Leopard. It seems the concept is, if a server doesn't respond knock it to the bottom of the list for performance and efficiency. That is why that file is generated on the fly I think, that and issues of being part of multiple networks at once say via VPN. http://support.apple.com/kb/HT4030 Above is a bit saying 10.6.3 modified DNS queries even a bit more, and they mention bonjour, which is what mDNSResponder daemon controls. Other than that, I have not much clue outside of what I posted. Still learning 10.6 myself and finally have a 10.6 machine on my desk to play with
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06-23-2010, 01:32 PM
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#3 |
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Hall of Famer
Join Date: Feb 2003
Location: Brighton, UK
Posts: 3,832
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It is all somewhat curious for me too, i would like to know what is going on ;-)
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06-23-2010, 01:49 PM
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#4 |
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Moderator
Join Date: Jun 2003
Location: Boulder, CO USA
Posts: 19,559
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There's a pretty good forum discussion of DNS in Snow Leopard at the link below:
Snow Leopard DNS & Directory Services Trevor
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How to ask questions the smart way |
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06-23-2010, 01:53 PM
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#5 | |||||||||||||||||||||||
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League Commissioner
Join Date: Mar 2003
Location: Kansas City
Posts: 11,347
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Nice, on a side note in that thread is a great link, here: http://support.apple.com/kb/HT3789 Which goes over mDNSResponder daemon a bit
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sudo make me a sammich http://www.tlarkin.com "It just told me what I already knew, that I'm a great and amazing guy, didn't I tell you baby, I'm Zaphod Beeblebrox." |
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06-23-2010, 10:05 PM
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#6 |
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Hall of Famer
Join Date: Apr 2002
Posts: 3,315
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Thanks for all the replies folks.
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