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:
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WayneATaylorConnect With a Mentor Commented:
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

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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


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

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

This explains how to set forwarders.

Wayne
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datatechdcAuthor Commented:
i have the attached DNS configuration.
dns1.png
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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


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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 ?
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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
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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

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datatechdcAuthor Commented:
updates are done.

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

Wayne

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

Wayne
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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?
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