A security gateway/home agent controller HAC is used to assign one home agent HA from a plurality of HAs and to identify at least one security protocol that is common between a mobile node MN and the assigned HA. Establishment of a security association between the MN and the assigned HA is enabled according to the identified security protocol and utilizing bootstrapping parameters provided over a secure connection between the security gateway/HAC and the MN. The bootstrapping parameters include at least a home address for the MN, an address of the assigned HA and security credentials and security parameters for the identified at least one security protocol. In an exemplary embodiment the home address for the MN may be an IPv6 home address and the MN may have certain capabilities with respect to security protocols and ciphering suites which the MN sends to the security gateway.