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How make internal DNS server fast for name resolution

Posted on 2015-01-23
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Last Modified: 2015-01-31
Hello Expert,
our company have a windows 2008 32-bit Active directory environment, my internal DNS server is always working slow due to this loading websites are very slow. Please advice me the best practices to make a DNS server faster.

Regards
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Question by:smpvm
12 Comments
 
LVL 34

Expert Comment

by:Seth Simmons
ID: 40566410
slow loading of sites has nothing to do with dns; it only provides name resolution
what is your internet connection speed?
could be the site; could be your connection
AD is irrelevant here
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Author Comment

by:smpvm
ID: 40566434
I mean the name resolution time is longer than expected.
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LVL 32

Expert Comment

by:it_saige
ID: 40566513
How is your DNS server configured?
What are the Network Card settings?
Are you using DNS forwarders, if so what are they?
Do you have your Root hint records set properly?
How many *hops* are between your DNS server and the internet?
How much traffic is going to your DNS server, should you consider adding another DNS server?

-saige-
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LVL 24

Expert Comment

by:VB ITS
ID: 40566521
Check if your DNS server is using Forwarders: https://technet.microsoft.com/library/cc754941.aspx

If it's not using Forwarders then you can try using Google's DNS forwarders (8.8.8.8) as a test to see if it improves DNS resolution. If you have multiple DNS servers then you'll need to make this change on each server.
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Author Comment

by:smpvm
ID: 40566628
How is your DNS server configured?
Active Directory integrated zones.

What are the Network Card settings?
Preferred DNS server is ip of the same DNS server

Are you using DNS forwarders, if so what are they?
Yes, Forwarded to local ISP DNS server

Do you have your Root hint records set properly?
Use root hints if no forwarders are available is "Disabled"

How many *hops* are between your DNS server and the internet?
2 hops

How much traffic is going to your DNS server, should you consider adding another DNS server?
we have 600 computers in our company and their will be are 300 mobile devices.
I have 2 active directory integrated DNS in my company

Regards
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LVL 32

Expert Comment

by:it_saige
ID: 40566690
When you say "Preferred DNS server is ip of the same DNS server" is it the actual IP address, i.e. - 192.168.1.15; and not 127.0.0.1?
Do you have the Alternate DNS server set to your other DNS server(s)?Capture.JPGAlso is DNS bound to only the IPv4 address and not IPv6?Capture.JPG-saige-
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LVL 32

Expert Comment

by:it_saige
ID: 40566696
One other question, what Server options do you have selected?Capture.JPG-saige-
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Author Comment

by:smpvm
ID: 40566701
Yes my DNS is configured same as shown in the above screenshots.
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LVL 32

Expert Comment

by:it_saige
ID: 40566761
Have you cleared your DNS cache and scavenged stale records recently?  Try flushing the reregistering the NIC.
ipconfig /flushdns && ipconfig /registerdns

Open in new window


How do your network bindings look?
Is the network card configured to use half-duplex (shouldn't be but checking that and other settings, e.g. - TCP Offloading; won't hurt).

-saige-
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Accepted Solution

by:
smpvm earned 0 total points
ID: 40570611
I deleted and recreated all my DNS zones which solved my problem, so i am closing this ticket.
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Author Comment

by:smpvm
ID: 40570921
Ticket closed
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Author Closing Comment

by:smpvm
ID: 40581254
I solved the problem
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