recently out corporate network had some speed problems. My guess is a DNS Problem, so I wrote a batch script which calls nslookup 1000 times on a client. About every 100th call fails with a timeout.
What are the possible reasons for this behavior?
I ran Wireshark on the Windows 2003 SB Server. I located the failing DNS call but I'm not able to interpret that. The failing DNS request has 4 Packets, the successfull has 6 Packets. Is there anything I could look for?
Here are the relevant packets in wireshark. Packets 2709 to 2712 belong to a failed request (timeout). Packets 2768 to 2773 belong to a successfull request. I used ping to distinguish between subsequent requests.