Mobile Devices on IP Internetworks
Due to advances in miniaturization, Mobile computing has greatly increased in popularity over the past years. Today the users can get in a notebook PC or even a hand-held computer the power that once required a massive machine. Wireless LAN technologies help a device to easily move from one place to other and still retain networking connectivity at the data link layer. Unfortunately, the Internet Protocol was developed back in the era of those bulky or massive machines, thus IP is not designed to deal gracefully with computers that move around. To understand why IP doesn't work well in a mobile environment, take a look back at how IP addressing and routing function.