Faste IP-adresser i IPv6

[cub71]

Har lest litt om IPv6 hvor det står at det blir minst 1500 adresser pr kvadratmeter på hele jorda og at dette åpner for at alle dingser kan ha sin egen faste IP-adresse.

 

Det jeg lurer litt på er at jeg ville tro det ville by på problemer om jeg tar med telefonen til langtbort. Den må jo da oppdatere sin adresse i DNS-systemet og dette vil vel ta litt tid?

 

Som dere skjønner har jeg ikke noe greie på dette, bare kom på at det kunne være et problem. Noen som kan forklare dette?

[Knopfix]

Skrevet av Cisco.

 

Mobility is a very important feature in networks today. Mobile IP is an IETF standard available for both IPv4 and IPv6. Mobile IP enables mobile devices to move without breaking current connections. In IPv6, mobility is built in, which means that any IPv6 node can use it as needed. However, in IPv4, mobility is a new function that must be added.

The routing headers of IPv6 make Mobile IPv6 much more efficient for end nodes than Mobile IPv4. Mobility takes advantage of the flexibility of IPv6. For example, binding uses some header options (destination) that are mandatory for every IPv6 device. Also, IPv6 mobility creates a new “mobility” extension header.

IPv6 mobility is different from IPv4 mobility in several ways:

 

The IPv6 address space enables Mobile IP deployment in any kind of large environment.

Because of the vast IPv6 address space, foreign agents are no longer required. Infrastructures do not need an upgrade to accept Mobile IPv6 nodes, so the care-of address (CoA) can be a global IPv6 routable address for all mobile nodes.

The Mobile IPv6 model takes advantage of some of the benefits of the IPv6 protocol itself. Examples include option headers, neighbor discovery, and autoconfiguration.

In many cases, triangle routing is eliminated, because Mobile IPv6 route optimization allows mobile nodes and corresponding nodes to communicate directly. Support for route optimization is a fundamental part of the protocol, rather than a nonstandard set of extensions. Support is also integrated into Mobile IPv6 for allowing route optimization to coexist efficiently with routers that perform ingress filtering. Mobile IPv6 route optimization can operate securely even without prearranged security associations. It is expected that route optimization can be deployed on a global scale between all mobile nodes and correspondent nodes.

Mobile nodes work transparently even with other nodes that do not support mobility (same as in IPv4 mobility).

The dynamic home agent address-discovery mechanism in Mobile IPv6 returns a single reply to the mobile node. The directed broadcast approach used in IPv4 returns separate replies from each home agent.

Most packets sent to a mobile node while it is away from home in Mobile IPv6 are sent using an IPv6 routing header rather than IP encapsulation, reducing the amount of resulting overhead compared to Mobile IPv4.