Newbie connectingti Internet

I am travelling with my new macbook pro and am unable to connect to the internet. I use DSL with wireless at home and have a cable modem / ethernet connection here. Following the setup as directed by Mac101 tutorial I get the warning:
"Built-in Ethernet has a self assigned IP address & may not be able to connect to the internet." and in fact it cannot.
I've tried several times with the same result. Am I to change something first or is there a better set of instructions?
Dick

The problem sems to be that the IP address is pre
assigned. I don't know why it is but it needs to let
the ISP assign it I think. Not sure if in setting up
my home DSL I set something incorrectly
try going to System Preferences > Network.
Double click on the current network connection. Choose the TCP/IP tab. Look at the first popup menu, called "Configure IPv4 using:" - it should be set to "Using DHCP". If it already is set to that, try choosing "Manually", and then re-choosing "Using DHCP". Also try clicking on the button called "Renew DHCP Lease". Both of these steps should force your machine to renew its DHCP lease.
Let us know how you get on, and if this is any help.

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