Rebooted the LIVE RC 4.3 and this time, I was connected, Firefox worked and I found the IP address in the connection information.
BUT, then my wife connected to the internet with her wired connection, Windows 7, on her laptop. At that point, (my correlation may be spurious) I was no longer able to connect to any web address. I checked the characteristics and had to type in the IP address (which I had recorded on paper a few moments before). However, that address no longer worked. Rechecking the characteristics, I found the 'permanent' IP address, a Netmask of 255.255.255.0 and Gateway.
Hope this helps. Alternatively, my error may lie in typing in a 'permanent' IP address. I am clearly not an expert in such matters