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Mobile IP Regional Registration

Mobile IP Regional Registration. Sasikanth Avancha CMSC 691T Spring 2000. Motivation Terminology Protocol Description Router Discovery Extensions Regional Extensions Authentication Extensions. Motivation. Reduce signaling delay for registrations

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Mobile IP Regional Registration

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  1. Mobile IP Regional Registration Sasikanth Avancha CMSC 691T Spring 2000

  2. Motivation • Terminology • Protocol Description • Router Discovery Extensions • Regional Extensions • Authentication Extensions

  3. Motivation • Reduce signaling delay for registrations • Reduce number of signaling messages sent to HA • Possibly improve hand-off performance

  4. Terminology • GFA – Gateway Foreign Agent • RFA – Regional Foreign Agent • NAI – Network Address Interface • HFA – Hierarchical Foreign Agent • COA – Care-of Address • RRQ – Registration Request • RRP – Registration Reply • AAA Server

  5. The Protocol • Overview • MH at home behaves as required by RFC 2002 • MH in a visited domain • Registers with HA when it first enters the visited domain; MAY set GFA as care-of address • Registers with GFA on subsequent moves within domain; MAY set RFA as care-of address • Receives data traffic from CH as described in RFC 2002

  6. The Protocol • FA, RFA, GFA • FA MAY advertise itself and/or RFA(s); MUST advertise GFA • Advertisements have I-bit set to indicate regional registration support • Ads with only GFA MUST include FA NAI extension • FA adds HFA extension to RRQ with COA field == 0 • FA sends RRQ directly to HA if COA == FA • GFA maintains binding for MH

  7. The Protocol • HA • Sets GFA, RFA or co-located address as COA for MH • Distributes registration key to MH and GFA • Encapsulates datagrams and tunnels to GFA

  8. Extensions • Router Discovery • Regional Tunnel Management Flag: the I-bit • FA NAI Extension • A string in the NAI format; SHOULD appear in Agent Adv • RRP Flags: unknown GFA, GFA unreachable (host, port, other)

  9. Extensions • Regional • GFA IP Address extension • Contains publicly routable IP address of GFA • Added to RRQ by FA if COA field is 0 • HFA extension • Contains IP address of FA the MH has chosen as COA • GFA uses it to create binding for MH

  10. Extensions • Replay Protection • Contains replay protection style and initial identification • Authentication • FA-FA authentication • MH-GFA authentication • Used whenever MH has co-located COA • Used to authenticate Regional RRQ

  11. Reference • Gustafsson et al, Mobile IP Regional Registration, IETF Internet Draft (Work in Progress; expires Sept 6, 2000)

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