Mobility enables people with mobile network
devices??”many with wireless connectivity??”to move around in networks:
??” Mobile IP is an Internet Engineering Task Force (IETF) standard that is
available for both IPv4 and IPv6. The standard enables mobile devices
to move without breaks in established network connections. Because
IPv4 does not automatically provide this kind of mobility, you must add
it with additional con?¬?gurations.
??” In IPv6, mobility is built in, which means that any IPv6 node can use
mobility when necessary. The routing headers of IPv6 make mobile IPv6
much more ef?¬?cient for end nodes than mobile IPv4 is.
Transitioning to IPv6 273
??” IPsec is the IETF standard for IP network security, available for both
IPv4 and IPv6. Although the functionalities are essentially identical in
both environments, IPsec is mandatory in the IPv6 protocol. IPsec is
enabled on every IPv6 node and is available for use, making the IPv6
Internet more secure. IPsec also requires keys for each party, which
implies global key deployment and distribution.
?– Transition richness: You can incorporate existing IPv4 capabilities with the added
features of IPv6 in several ways:
??” First, you can implement a dual-stack method, with both IPv4 and IPv6
con?¬?gured on the interface of a network device.
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