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This question may have been covered before, but it is rather complex and haven't found a similar post, so please be kind!

I think my issue is rather unique, so I'll try to explain as best I can.

I'm currently configuring a domain at home for my new lab setup. I want my network setup as such,

My network is a 192.168.0.0/23 with all clients sporting the 255.255.254.0 subnet mask.

192.168.0.0/24 for servers. - DHCP handing out addresses.

192.168.1.0/24 for clients. - DHCP handing out addresses.

I believe that it's possible for the DHCP Server to distinguish the difference between the two types of clients with a DHCP Client ID. I want the servers to use a select ID without the need for clients to use one.

If you believe this isn't possible, but do know of any software / OS that may support this kind of setup please advice me. I'm not holding out much hope here, I'd just love to see if anyone has any suggestions.

  • To clarify: are you using a single network or two ones? If the latter, you will need a router configured for DHCP relay and two DHCP scopes on the server (which will be connected to only one of the networks). Otherwise, your description is wrong: if you only have one network, all computers will use a /23 subnet mask, regardless of having 0 or 1 in the third octet. – Massimo Nov 24 '15 at 18:35

1 Answers1

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Passing out DHCP leases based on more than just the client MAC address is very common. The best examples of how this is done are in the dhcpd.conf file that DRBL configures. An example from the DRBL FAQ:

class "DRBL-Client" { 
match if 
(substring(option vendor-class-identifier, 0, 9) = "PXEClient") or 
(substring(option vendor-class-identifier, 0, 9) = "Etherboot") or 
(substring(option vendor-class-identifier, 0, 10) = "DRBLClient"); 
}

Note the DHCP codes and then enter those examples to setup windows. However, based on experience of Windows losing reservations, i would use dhcpd on Linux or an equivalent BSD. Windows DHCP is not easier to configure as it small sized dialogs to configure a long laundry list of options. Searching for a hostname, IP address, MAC, or other client identification does not exist in Windows, but easy to search the dhcpd.conf text file. If you are stuck with Windows DHCP, then you have to use powershell to try to keep sane.

rjt
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