Nomad on Mac as DHCP Server

Question

I'm using Nomad on a Mac desktop via an Eos programming wing and am attempting to use the Mac as a DHCP server to connect a Response 4 port gateway via an unmanaged PoE Netgear switch. I set the Mac IP address as an Eos console of 10.101.90.101 and a SubNet of 255.255.0.0. I've set the Sharing options from the ethernet port to share addresses. The gateway requests an address but defaults to a "network not found" address. Can anyone tell me what I'm doing incorrectly? Also, I have an Airport Express that I'd like to use for the iRFR. Should I perhaps use the Airport as the DHCP Server? 
 
 Thanks in advance for any assistance! 
 
 Matt

Matthew Gorka · Answer

Thanks for the comments. I cleared the Sharing setting on the Mac and set it to a Static IP in the 10.101 range and set up the Airport Express as the DHCP Server also in the 10.101 range. After rebooting the power, the gateway connected right away.