[arin-ppml] ARIN-2025-8: Global Anycast and IPv6 Transition

[Eric C. Landgraf]

On Oct 07 20:23, Charlie Fish wrote:
> Reserving 4.10 resources for IPv6 deployment is great, however, I’m
> concerned about restricting their use to the ARIN service region.
> Allowing for global Anycast could allow a single IPv4 /24 to support
> dual-stack authoritative DNS, or IPv4 reverse proxies that sit in
> front of a IPv6-first network, across multiple regions. Limiting 4.10
> resources to the ARIN region would only increase latency for my users.
> 
> It looks like ARIN-2025-5 previously included language permitting
> global Anycast when consistent with an ARIN region justification.
> However it looks like that proposal was abandoned. I’m curious if this
> particular use case has been considered separately under ARIN-2025-8.
> 
> Would it make sense to preserve global Anycast under 4.10, provided
> the resources are legitimately supporting IPv6 deployment within the
> ARIN region as well?

"Anycast" is not a term defined or used in the NRPM. The language of
2025-8 says this is to "facilitate IPv6 deployment within the ARIN
service area"; provided your global anycast service facilitates IPv6
deployment within the ARIN service area, I think it need not be used
*exclusively* within the ARIN service area.

Draft Policy 2026-5 "Define Out of Region Use" is an active effort to
clarify this.

	Eric C. Landgraf
	Virginia Tech