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Slow internet after migration

I have just installed a new windows 2008 server and migrated a small peer to peer network of 5 workstations running windows 7 enterprise. The server is attached to a router and the rest of the network using a gigabit switch. I have run dcpromo on the server and set up the dhcp server. The server has a set ip of 192.168.1.20 The ip scope has been set as 192.168.1.20 -  254. The router Dhcp is set to start from 192.168.1.100 so this range has been reserved on the Dhcp server to avoid conflicts. The gateway is set as the router address 192.168.1.1 and the dns on the server and the workstations is set to the server IP.
Since implementing this, the internet has slowed considerably - any ideas on how to fix this please?
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dobby69
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dobby69
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John HurstBusiness Consultant (Owner)Commented:
How fast is Internet on the Server with no Workstations attached?  That is, is this a server problem?

Why did you use 192.168.1.x?  I suggest changing it right away to 192.168.74.x or some such to avoid later conflicts. That is not likely your speed issue however.

Did you set your Workstations to DHCP, automatic DNS and not alternate?  Old settings may be causing issues.  

On one workstation, reset TCP/IP to see if that helps.
Open cmd.exe with Run as Administrator:  netsh int ip reset c:\resetlog.txt

After changing the IP range, restart the server just in case you have changed something along the way that a restart will benefit.

..... Thinkpads_User
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Rob WilliamsCommented:
It sounds like you have DHCP enabled on the router and the server.  It should be disabled on the router, and although you said it is, and Thinkpads_User posetd a reminder, it is critical the workstations point ONLY to the current server for DNS.  There should be no alternate and the server should also point only to itself.
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dobby69Author Commented:
Thanks for responding so fast.

All the workstations are set to automatic DCHP and are being assigned addresses by the server as per the server ip scope. The primary DNS on each is set as the server ip address and the secondary dns is blank.

The reason I kept to the range 192.168.1.x is that it is the range used by the router. I have set the DC server to use 192.168.1.21 to 192.168.1.99 and the router is assigning addresses from 192.168.1.100 to 192.168.1.254.

I shall follow your suggestions and see what happens. If you have any other thoughts I would be most grateful. Thank you.
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Hypercat (Deb)Commented:
Turn off DHCP on the router completely if possible. SBS does not like other DHCP servers on its subnet.  If the reason you have DHCP active on the router has to do with wireless connections, you still don't need to run DHCP on the router.  As long as the router is on the same subnet as the SBS server, as you've described, any wireless devices connecting to the router will be able to "see" the SBS server and will get a DHCP address from it.
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John HurstBusiness Consultant (Owner)Commented:
By trying the Server by itself you can divide the problem in half (a) Server, router and (b) workstation.

I suggested earlier restarting the Server. Further, if you make changes to the router, restart it.

Your server should dish out DHCP and not the router, so there is no need to stick to the router range of IP addresses.

... Thinkpads_User
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Rob WilliamsCommented:
You may find the DHCP service on the server is disabled.  Some versions of windows server will automatically turn off the DHCP service if there is a second DHCP server on the network.
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dobby69Author Commented:
Thank you all for your help, I shall turn off the router dhcp and remove the scope restrictions. Hopefully after restarting the server it will cure the internet lag. Again thank you all
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John HurstBusiness Consultant (Owner)Commented:
@dobby69 - Thanks for the follow up and I was happy to help.

.... Thinkpads_User
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