I currently can't connect directly to my cable modem without using a router for some reason. The router isn't mine and is going to be taken soon, so I have to figure out the problem fast. I recently changed ISP's, but I don't know if that has anything to do with it or not. Before swithing I could unplug everything and connect straigt to the modem, but now I have a different modem(motorola sb5100) and it won't allow me to direct connect at all.

Needless to say I need some help. Is it the new modem, new ISP, or some random setting I need to change?

Any help, tips, advice is greatly appreciated!

Also, keep in mind, my knowledge in networking and broadband is limited.