I have that setup here. Basically you just install your two NIC adapters. I have one setup for DHCP and hooked to the outside line. The other i assigned a static IP address and use it for my FOG server and run it into a image switch. I use just the one gateway from my DHCP so that i can access the Internet on the server adapter. The biggest thing for me was that when i was setting up the server, to make sure i assigned the correct interface name when installing the FOG server. In my Linux setup is wasn’t just ETH0 or eth1. It was a totally different net name. So make sure you use IFCONFIG to see what your interfaces are. If your using Linux that is.
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@Quantum Thanks again for bringing SCCM, VLAN and ip-helpers up. I did not know about this possibility where the client will contact the boot server(s) after retrieving an IP address (quite often using broadcast). I thought this is only done by Mac OS X (called BSDP).
I tried to get this working in my lab but I couldn’t! I always see the following messages in syslog which means that isc-dhcp-server does not respond at all (checked with tcpdump) because it doesn’t want to without being able to offer a lease:
DHCPDISCOVER from ... no free leases
DHCPREQUEST for ... unknown lease x.x.x.x.
So I really wonder if anyone has got this working with ISC dhcpd and not range statement in the config.