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DHCP servicing multiple subnets

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1,366 Views
Last Modified: 2012-08-14
Hi

I need assistance with DHCP.
I have multiple subnets per building and want to have one dhcp server and want to give the client an ip address based on what subnet (or building) they coming from.
please let me know what additional information you need.
Thanks so much.
DHCP Server is Win2008 R2.
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SouljaSr.Net.Eng
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Top Expert 2011

Commented:
What type of network equipment are you using? Topology? Most likely you will need to use IP Helpers to relay broadcasted dhcp traffic.

Commented:
Have a look at this MS link with details of how to do this: http://technet.microsoft.com/en-us/library/cc771390.aspx

Author

Commented:
I know it has something to do with the IP Helper service but I have no knowledge of how it actually works.
Can some perhaps explain how a client , coming from a particular subnet or Vlan will get assigned a IP address from a particular scope?
and what is preventing the user from getting an ip address )from the same dhcp server) from another scope?

The default gateway is a Layer 3 switch (Cisco 3750 POE) WS-C3750-48P

What I really want to know is how the DHCP server distinguishes from which scope its going to assign the client an ip address from

Thanks guys
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Sr.Net.Eng
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Commented:
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Author

Commented:
Thanks to everyone. Its so much clearer now. We set it up and pointed the ip helper to the dhcp and setup to ports with different vlans.
plugged in 2 laptops and they both got different ips based on the vlan they coming from. swapped it around and it worked again :-) awesome stuff.

Is there some information in the packet that lets the dhcp server know or what? is the dhcp the intelligent 1 or does the ip helper do all the work?

but otherwise the concept is working. Thanks again
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Commented:
Interesting thread this one.  Can you supply any info about the commands required to setup the IP helper service ?
--IJ

Author

Commented:
Thanks to ALL the experts. Much appreciated.
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