Firewall friendly Return-Routability Test (RTT) for Mobile IPv6
This document defines a slightly modified Return Routability Test (RRT) for MIPv6. The herein defined RRT mechanism is intended for CoA exchanges between the MN and the CN. Once the MN and CN find out their peers' valid addresses, an additional mechanism will be used to run connectivity checks to figure out which of the address pairs have connectivity and, if needed, open the required pinholes in the firewalls. The defined mechanism is intended to work with current firewalls without requiring any support from them. The document also addresses the use of UDP encapsulation to facilitate MIPv6 signaling between involved nodes.