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IPv6 DNS Discovery Issues. Jaehoon Paul Jeong ETRI [email protected] 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

IPv6 DNS Discovery Issues

Jaehoon Paul Jeong

ETRI [email protected] http://www.adhoc.6ants.net/~paul/

1st March 2004

59th IETF – Seoul, Korea

IETF59 DNSOP WG

recent decision on ipv6 dns discovery
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

dns discovery approaches
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

how to apply each approach 1 2
How to apply each approach? - 1/2
  • Ordering between RA Option and DHCP Option
    • Criterion?
      • M and O flags

IETF59 DNSOP WG

how to apply each approach 2 2
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

deployment scenarios
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

discussion
Discussion
  • Any questions or comments…

IETF59 DNSOP WG

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