MobileIP has many more features. As the intent of this chapter is to get an overview of MobileIPv6, this section discusses some issues and features without trying to be comprehensive. The interested reader should refer to a MobileIPv6 book e.g., [Soliman, 2004].
As discussed previously, after the mobile node has changed location but before its correspondent nodes have received the binding update, there is a gap when the traffic is sent to the previous location, as shown in Figure 11.13. This handoff situation is solved in different ways, depending on the requirements of the applications and the layer 2 infrastructure. Two ways to solve the problem are described here. At the time of writing this book, no solution has been yet standardized at the IETF for fast handoff.
One solution [RFC4068] is where the mobile node requests to a router in the previous network to intercept all traffic going to the previous location of the mobile node, encapsulate the traffic and forward it to the new location, as shown in Figure 11.17.
A router in the previous network, named ‘foreign agent’, is offering the service on behalf of the mobile node. There are also some security issues of a router forwarding traffic of another node, without previous authentication.
When the mobile node is attached to multiple links, another solution ...