Simple Mobile IP

This thesis describes an implementation and evaluation of an IP mobility management protocol, Simple Mobile IP. The protocol enables dynamic address allocation and configuration of mobile terminals through utilisation of DHCP. Simple Mobile IP provides IP mobility within one administrative domain, in contrast to the global mobility in conventional Mobile IP. Both protocols use IP tunnelling but in Simple Mobile IP the tunnel runs along the optimised route, thus avoiding triangular routing. The protocol was implemented on the Linux platform and evaluated in a wireless LAN environment. The solution detects subnet transitions at the link layer, resulting in loss of IP connectivity for approximately 100 ms when mobile terminals move between subnets. The overhead, introduced by IP tunnelling, reduces the throughput by 3.8% in a wireless LAN environment.