Very Slow internet access via SBS2011 on 80MB connection

I have had an issue with a customer running a relatively fresh install of SBS 2011 with all updates. They are finding surfing the internet from local machines incredibly slow. We assumed that the internet speed was to blame as the business estate they are on is slow, however having in the last week updated them to 80MB business Fibre the situation has not improved.
I have checked the DNS on the server. When changing Forwarders it seem to take an age to resolve and establish a connection. I have tried it on the suppliers DNS, Google and OpenDNS. If I run a simple and recursive query it Fails.
I have cleaned dns cache, purged dns and restarted. Still poor.

Any help would be much appreciated
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RicheyyyAsked:
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RicheyyyAuthor Commented:
Before it is asked this is not a migration so there is no rogue DNS Forward Lookup Zone entries and I have triple checked
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ktaczalaCommented:
Have you tried a standalone PC on the network with it's own DNS settings?  That would isolate the server from the problem.  If speed is still slow on standalone PC look at router.
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RicheyyyAuthor Commented:
I have not no but the server seems fine when surfing from it but only in fits and starts. The router is newish and the slowness was around prior to the change
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Change the edge device to something that can handle both the connection and required filtering. Sounds like the current edge is either dying or too small for the gig.

Philip
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RicheyyyAuthor Commented:
Draytek 2830, more than suitable for the task
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Swap it out with a known good unit.

Make sure the ports on the modem, Draytek, and whatever switch it is connected to are not jabbering.

A bad handshake may be the cause between the modem and the Draytek. Force 100Mb on one side or the other to see if the problem clears.
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RicheyyyAuthor Commented:
I will try it tonight/tomorrow and get back to you thank you
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Cris HannaCommented:
Have you tried running the Fix My Network Wizard from the SBS console to see what it might find?
The SBS BPA 1.5 is a great tool as well
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RicheyyyAuthor Commented:
I have established that it must be a DNS issue either on the server or the actual internet but no further at this point
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Do you have the ISP's DNS server IPs in the Forwarder's tab in DNS? If not you should.
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ktaczalaCommented:
So a standalone PC with separate DNS settings works fine?  Or still has issues?
Have you tried connecting directly to the ISP device to eliminate your LAN completely?
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RicheyyyAuthor Commented:
That is what I intend to do next, I am waiting for a suitable day when they are less busy and will post results
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