Hi, I don't know much other than what I've found out going through the same process as you, but I can tell you that the broadcast address is (according to Wikipedia) an IP address that can transmit information to all machines on a subnet. I asked about it on another forum and was told that it is worked out from the first three number blocks of the IP address and the first of the subnet (eg if the IP address is 192.168.1.1 with a subnet of 255.255.255.0 the broadcast address is 192.168.1.255).
"lo" is the loopback - 127.0.0.1 is your own computer.
I've had no trouble accessing the internet through my router with the eth0 IP address, subnet and gateway all exactly the same as in XP and I did nothing to the "lo" connection information. Not sure if that is helpful, but good luck with it.