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SBS2011 DCHP Question

Greetings,

Just installed SBS 2011 and i am having a few issues. The Wizard had me turn off DHCP on my router which i did. Where the issue comes is clients that are connecting to the network are not receiving ip addresses. I checked to see that the DHCP server is running and it is . Is there a step that is missing ? Thanks
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cbd1012
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cbd1012
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1 Solution
 
jon1966Commented:
You might need to add dhcp helper to the firewall interface (the workstations default gateway) that points to the DHCP server.
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cbd1012Author Commented:
Hi John thanks for the reply ! what exactly is that and how to i accomplish this
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cbd1012Author Commented:
ahh i c i checked a box in my router that says dhcp relay read that in another article but that is still not helping .. is there some other things on the sbs side that i need to do ?
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jon1966Commented:
Do you have multiple VLAN's or a single network?
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Rob WilliamsCommented:
A DHCP helper is usually used when routing DHCP requests from another network segment such as a remote office. It should not be necessary here.

DHCP needs to be off on the router and enabled and configured on the SBS. You mention it is on, but have you configured it? This is done on SBS by running the connect to the Internet wizard located on the Windows SBS 2011 console under Network | connectivity | menu on the right. Once complete I would recommend running the "Configure your Internet address wizard" as well, however that is not necessary for DHCP. Then on the PC's make sure they are sett to obtain an IP via DHCP and then from a command line on the PC's run:
IPconfig /release
IPconfig /renew
also good to run
IPconfig /flushdns
If they still cannot connect, as a test try, if possible, disabling all software firewalls on server and client including Windows firewall and 3rd party security suites.
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Plug a laptop into the router with all other LAN ports empty. Does the laptop get an IP address from the router?

I have seen some devices saying that DHCP is off but they are still delivering IPs. This causes DHCP on SBS to turn itself off.

Factory reset the router and configure it via that laptop before plugging it back into the SBS Switch.

Philip
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cbd1012Author Commented:
Hi Guys,

I needed to enable dchp relay on my router and make sure my dhcp server on the router was shut off , everything is working now
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Rob WilliamsCommented:
Interesting that you would need a relay. I assume the SBS is on the same network segment (subnet) as the router's LAN interface? What model router is it? It would be good to know for future.
Thanks for posting your findings.
--Rob
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