Solved

How to confirm DNS is setup correctly?

Posted on 2014-12-22
9
97 Views
Last Modified: 2015-03-28
All of the sudden, our internet connection has become very slow and I think it has to do with our DNS configuration.   We have one domain 2008 R2 and very site is a DC controller used for file and print sharing.  In addition, we also have DHCP and DNS on each site.  How do I confirm that our DNS is setup correctly.   If I do a dns lookup, I am getting the following:

nslookup 127.0.0.1
DNS request timed out.
   time out was 2 seconds.

Server: Unknown
Address: ::1

Name: localhost
Address: 127.0.0.1

Is there a tool or command that I can run to assure all my DNS settings are right?

Thanks

Richie
0
Comment
Question by:rmartes
  • 4
  • 3
  • 2
9 Comments
 
LVL 2

Expert Comment

by:msidnam
ID: 40513213
Are you doing the nslookup on the server? If so, you may want to check your forwaders. You can check this by right clicking your DNS server inside the Server Manager under roles. When you do this, select properties and then select the forwarders tab.I use my ISP's DNs servers as forwarders.

Usually the way DNS works, is you should have one or more DC's as a DNs server. All your workstation should point to them using DHCP. Then those DNS servers should have forwarders that point to outside DNs servers to resolve outside names.
0
 
LVL 78

Expert Comment

by:David Johnson, CD, MVP
ID: 40513275
Please elaborate on 'internet is slow".  Have you checked your bandwidth utilization at the internet endpoint .. a machine on your network may be hogging the internet connection.

When did this first start to become an issue?  As a test you could only plug 1 computer into the internet endpoint and go to speedtest.net and verify your connection speed
0
 

Author Comment

by:rmartes
ID: 40513298
Sorry about that.  Our internet goes through our datacenter.   This became an issue about 2 weeks ago.    In short, I just need to confirm that my DNS settings are correct.  I will like to start in just one site and then take it from there.   I personally think it is a DNS issue on my end.  Again, every site as its own DNS/DHCP on DC and they all communicate with each other.  I have a DC NY, TAMPA, LA, SEATTLE, CHICAGO and so on.  They are all part of the same Domain
0
 
LVL 78

Expert Comment

by:David Johnson, CD, MVP
ID: 40513327
dns would mean that the site doesn't resolve.
i.e. nslookup google.com -- do you get a result? was the lookup reasonably speedy?
0
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 

Author Comment

by:rmartes
ID: 40513340
This is what I am getting, so something has to be wrong.

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\administrator.BNB>nslookup google.com
DNS request timed out.
    timeout was 2 seconds.
Server:  UnKnown
Address:  ::1

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out

C:\Users\administrator.BNB>
0
 
LVL 78

Expert Comment

by:David Johnson, CD, MVP
ID: 40513364
that confirms that your dns is pooched.   from the server go into dns and select monitoring and see if both items pass the test

while you are there check your forwarers
0
 

Author Comment

by:rmartes
ID: 40513382
ok - I'll need to download the DNS monitoring management pack on this DC controller and get back to you.  What specifically are you wanting me to check in the forwarders??
0
 
LVL 2

Accepted Solution

by:
msidnam earned 500 total points
ID: 40513495
Your forwarders will be another DNS server on the outside. As mentioned in my post above, I use my ISP's DNS servers. You could probably even use googles DNs servers. I think they are 8.8.8.8 and 4.4.4.4
0
 

Author Comment

by:rmartes
ID: 40513583
The forwarder was wrong, so I changed it as suggested and it is now doing a successful nslookup on google.com

C:\Users\administrator.BNB>nslookup google.com
Server:  UnKnown
Address:  ::1

Non-authoritative answer:
Name:    google.com
Addresses:  2607:f8b0:4004:803::1005
          173.194.121.5
          173.194.121.7
          173.194.121.0
          173.194.121.3
          173.194.121.14
          173.194.121.9
          173.194.121.6
          173.194.121.8
          173.194.121.4
          173.194.121.2
          173.194.121.1

I installed the DNS monitoring management pack on the server, but don't seem to see where to run it.
0

Featured Post

Optimizing Cloud Backup for Low Bandwidth

With cloud storage prices going down a growing number of SMBs start to use it for backup storage. Unfortunately, business data volume rarely fits the average Internet speed. This article provides an overview of main Internet speed challenges and reveals backup best practices.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

You might have come across a situation when you have Exchange 2013 server in two different sites (Production and DR). After adding the Database copy in ECP console it displays Database copy status unknown for the DR exchange server. Issue is strange…
Sometimes drives fill up and we don't know why.  If you don't understand the best way to use the tools available, you may end up being stumped as to why your drive says it's not full when you have no space left!  Here's how you can find out...
This tutorial will walk an individual through locating and launching the BEUtility application to properly change the service account username and\or password in situation where it may be necessary or where the password has been inadvertently change…
This tutorial will walk an individual through the steps necessary to enable the VMware\Hyper-V licensed feature of Backup Exec 2012. In addition, how to add a VMware server and configure a backup job. The first step is to acquire the necessary licen…

910 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now