I've been looking into subnetting our network and I seem to be stuck, at least conceptually. I would prefer to just assign IP/mask based on MAC address with wildcard so I can easily just put a set of computer models in each net and route between them. There isn't any real need to segment them based on physical location since there are quite a few that are mobile and would walk between different networks, most likely. I'm just doing this to cut down on network noise as that has become a problem with 500+ devices in one broadcast domain, OMG! I've looked into ways to do this with VLAN and ip-helper/relay stuff but I really don't need them on a VLAN, just a different broadcast domain. I've dug around in the 2012 DHCP server documentation and from what I've seen there are Policy options but looks like it is only for setting DCHP options for those fitting in those policies. I would need to be able to have it assign scope with IP/mask based on MAC and preferably using wildcards, similar to filters or policies.
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Is there a way to do this using Windows 2012 DHCP server or would I need to start looking for a different DHCP service provider? Edited May 20, 2015 at 16:27 UTC. The general concept would be to come up with some VLANs, say 10,20,30,40 then configure switch ports with VLANs as you wish to segment. Connections between switches will need to be trunk ports allowing all VLANs and a trunk port to your firewall/router to allow routing between VLANs. If you have a layer3 switch you may also allow routing there. Then on the switches configure dhcp relay for each VLAN to point back to your existing DHCP server which you will configure to have a scope for each VLAN like 10.10.10.0/24, 10.10.20.0/24, etc. The general concept would be to come up with some VLANs, say 10,20,30,40 then configure switch ports with VLANs as you wish to segment.
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Connections between switches will need to be trunk ports allowing all VLANs and a trunk port to your firewall/router to allow routing between VLANs. If you have a layer3 switch you may also allow routing there. Then on the switches configure dhcp relay for each VLAN to point back to your existing DHCP server which you will configure to have a scope for each VLAN like 10.10.10.0/24, 10.10.20.0/24, etc. Well, believe it or not, I might have figured out a completely ridiculous way to do this anyway. I'm still going the VLAN route but if anyone is curious. This might work:.
Make a DHCP Super-Scope!. Sub-Scope for each subnet. Reserve IP-MAC for each computer/device (no wildcards here) into appropriate Sub-Scopes Can be scripted, though, using.
Setup Secondary IPs in router for each subnet gateway under VLAN1 (or whatever). Might need some ip-helper and smart-relay stuff in router as well. Like I said, I'm not going to do it. But I reeeeeeeeally thought about it.:-).