Welcome to our community! Hi I am working on a network with HP Procurve switches. I have configured a route between the vlans on one of the switches, this is working fine. I have used the ip helper-address command but this does not seem to work. Thanks for your help. Join our community to see this answer!
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What it sounds like you don't want is a single big subnet with a bunch of bridges running proxy ARP, in my opinion. The DHCP server chooses the scope to choose an address based on either the network interface the request is received from if it's a broadcast request or the address of the DHCP relay agent if it's a relayed request.
Please provide a diagram and I will revise my answer to truly answer your question. Your explanation is a bit all over the place. You say you're going to have multiple vlans but in the same breath say that you're only going to have one subnet. Each VLAN by nature must be its own subnetwork or inter-vlan routing will not happen. DHCP helper is used to forward DHCP requests from hosts on one subnet to a DHCP server on another, the IP and subnet mask of the interface that forwards the request is what is used to determine which scope to select for address distribution.
So you see, you either need to make up your mind that you're truly going to have only one subnet, or you will continue to maintain multiple. Before I go any further, I think I need to clarify some keywords. A "scope" in Windows speak is effectively a subnet definition, and it can contain one or more address pools from which the server can assign addresses.
Since in your case there would only be one interface since everybody is on the same subnet , this means it would use the scopes quite randomly. That would then probably cause havoc with your VLANs. The way to avoid this is by using specific conditions to tell the DHCP server which scope to use for particular requests. If you put the sites on seperate vlans then they will not be able to communicate without routing so there would be no difference in having them on different subnets anyway.
Why do you want them all on one subnet? It seems to me that you are trying to use networking in a way that was not intended and causing yourself problems in the process.
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