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Internet slowness issue

Posted on 2011-09-27
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Last Modified: 2012-06-27
Here is our setup:

Remote office ---VPN--> Servers in a data center.

Domain is Server 2008, and DNS/DC's are server 2008.

The remote office has a domain controller / DNS server, then there are 2 DNS/domain controllers in the data center.

The issue is that internet load times are slow for users in the remote office. They are configured to use the DC/DNS server in the office as their primary, then the secondary is the DC/DNS in the data center.

DNS forwarders on the DC/DNS in the office is set to the local ISP's DNS servers.

Page load times are quite slow. Google can take 10 second to fully open when it normally just takes a second.

I believe the issue is related to DNS, but am not sure where else I need to look.

I set my laptop's DNS to the ISP's servers and bypassed the local DNS servers and everything seemed to load quite a bit quicker.

Does anyone know any other spots I can look at to troubleshoot this issue?

Not seeing any errors in the DNS event logs.

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Question by:themightydude
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by:carlmd
ID: 36709707
Is this a new problem, where it worked ok before? If so try stopping and restarting the dns servers (not refresh). Does that fix it?

If this has never worked ok, then go to a command prompt and do an nslookup of google.com. Check the lines for server and address and make sure it is using the one you think it should be. If that is ok then load the page using the ip address (http://w.x.y.z) to see if it's speed is ok.

What do you get?
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by:Darius Ghassem
ID: 36709726
Run dcdiag /test:dns

Could be that the local DNS server at remote office is having issues contacting the ISP DNS servers. You could forward all external requests to your HQ DNS server which should speed up some requests
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by:akhalighi
ID: 36709731
it looks like that you are using your ISP DNS server as your primary forwarder in remote office server . login to DNS server it self and try a nslookup to google , how is the performance on the server itself ?

use nslookup and connect to each DNS server i your forwarder list , see which one is quicker and which one is slower.

when this issue started ? just recently or from day one ?
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Expert Comment

by:BTS-techie
ID: 36710115
if ALL IP traffic from your remote site travels across your VPN to the central office and then out to the internet, then that would be the cause for slower internet traffic in the remote site.

You can consider allowing internet 'break-out' in your remote site and only 'force' your internal network traffic over your VPN.
If you do implement this in your remote site, be aware that proxy/firewall/web filtering needs to be provided as you would in you central office, alternatively you can have a downstream proxy in the remote site, pre-caching some frequently used web sites - this could ease some of the delays but not all.
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themightydude earned 0 total points
ID: 36950758
Sorry for the late response here, but the issue ended up being there was an old connection that use to be in that sonicwall and for some reason, the CFS service was trying to go out that connection, but failed so it made CFS unavailable, which in turn, slowed down internet browsing.

We turned on CFS failover and that fixed the issue.
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by:themightydude
ID: 36975446
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