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DNS64 draft-bagnulo-behave-dns64-01

This document outlines the application scenarios and functions of DNS64 in an IPv6 network to IPv4 Internet environment. It discusses the role of DNS64 in resolving FQDNs, NAT64 translations, and supporting legacy hosts. The guidelines detail deployment options and considerations for DNS64 location, and address design questions related to synthetic AAAA RR tagging. It also proposes behaviors for DNS64 server modes and DNSSEC support, emphasizing seamless communication between IPv6 and IPv4 networks.

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DNS64 draft-bagnulo-behave-dns64-01

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  1. DNS64draft-bagnulo-behave-dns64-01 m. bagnulo, P. Matthews, I. van Beijnum, A. Sullivan, M. Endo IETF 73 - Vancouver

  2. Application scenario DNS64 NAT64 IPv6 Only host IPv4 Only Host • Communications initiated by the v6-only host • No support for communications initiated by the v4 only side without previous action from the v6 side (i.e. No support for v6 only servers, beyond the creation of static mappings) • No changes required in any host for basic functionality • Supports communications initiated using the FQDN (of the v4 node) using DNS64

  3. Application scenario – refinedAn-IPv6-network-to-IPv4-Internet DNS64 NAT64 IPv6 Only host IPv4 Only Host IPv6 end site or IPv6 end site and IPv6 ISP IPv4 Internet

  4. Application scenario – refinedIPv6-Internet-to-an-IPv4-network DNS64 NAT64 IPv6 Only host IPv4 Only Host IPv6 Internet IPv4 end site

  5. DNS64 function location • DNS64 can be located: • In the local name server • Simplifies deployment • Supports legacy hosts • In the end host • Enables additional features e.g. Validating stub-resolver

  6. OverviewAn-IPv6-network-to-IPv4-InternetDNS64 in the local name server DNS64 DNS v4 NAT64 AAAA RR for FQDN(H4) ? IPT H4 IP4 v6 H6 IP6

  7. OverviewAn-IPv6-network-to-IPv4-InternetDNS64 in the local name server DNS64 DNS AAAA RR for FQDN(H4) ? v4 NAT64 AAAA RR for FQDN(H4) ? IPT H4 IP4 v6 H6 IP6

  8. OverviewAn-IPv6-network-to-IPv4-InternetDNS64 in the local name server DNS64 enpty DNS AAAA RR for FQDN(H4) ? v4 NAT64 AAAA RR for FQDN(H4) ? IPT H4 IP4 v6 H6 IP6

  9. OverviewAn-IPv6-network-to-IPv4-InternetDNS64 in the local name server DNS64 DNS A RR for FQDN(H4) ? v4 NAT64 AAAA RR for FQDN(H4) ? IPT H4 IP4 v6 H6 IP6

  10. OverviewAn-IPv6-network-to-IPv4-InternetDNS64 in the local name server DNS64 IP4 DNS A RR for FQDN(H4) ? v4 NAT64 AAAA RR for FQDN(H4) ? IPT H4 IP4 v6 H6 IP6

  11. OverviewAn-IPv6-network-to-IPv4-InternetDNS64 in the local name server Synthetizes AAAA RR as Pref::/96+IPv4 DNS64 DNS v4 NAT64 IPT H4 IP4 v6 H6 IP6

  12. OverviewAn-IPv6-network-to-IPv4-InternetDNS64 in the local name server DNS64 DNS v4 NAT64 AAAA RR Pref:IP4 IPT H4 IP4 v6 H6 IP6

  13. OverviewAn-IPv6-network-to-IPv4-InternetDNS64 in the local name server DNS64 DNS v4 NAT64 IPT H4 IP4 v6 H6 IP6 Src: IP6,s Dest: Pref:IP4,d

  14. OverviewAn-IPv6-network-to-IPv4-InternetDNS64 in the local name server DNS64 DNS v4 NAT64 IPT H4 IP4 v6 H6 IP6 IP6,s<->T,t

  15. OverviewAn-IPv6-network-to-IPv4-InternetDNS64 in the local name server DNS64 DNS v4 NAT64 IPT H4 IP4 v6 H6 IP6 Src: T,t Dest: IP4,d

  16. A couple of design questions

  17. Tagging Synthetic AAAA RR • When AAAA RR are synthesized by other than the auhtoritative server, different DNS64 can synthesize different AAAA RR • Different answers for the same fqdn depending on the part of the topology • Question: Does it make sense to tag these as synthetic?

  18. How to tag synthetic AAAA RR? • IF we decide to tag synthetic RR, how should we do that? • New RR AAASYNT • We would have to synthesize BOTH the AAAA RR and the new AAAASYNT RR • The DNS response includes the synthetic AAAA RR and the AAAASYNT RR in the additional information • Updated apps can query directly for AAAASYNT RR • EDNS0 option: • Add the ENDS0 option when the AAAA RR contained in the answer is synthetic • Limitation is that the marks only the transport

  19. DNSSEC support • An-IPv6-network-to-IPv4-Internet case • Difficulty is how to validate data when the DNS64 is synthesizing RR for other domains • IPv6-Internet-to-An-IPv4-network • Auhtoritative server synthezising AAAA RR • Main difficulties is when to sign the new RR

  20. DNSSEC support • Rso: security-oblivious server working in recursive mode • Rsa: security-aware server working in recursive mode • Rsav: validating security-aware recursive name server • Rsan: validating security-aware recursive name server • The recursive server is also performing DNS64.

  21. DNSSEC casesAn-IPv6-network-to-IPv4-Internet case

  22. Proposed behaviour (I)An-IPv6-network-to-IPv4-Internet case • If CD is not set and DO is not set, the server SHOULD perform validation and do any translation it wants. The DNS64 functionality MAY translate the A record to AAAA. • DNS64 server mode • If CD is not set and DO is set, then it SHOULD perform validation. If the data validates, the server MAY perform translation, but it MUST NOT set the AD bit. If the data does not validate, it MUST respond with RCODE=2 (server failure). • DNS64 server mode

  23. Proposed behaviour (II)An-IPv6-network-to-IPv4-Internet case • If the CD is set and DO is set, then it SHOULD NOT perform validation, and it SHOULD NOT perform translation. It SHOULD hand the data back to the query initiator, just like a regular recursing server, and depend on the client to do the validation and the translation itself. • DNS end host mode

  24. DNSSEC IPv6-Internet-to-An-IPv4-network • When is the synthesis performed? • If done when the query is received, can we sign the RR on the fly? • How this interacts with DynDNS?

  25. Questions?

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