
90 ◾ IP Communications and Services for NGN
Hence, its location can be determined on the Internet. When the mobile node
moves to network B with Prefix_B (Figure 4.5), it relinquishes the Prefix_A and
takes on the Prefix_B and uses it to complete its IPv6 address.
e HA keeps track of the CoA address of the MH and uses tunneling to send
packets from the CN to an MH. It uses IP-IP tunneling and creates a virtual con-
nection between the CoA of the MH and the HA (Figure 4.6). In this manner,
packets sent to the home address are sent to the CoA and the MH appears to the
HA as if it is at home.
Using a proxy neighbor discovery, the home agent is able ...