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Disable DNS Root hints

Posted on 2005-03-30
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Last Modified: 2010-05-18
I have been noticing some odd traffic in my network. it appears that my two microsoft DNS servers keep trying to get to the internet to update their root hints list. I have manually removed the list of root hints, and replaced it with a reference to my primary DNS server, which is a linus firewall.

The MS DNS servers are prevented from updating the root hints by an ACL, but i was wondering if there was any way to prevent them from TRYING to go to the internet to update this.
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Question by:athelu
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Expert Comment

by:Sembee
ID: 13665559
They will usually stop if you configure forwarders.
Otherwise this is by design.

Simon.
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Author Comment

by:athelu
ID: 13665928
I had configured forwarders, and had removed the default root hints and replaced with a reference to my Master DNS server. According to microsoft, the servers should only try to update the root hints if NO root hints are available.

i did however find mention that if the CACHE.dns file contains entries not listed in the root hints, that on startup the sytem will add them.

i have now modified my cache.dns file to only reflect my master DNS server. I am waiting to see if this fixes the issue.
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by:athelu
ID: 13909494
I ended up deleting the cache.dns file and am no longer encountering this issue. Thanks for your comments Sembee.
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