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Mobility Complexity

Explore the issues and challenges related to mobility in IP4 and IP6 networks, including scaling, ingress filtering problem, single point of failure, and security association. Address the issues and improvements in IP6 mobility structure, AAA association setup, and path MTU. Discuss other issues with IP6 mobility, such as AAA problems, conservative wireless operators, and operational experience questions.

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Mobility Complexity

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  1. Mobility Complexity IP4 and IP6

  2. IP4 Mobility • Static device talks to home agent • Bidirectional tunnel to mobile device • Else ingress filtering problem • Issues • Scaling • Single point of failure • Path MTU • Security association not specified No route optimization

  3. IP6 Mobility Structure • Static device talks to home address via care of address • Issues • Scaling improved • AAA association setup not complete in RFCs • ngtrans - additional issues due to IP4/IP6 transition? Direct to C/O Address

  4. IP6 in Motion • Static device talks to home address via care of address • Issues • Scaling improved • AAA association setup not complete in RFCs • ngtrans - additional issues due to IP4/IP6 transition? • Path MTU when router forwards to new care of address Direct to C/O Address

  5. Other issues with IP6 Mobility • AAA issues gate widespread deployment • But not fully specified in RFCs • IP6 AAA specifications moving target wrt mobility • Wireless operators conservative • Want to not be first to deploy • Operational experience questions in 3GPP etc • Deployed in CDPD, applications, but not as RFC 2002 • Service Providers have to support options • Not generally supported in IP4 • We have to make stationary IP6 servers support Home Address negotiation • May not be obvious to their vendors

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