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Question
Wednesday, December 22, 2010 10:13 PM
Hey guys, I have a AD DNS server I am removing from my network. Problem is, I am not certain who all is using it. I opened DNS debug and set all options and logged one of my servers as using it. I removed the DNS from that server restarted dns servers, restarted netlogon and according to the logs it is still using it.
What are the debugging options to see only who is trying to use this server for dns? What services do i need to restart after i change the DNS client IP so it actually takes effect.
Some of these clients may be DNS forwarders, some of them may be NICs configured wiht the server as dns.
thanks!
All replies (3)
Wednesday, December 22, 2010 11:54 PM ✅Answered
For using the DNS server debug logging options, refer to this Microsoft article.
You can also use the wireshark utility.
For clients with NICs configured with the server as a DNS, you should just change the used DNS server by changing the IP addressing properties.
For the DNS forwarders, you just should make sure that they are not still forwarding DNS packets to this DNS server and also change the used DNS server by changing the IP addressing properties.
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Thursday, December 23, 2010 4:07 AM ✅Answered
In addition, check DHCP option 006 and remove this server's IP address. You'll want to also check the other DCs to make sure its IP is not configured in their IP properties. Do you have any devices, such as printers, routers, or Unix or Linux machines configured to use it, or possibly a Stub zone configured elsewhere?
Other than that if not sure, I agree with Mr X that it's a good idea to use Wireshark to watch any inbound queries on TCP 53 & UDP 53 to this server.
Ace
Ace Fekay
MVP, MCT, MCITP EA, MCTS Windows 2008 & Exchange 2007, MCSE & MCSA 2003/2000, MCSA Messaging 2003
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This posting is provided AS-IS with no warranties or guarantees and confers no rights.
Friday, December 24, 2010 5:55 AM ✅Answered
Hi,
You may also take look the old thread below who provides some good suggestions:
Thanks.
Tiger Li
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