7/28/2019 Ipv 6 Mobility

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IPv6 MOBILITYATAGLANCE

RFC 3775/3776

The goals of IPv6 mobility are:

Not constrained by location

Always on IP connectivity

Transport independent

Robust roaming connections

Application mobility

Application continuity

Mobile device can be a server

Mobile IPv6 (MIPv6) is defined in:

RFC 3775: Mobility Support in IPv6

RFC 3776: Using IPsec to Protect Mobile IPv6 Signalling

between Mobile Nodes and Home Agents

The same basic components exist in MIPv6 as in MIPv4,except there are no foreign agents in MIPv6.

Figure 1

While a mobile node is at home, packets addressed to itshome address are routed to the mobile nodes home link,using conventional Internet routing mechanisms.

Figure 2

When an MN moves to a foreign link, the MN will receivea care-of-address (CoA) using stateless or stateful autocon-figuration. The MN will then send a binding update to theHA with the MNs new CoA for use while roaming.

Figure 3

There are two ways to handle packet forwarding betweencorrespondent nodes (CNs) and MNs:

Route optimization mode

Bidirectional tunneling mode

Route optimization mode:

Uses type 2 routing header

Requires MIPv6 functionality on the CN

Initial packets are routed from the CN to the MN via theHA

MN replies to CN directly, and CN does a binding cacheupdate for MN's new CoA

Subsequent packets between CN and MN are routeddirectly with no interaction needed on the HA

Bidirectional tunneling mode:

Does not require MIPv6 functionality on the CN

All traffic between the CN and MN is routed via the HA

Useful when requiring MNs to have traffic inspected athome network by IDS, virus scanning, and firewalls

Allows for mobility without requiring MIPv6 code on allCNs that the MN may need to communicate with

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Correspondent

Node

Home Link

Internet

Home Agent

Mobile Node

Correspondent

Node

Home Link

Internet

Mobile Node

Home Agent

InternetBindingAcknowledgement

BindingUpdate

Mobile Node