Web browser very slow at times....DNS?

I have some users on macs that are complaining or slow web browsing at times when their dns is pointed to our windows 2008 dns server. They see it on wireless and wired connection. I had one of them point to a unix dns server and all is fine.

So how can I figure out what is wrong with the windows dns that the macs users see this slowness at times.
rdefinoAsked:
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JohnBusiness Consultant (Owner)Commented:
See if your default DNS is current. Sometime DNS servers get old and are not always working. You probably need to talk to your ISP is that is the source of external DNS to you.

Make 4.2.2.2 or like DNS your main alternate.
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rdefinoAuthor Commented:
This dns server is internal to my company. It's a windows dns server and all the windows systems using it are fine. Just some macs so this slowness from time to time. Could this a mac issue more than a windows dns server issue?
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JohnBusiness Consultant (Owner)Commented:
If only MAC machines are slow and all Windows machines are OK, then it must be some setting on the MAC that relates to their server connection.
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rdefinoAuthor Commented:
How can I trace this issue out, since it only happens from time to time?
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JohnBusiness Consultant (Owner)Commented:
I am not a MAC expert.

If I were using Windows, I would probably start with a packet sniffer like CommView to see what packets were doing.

You might try transferring a large file from an external source and see if the MAC network status tells you whether packets are always slow or fast/slow, fast/slow.
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