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IPv6 DNS Discovery Issues. Jaehoon Paul Jeong ETRI paul@etri.re.kr http://www.adhoc.6ants.net/~paul/ 1st March 2004 59th IETF – Seoul, Korea. Recent Decision on IPv6 DNS Discovery. DNSOP Decision

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IPv6 DNS Discovery Issues

Jaehoon Paul Jeong

ETRI paul@etri.re.kr http://www.adhoc.6ants.net/~paul/

1st March 2004

59th IETF – Seoul, Korea

IETF59 DNSOP WG


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Recent Decision on IPv6 DNS Discovery

  • DNSOP Decision

    • ADs and Chairs have decided to produce a document outlining the attributes of three DNS discovery approaches;

      • RA Option

      • DHCP Option

      • Well Known Addresses

  • Document of IPv6 DNS Discovery

    • Describes the outstanding problems and issues with IPv6 DNS Discovery

    • Details the following things;

      • Operational attributes of each solution

      • Various deployment scenarios

      • Analysis of a multi-solution resolution

      • Etc.

IETF59 DNSOP WG


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DNS Discovery Approaches

  • RA Option(draft-jeong-dnsop-ipv6-dns-discovery-01.txt)

    • RA DNS Server option

    • It can be delivered to IPv6 Host along with IPv6 Prefix Information option.

  • DHCP Option(draft-ietf-dhc-dhcpv6-stateless-04.txt, RFC 3646)

    • DHCP Recursive Name Server option

    • It can be delivered to IPv6 Host by either DHCPv6 server or Stateless DHCPv6 server (DHCP-lite).

  • Well Known Addresses(draft-ohta-preconfigured-dns-01.txt)

    • Preconfigured Well Known Anycast Addresses

    • It can be preconfigured in IPv6 Host.

IETF59 DNSOP WG


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How to apply each approach? - 1/2

  • Ordering between RA Option and DHCP Option

    • Criterion?

      • M and O flags

IETF59 DNSOP WG


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How to apply each approach? - 2/2

  • Ordering between two Options and Well-known Addresses

    • Criterion?

      • Well-known Addresses are last resort.

        • When IPv6 Host cannot get DNS server information though both RA and DHCP.

      • IPv6 Host can configure Well-known Addresses as the most preferable in its configuration file.

      • IPv6 Host can get the explicit fact that Well-known Addresses for DNS can be used in the site through RA Hint Option.

        • RA Hint Option indicates that Well-known addresses can be used for DNS name resolution.

        • RA Hint Option can be implemented by RA DNS Server Option with a new flag, Well-known Addresses for DNS.

IETF59 DNSOP WG


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Deployment Scenarios

  • Prefix Delegation Environment

    • When a leaf router gets a subnet prefix though Prefix Delegation protocol, such as DHCP, DNS server address(es) can be piggybacked.

    • Leaf router advertises DNS server address(es) with RA options.

  • Mobile Environment

    • MIPv6, HMIPv6 and NEMO

      • Through RA Options, DNS Server Addresses can be piggybacked with CoA Prefix Information.

        • There is no additional delay to discovery DNS Server.

      • Well-known addresses can be used for DNS name resolution.

        • If Hint option for Well-known addresses is used together, Mobile Node will be convinced that it can be served.

IETF59 DNSOP WG


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Discussion

  • Any questions or comments…

IETF59 DNSOP WG