On Tue, Jul 26, 2011 at 2:41 PM, Bill Humphries <[email protected]> wrote:
> client has mac with snow leopard that suddenly can't use DNS. i can use
> nslookup in terminal to successfully query a DNS server. but DNS lookups
> fail when using a browser or even ping. craziness.
I don't know how Apple might have jiggered things, but on a
traditional *nix system, nslookup has its own self-contained DNS
resolver implementation, separate from the system-wide resolver
regular programs use (like a browser or ping). So the fact that one
works and the other does not suggests the problem is in the local
system resolver configuration, not the network.
Does Mac OS X use /etc/nsswitch.conf? That's the traditional *nix
config file for the "name service switch", which determines how names
get resolved. Traditionally there would be a line such as:
hosts: files dns
which means, "to look-up a host (computer), first check files
(/etc/hosts), then try DNS". You might check there.
Does Mac OS X ship with Perl? If so, try this as a command line:
perl -e '($x) = gethostbyname(q(www.google.com)); print qq( ($x) ($!)
($?) ($^E) \n);'
When it works properly, it should print the canonical name, followed
by empty or zero values, each in parenthesis. When it goes wrong,
error information should show up.
-- Ben
~ Finally, powerful endpoint security that ISN'T a resource hog! ~
~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
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