Question : Windows 2008 slow DNS server

Hi Folks,

 Windows SBS2008 FE server
Some windows XP workstations

Users complain about slow browsing.  Throughput on ADSL line tested OK.
Tried various DNS forwarder configuration, ISP/OpenDNS/None - same slow results

Tried this util on server:  (DNS Perf Test - http://swmirror.org/drupal/node/93),

Average result ~ 1000ms, Low ~ 730ms, high ~1200ms
Terrible!

Then try from a workstation (DNS to set to SBSserver)

Average result ~ 275ms, Low ~ 0ms, high ~1000ms
OK!!


Uh?  The workstation results are ok, but testing from the server is horrible?
I tried the util on several other servers and results are fine.

Do I have a Windows DNS server issue?  Are there better ways to test?  

ipconfig outputs attached (I just know you'll ask)

Attachments:

server.txt (872 bytes) (File Type Details) 

Server IPCONFIG

wrkstation.txt (1 KB) (File Type Details) 

Workstation IPCONFIG

Answer : Windows 2008 slow DNS server

It seems the delay was caused by the wrong Node Types for both your workstation and server.

Since all workstations are in your domain, and are intended to use your DNS (AD/DHCP) server for resolving host names. Therefore, the workstations should NOT have Broadcast node type, which means the workstation unnecessarily use broadcast to resolve computer names to IP addresses. The similar problem is for the server, too.

To fix this problem, you need to modify DHCP Options 46 on your DHCP server, changed its value from 1 to 2 or 8.

FYI

Managing WINS and NetBIOS Over TCP/IP
http://technet.microsoft.com/en-us/library/cc722535.aspx

Managing DHCP Options
http://technet.microsoft.com/en-us/library/cc958929.aspx

Good luck