111 © 2001, Cisco Systems, Inc. All rights reserved. Presentation_ID Mobile IPv4 Dynamic Home Agent Assignment Framework (draft-kulkarni-mobileip-dynamic-assignment-01.txt) 57 th IETF Vienna – 7/14/2003 Milind Kulkarni Alpesh Patel Kent Leung

222 Problem Statements Optimal Home Agent for geographically / topologically distant locations Reduce configuration needs on Mobile Nodes (HA not required) Allow network to select and administratively assign HA to MN Load balance MNs among multiple HAs

333 Nearest HA Example User moves to a distant location

444 Nearest HA Example Latency increases for registrations and tunneled traffic. Home Agent Mobile Node Printer

555 Dynamic HA Assignment Dynamically assigned HAs to anchor mobility sessions initiated within regions Home Agent Mobile Node Printer Home Agent X

666 HA Assignment Methods DHCP – Home Agent Option 68 AAA – 3GPP2 IS-835 DNS – Hostname resolution Static configuration Etc. Dynamic HA Assignment Framework

777 Terminology ALL-ZERO-ONE-ADDR (AZOA): IP address or Directed HA: Destination IP address of the Registration Request to targeted Home Agent. Assigned HA: IP address in the Home Agent field of an accepted Registration Reply. The designated Home Agent for the duration of the mobility session.

888 Dynamic HA Assignment Framework Foreign Agent Mobile Node Home Agent Router DS RRP COA or CCOA HA Assigned HAA … HA DS RRQ Directed HA COA or CCOA AZOA or HAA … HACOA CCOA Directed HA Assigned HAA Initial Registration Control Flow

999 Dynamic HA Assignment Framework Foreign Agent Mobile Node Home Agent Router DS RRP COA or CCOA HA Assigned HAA … HA DS RRQ Directed HA COA or CCOA Assigned HA … COA CCOA Assigned HA Assigned HAA Re-registration Control Flow

10 HA Redirection Foreign Agent Mobile Node Home Agent Router DS RRP COA or CCOA HA Assigned HAA … HA DS RRQ Directed HA COA or CCOA AZOA or HAA … HACOA CCOA Initial Registration Control Flow

11 HA Redirection Foreign Agent Mobile Node Home Agent Router DS RRP COA or CCOA HA Assigned HAA … HA DS RRQ Assigned HA COA or CCOA Assigned HAA … HACOA CCOA Re-registration Control Flow

12 AZOA Application Mobile Node registers to Assigned HA for duration of mobility session AZOA should be used to initiate a new mobility session Time AZOA used Assigned HA used Registration Requests Start Stop Start

13 Discussion Points

14 RFC 3344 Update The Home Agent MAY accept registration with assigned HA address different than in the registration request with unicast destination IP address

15 Directed vs. Assigned Framework provides flexibility to allow assigned HA to be same or different than the target of registration requests

16 MN-HA Security Considerations MN – HA SA manually configured or dynamic established, dependent on method MN – HA SA may be per HA or per administratively domain (for HAs within)

17 Q & A