Mobile IPv4 high availability

Mobile IPv4 specifies a protocol in order to enhance transparent routing of IP datagrams. The main objective of this protocol is to ensure an ability to communicate in a mobile environment where a node can change its place. An essential part of this protocol is a Home Agent, a router on the Mobile Nodes home network, which has a responsibility to tunnel datagrams to the node. In order to locate Home Agent some sort of high availability mechanism is needed. The scope of this paper is to describe these mechanisms. The goal is to compare and analyse high availability mechanisms. Effort is also put on suggesting future work and analysing remaining needs around this topic.