[v6ops] Re: Name Collision IPv6 Research Study - Public Comment

[Brian E Carpenter <[e-mail]>]

Francisco,

> ICANN requests that specific feedback (from individuals or the group as a whole) is ultimately provided directly into the public comment website.

I'm sorry, but that is just the wrong process. You are suggesting an IPv6 special-use address, and that is something to be debated not in an ICANN process but in an IETF process. As is recorded in the relevant IANA registry [1], this is an assignment requiring IETF Review. In other words, ICANN cannot assign ffff:127.0.53.53; only the IETF could do so. The starting point would be an Internet-Draft aimed at the 6MAN working group.

As you are probably aware, the discussion has started on this (v6ops) list and on the 6MAN list ([e-mail]) but nothing is going to happen until somebody submits an I-D.

To be clear, in my opinion the requirement is a very reasonable one, but the choice of prefix and specific address is debatable, and various options have already been suggested.

[1] https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml

Regards/Ngā mihi
    Brian Carpenter
    (writing as an individual, but not forgetting that I was a signatory of the MOU published as RFC 2860).

On 31-Oct-25 06:08, Francisco Arias wrote:
> Dear colleagues,
> 
> ICANN has opened a public comment period on a research study titled "Controlled Interruption IPv6 Research Study". The study focuses on extending ICANN's "controlled interruption" mechanism, previously implemented using only the IPv4 address 127.0.53.53 into the IPv6 realm, given the growing adoption of IPv6 (> 40 % of hosts). The public comment period runs from 20 October 2025 to 22 December 2025: https://www.icann.org/en/public-comment/proceeding/name-collision-ipv6-research-study-20-10-2025 <https://www.icann.org/en/public-comment/proceeding/name-collision-ipv6-research-study-20-10-2025>
> 
> Controlled interruption is a phase in the establishment of a new generic top-level domain (gTLD) that is designed to reduce the risk of name collision. During controlled interruption, certain DNS resource records, designed to interrupt resolution processes, are temporarily published at and below the gTLD name. The content of these DNS records is intended to minimize any harm that arises from such interruption.
> 
> This study produces an initial list of candidate prefixes, followed by technical tests of multiple applications on popular end-user operating systems. The aim was to identify candidate addresses where DNS lookups returning that address did not result in any unintended external network traffic. A preferred candidate that met these criteria was identified: ffff:127.0.53.53, which is the IPV6 mapping of the original IPv4 controlled interruption address.
> 
> This mailing list is being alerted to request input on this topic. While there will undoubtedly be valuable discussions on this list around various aspects of this proposal, ICANN requests that specific feedback (from individuals or the group as a whole) is ultimately provided directly into the public comment website.
> 
> Regards,
> 
> -- 
> 
> Francisco.
> 
> 
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