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I have one Windows 2003 DHCP Server, with one NIC in the subnet 192.168.40.x and I want to serve IPs from two differents subnets 192.168.40.x and 192.168.178.x. Now, I have the subnet 192.168.40.x full but the Server is not giving adresses from the other subnet. It is possible to do the server work with only one NIC?

My setup is this:

Windows 2003 Server [192.168.40.x]
· Scope [192.168.40.x] full
Router 192.168.40.x
Broadcast Adress
DNS Server 192.168.40.x, 192.168.178.x
· Scope [192.168.178.x] empty
Router 192.168.178.x
Broadcast Adress
DNS Server 192.168.40.x, 192.168.178.x

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It's possible to do this but let's step back and ask the question how your subnets are setup.

The regular, actually-works, way of doing this would be to have two VLANs, one per subnet, setup on your switch. If this is what you're doing then you can simply convert your DHCP server's switch port to trunk mode then setup two different virtual addresses on the same NIC, again one per VLAN. At this point the machine will genuinely be on both subnets/VLANs so can hand out IPs to machines on both.

If your setup is different to this please let us know and we'll try to help.

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I don't use VLANs, both subnets are in the same VLAN – xabim Dec 3 '10 at 9:21
Ah ok, have you tried adding a second IP address to your dhcp server in the second subnet? one physical adapter can have lots of IPs – Chopper3 Dec 3 '10 at 10:41

If your switch supports it, you can setup an ip helper address for the DHCP server. Your switch will then act as a broker for the DHCP request. You can also setup a DHCP Relay Agent which will do the same thing. A normal linux workstation can be setup in this way to act as a DHCP Relay agent.

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