Editing Mobile IP (section)

== Applications ==
In many applications (e.g., [[VPN]], [[VoIP]]), sudden changes in network connectivity and IP address can cause problems. Mobile IP was designed to support seamless and continuous Internet connectivity.

Mobile IP is most often found in wired and wireless environments where users need to carry their mobile devices across multiple LAN subnets. Examples of use are in [[roaming]] between overlapping wireless systems, e.g., IP over [[Digital Video Broadcasting|DVB]], [[Wireless LAN|WLAN]], [[WiMAX]] and [[Broadband wireless access|BWA]].

Mobile IP is not required within cellular systems such as 3G, to provide transparency when Internet users migrate between cellular towers, since these systems provide their own data link layer [[handover]] and roaming mechanisms. However, it is often used in 3G systems to allow seamless IP mobility between different [[packet data serving node]] (PDSN) domains.