
292 Part Two • IPv6 Protocols
advertisement to determine whether it is on its home network or some
other network. If it is on a foreign network, it requests a care-of address
from the mobility agent and then notifies a mobility agent on its home
network of the care-of address. Communication to and from the mobile
node can then be accomplished by tunneling through the remote network
using the care-of address.
As we’ll see, under IPv4 the process of enabling mobility requires adding
special agents and servers, as described in RFC 3344, “IP Mobility Support
for IPv4.” However, the careful design of IPv6 protocols, especially the
use of neighbor discovery ...