First, a little bit about what we're trying to do.
- We are migrating from being multiple LANs (multiple subnets) connected over slow VPN links to a single MAN (single subnet) connected with gigabit fiber
- We are going to VLAN each site to control cross-site "chatter"
- We have a single "datacenter" that will host the servers for all sites
- The networks will NOT be routed and, again, will be a single subnet
- Our switches support DHCP helper
- Our DHCP server is a Windows box running Server 2003, but may be upgraded to 2008
So, my question is this:
With DHCP helper on the switches forwarding DHCP requests, is the address that the DHCP server returns based off of subnet or scope?
So, for instance, if I configured multiple scopes like this:
- scope 1: 10.1.0.1 through 10.1.20.254
- scope 2: 10.2.0.1 through 10.2.20.254
and both of these scopes were in the same subnet (mask of 255.0.0.0), would the DHCP server hand out an IP to a machine from either scope at random because the subnet is the same, or would it hand out an IP from, say, scope 1 because the DHCP request was forwarded from a switch with an IP that falls within scope 1?
I've read conflicting information on this topic, some say scope while others say subnet (sometimes using them interchangeably in the same reply)
Any help would be appreciated.