Subnet Roaming
Unfortunately, mobile users often experience broken network
sessions as they transit (roam) subnet boundaries. One way to solve this problem
is with the use of a vendor subnet-roaming solution that provides session and network layer address persistence. Most EWG
manufacturers provide for subnet-roaming solutions. These types of EWG solutions
are often client/ server or master/slave in nature, with one unit as the
controller (master) and the other(s) being controlled (slaves), while other
solutions are stand-alone and self-sufficient. IETF RFC 2002 addresses the
Mobile IP protocol, and the forthcoming IEEE 802.11f standard will address
seamless mobility through the Inter Access Point Protocol (IAPP) [27].