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Internet is very slow; we have a static IP

Posted on 2011-10-14
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The internet is very slow.  It started about 24 hours ago.  We run Windows SBS 2003 on our server.  We have about 20 work stations running XP Pro.  The DSL line is a telephone line.  It comes in to the modem.  The modem is in bridge mode.  It connects to the Belkin router which also a wireless access point.  The router connects to the switch.  All the other computers connect to the switch.  We have a static IP address with our ISP.    I contacted our ISP and I don't think it's their problem.  It seems as though it might be a DNS problem.  The work stations point to the server for DNS.  The server's DNS is itself.  The default gateway is the router.  In the router configuration the DNS address is for a reputable DNS server, though I tried several others with no improvement.  If at a work station I bypass the server by pointing it directly to an outside DNS server, then the internet snaps to attention and works great.  (Of course we cannot do this in practice because the physical server is the email exchange server, it's the file server, it manages antivirus, etc.)  But this tells me that the problem is not with the ISP.  It seems to me like a DNS issue.  Could the router be faulty?  I rebooted the router and the server.  
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Question by:Josh Christie
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Expert Comment

by:brianmultilanguage
ID: 36971295
Your tests show the SBS server to be the problem as your test bypassed DNS in SBS. Start there. The DHCP settings in SBS.
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Expert Comment

by:penguinjas
ID: 36971438
Have you entered a DNS forwarder on your DNS server?  Open DNS on your SBS server and select the server.  Right-click and choose properties.  Select the DNS forwarder tab and enter the Upstream DNS server you want to use that is on the Internet.
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Accepted Solution

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penguinjas earned 2000 total points
ID: 36971453
Using a forwarder:  Your clients will contact the SBS DNS server for resolution.  Your SBS server will look at its forward lookup zone and when it doesn't see the domain you requested it will use the forwarder address to resolve the request.
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Author Comment

by:Josh Christie
ID: 36980223
This is a WOW solution.  

I've gotten quite a few good solutions to issues from Experts Exchange.  This one is about the quickest, simplest, and most dramatic.

As it turned out, the 2 DNS servers we had listed there were EarthLink's.  I had indeed heard that there were some EarthLink DNS servers that went down last week.
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Author Closing Comment

by:Josh Christie
ID: 36980231
Great solution.  Exactly what I needed.
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