Hello LarcenIII,
I think the fastest way is using a packet sniffer and snif only DNS traffic.
Another way should be to change DNS settings on computers one by one and one by day.
Regards.
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Question
Checking what computer on the LAN is performing a Specific DNS query.
I have a network with two Public IP's and two firewalls. I use OpenDNS as my forwarders. I can see that from site #1 I have 10,000 DNS requests a day for 5 AOL Servers. I'm guessing AIM is on the network.
All computers are joined to the domain, and I ran LAN Guard and did a software Audit. No copies of AOL AIM are anywhere to be found. So my question is, how can I see what IP address is making all these DNS requests?
Do I have to use a packet sniffer? Is there another easier way of doing this?
- OPENDNS-SCREENSHOT.jpg
- 73 KB
This many requests after just 2 hors into the workday!
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Answers
No need for a packet sniffer yet. Open the properties of the DNS server, go to the "Debug Logging" tab, enable "Log packets for debugging".
You only need to check
- Incoming
- UDP
- Queries/Transfers
- Requests
Set a log file on a disk with enough space, click "Apply".
Leave it running for a bit (a minute should be plenty ...), then disable logging again.
Open the log file, search for "aol(3)com(0)"; you'll find the client IP(s) in the same line(s).
Thanks so much oBdA!!!
I feel so stupid, I've done that before! It has been a few years, but I simply forgot how! I don't even use my Windows Server Administration guide anymore so I lost it along the way! I knew I didn't need to sniff the traffic!
I found the source too! But now I'm worried... it's coming from my Gateway! (Router) Why in the ^%$# would it be requesting all those addresses repeatedly?!
MANY THANKS to oBdA!!
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by: LarcenIIIPosted on 2009-11-04 at 08:11:23ID: 25740777
Each workstations DNS is set to my Windows 2003 DNS server.
The server forwards outbound queries to OpenDNS.