Macs lose connectivity to Windows based DNS

Posted on 2011-09-14
Last Modified: 2015-04-02
We have two internal Windows servers acting as DNS servers. Both are AD domain controllers, the primary being a 2008 box and the secondary being 2003. When users attach to our network via DHCP the get both server IP addresss as their DNS.
We have been running some Macbooks using Bootcamp, and there is never a problem when they are on the Windows side. What we have seen though is that when logged into the Apple OS side, the Macbooks will lose connectivity to both DNS servers within 5 to 10 minuters. Renewing the DHCP lease will restore the connection but it doesn't last. Its very strange because they don't lose connection to the network - I can ping other IP addresses, but not those of the DNS servers. Any thoughts would be appreciated.
Question by:86kubicki
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LVL 11

Expert Comment

ID: 36537769

Have you tried to use a static IP address (include your DNS servers information) instead of using DHCP (dynamic) ip address?

Author Comment

ID: 36537793
Yes I have tried to bypass DHCP entirely and manually add the DNS addresses, but I still ending losing connectivity with the DNS servers.
LVL 11

Expert Comment

ID: 36538113
How about using a LMhost file or equivalent?
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Author Comment

ID: 36538375
I've added our external DNS servers to the Mac's DNS list and that does work, but I'm more interested in what is causing the connectivity issue rather than a workaround.

Author Comment

ID: 36569257
I forgot to add some important info to the original question. This problem only occurs when using the Mac's wireless and only when using WPA security. This problem doesn't occur when using WEP security.

Accepted Solution

86kubicki earned 0 total points
ID: 37554786
We finally had to get a tech from Apple Canada to look at our problem. Turns out that the Mac's internal DHCP TTL setting needed to be increase to 128. Once we did this they stayed connected to our DNS servers via WPA.
Please consider this question closed.

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