DHCP Relay Agents

I understand that I need to enable a DHCP relay agent on my routers for my
single DHCP server to beable to serve other subnets. My question is this:
how do clients on the remote subnets get an ip address from the correct
scope? How does the client/agent/server know what a valid address on that
subnet is? I'm just trying to understand how this works?

Hi Ryan,

The DHCP relay agent fills out the "giaddr" field in the DHCPdiscover packet
with the router's address on the client subnet. When the DHCP server
recieves the discover it uses the giaddr field to determine the correct
scope. See 120932 DHCP: Spanning Multiple Subnets
http://support.microsoft.com/?id=120932

Thanks,
Marc Reynolds
Microsoft Technical Support

This posting is provided "AS IS" with no warranties, and confers no rights.


"Ryan Stevens" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> I understand that I need to enable a DHCP relay agent on my routers for my
> single DHCP server to beable to serve other subnets. My question is this:
> how do clients on the remote subnets get an ip address from the correct
> scope? How does the client/agent/server know what a valid address on that
> subnet is? I'm just trying to understand how this works?
>
>