Self-Assigned IP error and no Internet thru cable, but fine via Airport crd

I am having a vert weird problem. Airport base station hooked to a LAN router, new Mac Pro (10.5.1) hooked via cable to Airport base station. I get the self-assigned IP address and no internet. This happens also if I hook Mac Pro directly to router via cable. Oddly enough, during all of this, my iBook connects fine to the Internet, thru the base station using its Airport card. What gives, I may throw in the towel and go out and by an Airport card for my Mac Pro to get Internet connectivity, even though it sits only 6 inches from the base station. Also not, my Power Mac G4 was hooked via cable to the Airport and worked just fine...
If someone discovers a fix, please feel free to email.
Thanks,
Bob A.

Funny you should mention that. This weekend I noticed that I can get an IP address and internet connection, either via the Ethernet cable from my AEBS or wirelessly from the AEBS on my laptop, but only one at a time and it depends which computer (iBook or Mac Pro) is on when the AEBS is toggled on/off. The only exception is my iPod touch, which can get an internet connection no matter which is the Internet connected machine(how's that for bizzare ?).
So, it appears the Linksys router that is hooked to our building's LAN is not distributing IP addresses (disconnecting the router and connecting the AEBS directly to the LAN produces the identical single IP address situation). Since using my Mac Pro with Leopard, I can only set up the AEBS in bridge mode, putting it in the DHCP mode causes the AEBS to be undetecable by the Mac Pro (haven't checked if the iBook sees it).
So I guess the questions are now:
- Shouldn't my router be assigning IP addresses from the LAN, isn't that it's job? Should I try buying a new one since I can't get AEBS to DHCP?
- Why would my iPod touch me immune from the single IP address situation?
- Any idea how to get Leopard to allow my AEBS to use DHCP?
Now I say I can't use DHCP, I mean that if I reset the AEBS, start from scratch and use assisted setup with Airport Admin Utility, and select DHCP at the place where you select Bridge or DHCP mode (or whatever the DHCP mode is called, I forget)the AEBS disappears. If I set bridge mode and then dicker around with DHCP manually, it doesn't disappear, but then it just won't give an IP address to any computer til re-rest and put back in old plain Bridge mode.
I would prefer to run the LAN right into AEBS and have it act as router and all that. I would also be fine with having a router and letting AEBS just bridge, just as long as I can connect to the Internet on more than one computer at a time.
I think I have a basic knowledge of what's going on, although my use of proper terminology is lacking, so feel free to follow up with any questions, I'd be happy to clarify.
This Leopard Mac Pro replaced a PowerMac G4 with Tiger and this all worked fine with it. When I traded computers and didn't get Internet I reset and re-setup the base station, so this might all be a Leopard problem
Of course, it brings me back to shouldn't the router hooked to my building's LAN be distributing IP addresses?
Thank you in advance for your help on this isssue.
Bob A.

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