DNS issues

Lately i seem to be having getting to websites from my network.

Websites take a long time to load, sometimes they time out and i have to try to ping them a few times before i get a response.

I think it may be a DNS issue. i have a fortigate 110C firewall and a server 2008 running my dns server. what can i check?
datatechdcAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

WayneATaylorCommented:
If you are using the server as your DNS Server I would say that the server is taking time to resolve DNS queries.

It might be that there are entries in the Forwarder entries withing the DNS server that are wrong and each one will have to timeout before finding a good one.  The forwarders are always used first before the server will fall back to the root name servers.

Wayne


0
datatechdcAuthor Commented:
i am not familiar with dns servers, i have server 2008 how can i check the forwarders?
0
WayneATaylorCommented:
Have a look at

http://technet.microsoft.com/en-us/library/cc754941.aspx

This explains how to set forwarders.

Wayne
0
10 Tips to Protect Your Business from Ransomware

Did you know that ransomware is the most widespread, destructive malware in the world today? It accounts for 39% of all security breaches, with ransomware gangsters projected to make $11.5B in profits from online extortion by 2019.

datatechdcAuthor Commented:
i have the attached DNS configuration.
dns1.png
0
WayneATaylorCommented:
I've never used opendns so not sure if they work or how good they are, but you could write down what they are set to, and remove the entries (leaving the use root servers bit ticked)
Restart the DNS service and see if that is any better.

If I use forwarders I would normally use an upstream server from the ISP provider or none at all, so be interesting if that works better.  Worth making sure you have a full windows updates applied as every so often there are Root server updates applied to Windows bu windows updates.

Wayne


0
xcomiiiCommented:
If you use forwarders, use your ISP DNS servers, as they will be much faster than some other open DNS servers.

The most interesting in my mind, would be what are the NIC settings for your internal DNS server? Can you post ipconfig /all ?
0
datatechdcAuthor Commented:
ipconfig /all on my DNS server shows the following:

ipv4: 192.168.10.15
subnet: 255.255.255.0
gateway: 192.168.10.250 (this is the layer 3 switch)

dns: 192.168.10.15
dns2: 192.168.10.25
0
WayneATaylorCommented:
I'd say remove the forwarders first.

But what is on 192.168.10.25?

If that is not a valid DNS server it will have to wait for that to time out?

Wayne

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
WayneATaylorCommented:
But as said before, also worth making sure all windows udpates are done as that will also update all of the Root DNS Servers.

Wayne

0
datatechdcAuthor Commented:
updates are done.

25 is second dns server and mail server
0
WayneATaylorCommented:
Have you removed the forwarders and then restarted the DNS server?

Wayne

0
WayneATaylorCommented:
Also check the second DNS server for its settings, forwarders etc

Wayne
0
datatechdcAuthor Commented:
when i install the DNS feature in a new server 2008, is it already auto configured to work properly or do i need to go into the DNS manager and do something?
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Storage Software

From novice to tech pro — start learning today.