DHCP two NICS / two subnets

[Zstream]

Hi Everyone,

I've been building out my lab and built out a Windows DHCP server. I have a router that acts as a DHCP server as well. I'm having issues with one NIC being active and leased either from the Windows server or router and another NIC being turned on.

LAB IP subnet (internal) with Windows DHCP server

Windows clients
Linux clients
Windows servers

Router IP subnet (external) with dhcp server

Windows clients
Linux clients
Windows servers

If I enable the external NIC, they will receive an IP address from the router just fine. However, if I enable the internal NIC, the DHCP request never hits the windows dhcp server.

Thinking I'm missing something, but for the life of me I can't think of it.

 

[Zstream]

I've managed to get this working, more out of luck really. You have to do this at the hardware (hypervisor level) and separating out the nics.

 

[ZippyDan]

I read your initial description and I was totally lost. Consider drawing a diagram next time. Or specifying eth0 and IP and subnet and gateway for each device, so we can figure out what you mean.