Built in ethernet not working on some networks

Ok i have read everything there is to read, that i can find, i have asked a mac specialist, and after all of this i am still baffled. I have been connecting to the internet from the vary first day that i received my mbp, via wireless and ethernet. There have been no problems until i go to work and try to connect through the built in ethernet.
I have received three different status messages when i try and play with the settings, one says
The cable for built in ethernet is connected, but your computer does not have an ip address and cannot connect to the internet.
Built in Ethernet is currently active. built in ethernet has a self assigned ip address and may not be able to connect to the internet
built-in ethernet is currently active and has the ip address
well with all of these messages my internet doesnt work.
I then go home plug in my cable there and it works fine.
Why cant life be easy...please help i am at my wits end

I have this same problem (and error messages) using the wired ethernet at work with my MBP. I turn off to travel to work, connect sucessfully to ethernet but when the MBP sleeps I loose the IP address. I have to go into Network preferences and switch from "automatic" to another location and then back to "automatic" to get the network IP address to re-populate. This did not occur when I first got the MBP, but started a few weeks later. I used powerbook G4 on this network with no issues for over a year. Never have an issue using wireless. I think I have used wired connection in a hotel without issues. Could it be something related to this network?
MacBook Pro Mac OS X (10.4.7)
Power Book G4 17 Mac OS X (10.3.8)

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