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Internet Resolution slow on SBS 2011 network

The client PC's on our small business network are experiencing very slow internet resolution speeds on a wide range of web addresses.  The clients are Windows 7 & XP running on new and older PC's and laptops.  To give a background on our network, I have an ISP 6up & 6down connection into our Fortinet Fortigate 60c Firewall\Router which in turn connects to a Netgear JGS524e switch.  I have SBS 2011 Standard running on a Dell T710 server and it is connected to the switch.  DHCP is allocated to the 6 client machines via SBS server using MAC address reservations. (This is just done out of habit at this small business.)  The firmware on the router and switch are up to date.  Each client machine uses SBS server for DNS and I have our ISP's DNS server setup as forwarders in DNS manager.  I also flush the DNS cache on the server on a daily basis and randomly on the client.

The problem we are experiencing is internet sites can take 10-60 seconds to load and this occurs on a daily basis.  I have spoken to the ISP and they sent out engineers who checked the connection and said everything is fine.  When I do speed test at www.speedtest.net I can get results anywhere from 0.5 down & up - 6 down & 6 up however this changes all the time and can greatly change from machine to machine and hour to hour.

I this stage I need guidance as to what else could be causing this problem.

Many thanks
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TheMurman
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TheMurman
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1 Solution
 
Cris HannaCommented:
First recommendation would be to download and run the SBS Best Practice Advisor and fix everything it finds, regardless if you think it's appropriate

Have you run the "Connect to the Internet Wizard"?

Can you run and post the results of "ipconfig /all" from both server and workstation.  Be sure to identify which is which.
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TheMurmanAuthor Commented:
Good morning CrisHanna_MVP, thank you for responding to me.  I have attached the ipconfig settings for an XP & Win 7 workstation and for the server.  I have also run the Connect to the Internet Wizard, the Fix my network wizard and the SBS Best Practice Analyser.  I have fixed most things the analyser suggested accept upgrading the Exchange Server 2010 to SP2 as I am still using some XP client and a prerequisite of SP2 is that all pc's be windows 7.  I have also not updated the Sharepoint database as we don't specifically use sharepoint.  Lastly gave an error about Journal wrap.  I have included a screen shot of the analyser errors on the attached file.  Thank you
IPConfig-Settings.docx
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Cris HannaCommented:
How many nics in the server?   I see the connection setup on the server as connection #3

Have you enabled DNS Forwarders on the server?
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TheMurmanAuthor Commented:
The server has four inbuilt NIC's and we are currently using no.3. As for the forwarders, I have our ISP's two DNS servers configured as forwarders in DNS managers. I have to use these two DNS servers due to the sensitive data are content analysts work on. This is a legal requirement
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Cris HannaCommented:
Are the 3 other nics DISABLED?

Everything else looks fine...

You should fix the journal wrap issue...it's not affecting your name resolution...but will bite you in other circumstances

How much RAM in the server?    Are you running any other apps from the server? (i.e. SQL, etc)

You could also try swapping out for a different router.   Are your ISP DNS servers in the router config as well?
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TheMurmanAuthor Commented:
Yes the 3 other NIC's are disabled and there is 16GB of Ram. The server is used for Exchange and other than that just file & print services.  As it happens I added the ISP's DNS server to the router yesterday but it hasn't made a difference
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Cris HannaCommented:
There are any number of variables here.   I'd have to run perfmon to see if resources are an issue when trying to surf from a workstation.

You could run wireshark to see if something is slowing the networking.

If this were me, I'd probably stick a 40.00 netgrear router in place of the current one to see if there's any difference to rule out the router.
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