troubleshooting Question

DHCP for 2 NIC connected to 1 computer with cross over cable

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fugazer asked on
Networking Hardware-OtherDHCP
27 Comments1 Solution1562 ViewsLast Modified:
Hello, My setup goes as follows:

- Windows 2003 behind linksys router (dd wrt) via NIC #1 (static ip)
- DHCP is disabled on router and installed and working on W2K3

I can successfully have other people connect to my router and the server and my windows DHCP works no problem.

- I have a second NIC installed within my W2K3 machine
- I have NAT setup to allow internet and networking via NIC#2
- My working computer (mac) is connected to NIC #2 with a cross over cable

The reason i connect to NIC#2 via crossover cable is because my router doesn't connect at 1000T.. I would like this fast connection with my working computer (mac mini) and my server so that's why i have not connected directly to the router.

So my mac only works if i manually assign its TCP/IP settings.. Which are:

Router: (this is the ip address of NIC#2 in the windows box)
Search Domain:

This is fine.. it connects (i can use the internet and connect to my active directory).. But when i change my setting from a static configuration to DHCP i get these settings:

Subnet Mask:
DNS: 'nothing'
Search Domain: 'nothing'

and nothing works.. i can't see my server, can't connected to the internet etc..

I'm connected the mac directly via a cross over cable so i'm wondering if thats the problem?? Why isn't DHCP assigning an address to my mac? Is it because i need router in between or something? Is my understand of NAT wrong in the first place? Does a DHCP scope need to be assigned to NIC#2? and what's DHCP relay, does this have anything to do with it?? It all seems confusing at first, but with a little logic i will understand what i'm doing wrong.

I've figured out alot of W2K3 on my own as well as understanding how networking works.. But i'm still kind of new to the termanolgies used and i often find myself spending hours trying to fix a problem that would ordanarly take minuits if i knew my logic was correct in the first place..

Any advice regarding my setup would be most helpful.. Thanks in advance, i'm new to Experts Exchange and have already found this to be a great community.  

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