I'm new to Mac so everything is new and frustratingly hard to find. If not for MacRumors and search engines... My wife and I have matching MacBooks with Mountain Lion. Frequently, one of us will be online wirelessly when the other will try to get online wirelessly or direct connect and both of us will get a message that "another device with the same IP address is trying to get online", meaning the second of the two MacBooks. At that point, the one trying to get online is denied access and the one that's already online is dropped and requires a power disconnect of the router before either of us can get back online. Is this a common problem with an easy solution? PS In addition to the two MacBooks, we have a VOiP phone system and the Sprint Rave connected to the router as well. When it calls for the router to be reset, I have to reset the Sprint Rave, also. The VOiP phone system doesn't seem to mind all the power downs and ups.