Oct 22 – 23, 2022 Workshop
Golden Tulip Zira
Europe/Belgrade timezone

IPv6 only Recursive Resolver

Oct 23, 2022, 10:25 AM
Mykonos / Rodos (Golden Tulip Zira)

Mykonos / Rodos

Golden Tulip Zira

Ruzveltova 35 11000 Belgrade Republic of Serbia
Standard Presentation Main Session OARC 39 - D2


Momoka Yamamoto


IPv6-only networks are expanding, with draft-xie-v6ops-framework-md-ipv6only-underlay being a recent example. For IPv6-only networks to be widely deployable, software must be able to function in IPv6-only networks. However, according to RFC3901 BCP91, "every recursive name server SHOULD be either IPv4-only or dual stack." Meaning recursive resolvers should not be IPv6 only. This is because some authoritative servers do not support IPv6. In an experiment, 15% of the top 500 domains failed to be resolved by an IPv6-only resolver because the authoritative server was IPv4-only.

We propose an IPv6-only network-compatible recursive resolver implementation. With this implementation, the IPv6-only recursive resolver will be able to send queries to IPv4-only authoritative name servers. This is accomplished by the resolver converting IPv4 addresses to IPv6 by adding the Pref64::/n prefix, which instructs the NAT64 to convert the IPv6 packets to IPv4 packets.

Presentation delivery In-person at the workshop venue

Primary author

Momoka Yamamoto

Presentation materials