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DHCPv4 over DHCPv6 Source Address Option draft-fsc-softwire-dhcp4o6-saddr-opt-00

IETF 90. DHCPv4 over DHCPv6 Source Address Option draft-fsc-softwire-dhcp4o6-saddr-opt-00. I. Farrer , Q. Sun , Y. Cui IETF90, Toronto. IETF 90. Motivation. Deterministic 4over6 mechanisms require coupling IPv4 and IPv6 addresses A Softwire has to be sourced from a specific IPv6 address

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DHCPv4 over DHCPv6 Source Address Option draft-fsc-softwire-dhcp4o6-saddr-opt-00

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  1. IETF 90 DHCPv4 over DHCPv6 Source Address Optiondraft-fsc-softwire-dhcp4o6-saddr-opt-00 I. Farrer, Q. Sun, Y. Cui IETF90, Toronto

  2. IETF 90 Motivation • Deterministic 4over6 mechanisms require coupling IPv4 and IPv6 addresses • A Softwire has to be sourced from a specific IPv6 address • Addresses are pre-allocated (blocked out) for clients • Results are address wastage and lack of flexibility • This proposal signals the client’s v4-v6 binding source IPv6 address to server • Enables the dynamic set up of softwiresv4/v6 bindings • Flexible source v6 address choice • Any routable v6 address is OK • Uses a new DHCPv6 container to group options • A sign of using DHCPv4 over DHCPv6 for client provisioning

  3. IETF 90 DHCP 4o6 Softwire Container • DHCPv6 options • MUST be used within the DHCPv4-query/response messages • Enable DHCP 4o6 first • Contents in the container is bound to the DHCPv4 messages • Hint option is optional • Client: LPM to select a prefix • SrcAddr option MUST contain a /128 v6 addr

  4. IETF 90 DHCP 4o6 SoftwireContainer Format • Similar to containers in the map-dhcp document • Grouping relevant options • Re-use S46 BR option definedinmap-dhcp • Nothingnew: using agreed approach to provision softwire

  5. IETF 90 IPv6 Source Address Changing • DHCPv4 over DHCPv6 relies on IPv6 configuration • IPv6 source address changing causes DHCP 4o6 re-enable • When IPv4 renews/rebinds • Include this container along with DHCPREQUEST • Lw4o6 base requires lwB4’s dynamic provisioning re-initiated if IPv6 configuration changes

  6. IETF 90 Next step • It’s necessary to provide enough information to run dynamic 4over6 softwire mechanisms • Comments? • Adoption?

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