Dns is resolving a lot of website quickly, but there are some websites like cnn.com , bbc.com take around 15 second to resolve the host name , I used nslookup then ping cnn.com and bbc.com and then take time also . I have 2 dns , and I have 3 dns for isp and when I changed my dns and put any of isp dns I can open any website so fast, before all websites were opening fine but now I have that issue, and I check all configuration and connectivity all work great, OS Win server 2008 r2 and clients win 7 and xp.
>>I have 2 dns , and I have 3 dns for isp and when I changed my dns and put any of isp dns I can open any website so fast,
Based on your description, this can be caused by the high workload of the DNS server. We can try to split the workload of the DNS server by using other DNS servers.
check the workload of your DNS
how many users in your environment?http://technet.microsoft.com/en-us/library/cc778608(v=ws.10).aspx
Monitoring DNS server performance
Every second counts..make use of it. Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.
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