Dual stack IPv6 for IPv4 depletion

Sun Jul 5 02:35:48 UTC 2015

On Saturday, July 4, 2015, Josh Moore <jmoore at atcnetworks.net> wrote:

> Traditional dual stack deployments implement both IPv4 and IPv6 to the CPE.
> Consider the following:
>
> An ISP is at 90% IPv4 utilization and would like to deploy dual stack with
> the purpose of allowing their subscriber base to continue to grow
> regardless of the depletion of the IPv4 space. Current dual stack best
> practices seem to recommend deploying BOTH IPv4 and IPv6 to every CPE. If
> this is the case, and BOTH are still required, then how does IPv6 help with
> the v4 address depletion crisis? Many sites and services would still need
> legacy IPv4 compatibility. Sure, CGN technology may be a solution but what
> about applications that need direct IPv4 connectivity without NAT? It seems
> that there should be a mechanism to enable on-demand and efficient IPv4
> address consumption ONLY when needed. My question is this: What, if any,
> solutions like this exist? If no solution exists then what is the next best
> thing? What would the overall IPv6 migration strategy and goal be?
>
> Sorry for the length of this email but these are legitimate concerns and
> while I understand the need for IPv6 and the importance of getting there; I
> don't understand exactly HOW that can be done considering the immediate
> issue: IPv4 depletion.
>
>
> Thanks
>
> Joshua Moore
> Network Engineer
> ATC Broadband
> 912.632.3161
>

Yep, dual-stack does not solve problems for eyeball networks. This is why
eyeball networks use ds-lite, 464xlat, and map. Each requires some sort of
compromise.

At the end of the day, we all need to reject 'direct ipv4', it is an
invalid requirement that cannot be supported at scale over time.