DHCPD discover on one subnet, offer another
We currently have different DHCP servers serving numerous vlans for many types of CPE devices. These were setup at different times by several vendors. I have a server on another network that I have translated these vlans into. I can get the dhcp discovers, but my DHCP server will not give out an IP as I don't have a range defined for these subnets.
Basically I want to setup a sandbox/catchall/honeypot DHCP server for our customer networks so if it gets a mac address that is not one of the denied ones (since they are allowed on another server), i want to allow all the unknown clients.
The trouble is, I don't want to carve up my existing subnets on the other servers to allocate so many IP's for all this extra gear.
MAC locking is not an option on the customer facing equipment as well.
Can DHCP allow a discover through our dhcp helper on our cisco (say subnet 10.2.2.0) and give out a completely different IP in say (10.50.0.0/16?)
Is this possible?
I always get no free leases if I have the subnet defined but no range.
If I don't list the subnet of 10.2.2.0 at all, it says unknown subnet.
I can't find anywhere that someone has setup a sandbox/catchall dhcp server to lock down all unknown traffic on a dhcp network, and assign it a different ip range where they can't get anywhere.
Any help would be greatly appreciated.