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How to serve VLAN with multiple subnets via DHCP

Simon Duffy
Occasional Visitor

How to serve VLAN with multiple subnets via DHCP

Hi

Can anyone advise on whether, or not, this configuration is possible and if so how to do it. We'd like to be able to feed one vlan with two different IP subnets using DHCP. The DHCP server is on a seperate VLAN.

Thanks in advance

Simon.
4 REPLIES
Mohammed Faiz
Honored Contributor

Re: How to serve VLAN with multiple subnets via DHCP

Hi,

I _think_ it would work but it wouldn't be pretty!
You'd have two IPs assigned on that VLAN for the two gateways and you'd have just one helper address for the VLAN.
Simon Duffy
Occasional Visitor

Re: How to serve VLAN with multiple subnets via DHCP

Thanks for your rapid reply but I could with more specific advice. We are happy with setting up the VLANs, IP subnets and adding a IP/UDP helper, but I'm particularly interested in getting the two IP subnets (on one VLAN) to be serviced by a DHCP located on a seperate VLAN.

Thanks

Simon.
cenk sasmaztin
Honored Contributor

Re: How to serve VLAN with multiple subnets via DHCP

Pieter 't Hart
Honored Contributor

Re: How to serve VLAN with multiple subnets via DHCP

you want to use multiple ip-subnets on the same (v)lan?
it's called "multinetting".

Long time ago this situation was commonly used, it's only in the DHCP-configuration.

you need to configure two scopes on the dhcp-server, and then create a "superscope" that contains both scopes.

http://technet.microsoft.com/en-us/library/cc757614(WS.10).aspx
Support DHCP clients on a single physical network segment (such as a single Ethernet LAN segment) where multiple logical IP networks are used.