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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

IETF 90

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

I. Farrer, Q. Sun, Y. Cui

IETF90, Toronto

motivation

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
dhcp 4o6 softwire container

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
dhcp 4o6 softwire container format

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
ipv6 source address changing

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
next step

IETF 90

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