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I think that although the draft mainly discusses aaaa-whitelisting, it can be more specific in section 2 on issues impacting content delivery over ipv6.
Perhaps the biggest challenge in the IPv4-to-IPv6 transition is that the two protocols are not compatible; that is, IPv4-only systems cannot talk directly to IPv6-only systems. This means no one can turn off IPv4 support until every last device
they want to reach has acquired IPv6 connectivity. Unfortunately, many existing devices — including PCs running older OSes, as well as older cable and DSL modems, wireless routers, and other business and consumer electronic devices—have either limited or no
IPv6 support. In other words, companies will have to support both protocols for years to come, in a long and bumpy transition period. During that time, there will effectively be two Internets, an IPv4 one and an IPv6 one, loosely bound together into a hybrid
Internet by various transition technologies.
Challenges of reaching IPv6 users from IPv4 sites
Many types of Web applications rely on an end-to-end connection, where each device, household, or entity is associated with a single IP address. CGN breaks this assumption — as it creates a situation where hundreds or thousands of end users
— related only by their network provider — share the same IP address, and each user’s IP address may change with every new connection. Thus, CGN cripples functions like geo-location — using the user’s IP address to determine their location, in order to personalize
content or to enforce licensing restrictions, for example, and abuse mitigation — IP blacklisting or whitelisting, in order to block spammers, trolls, or other abusive users.
CGN breaks assumptions that many of today’s Web applications rely on. In particular it affects applications, such as peer-to-peer and VoIP, which rely in some way on a unique end user IP address. Troubleshooting the issues is extremely complex
and costly, as it can’t be done without the NAT operator’s help.
In order to reach IPv4 sites, IPv6 end users need to go through a NAT64 gateway. Because there may be only one or two such gateways within a network, communications may be forced through long, indirect paths. In addition, these gateways quickly
become congestion points within the network, as well as easily targeted points of failure, further affecting the performance and reliability.
Challenges of reaching IPv6 users from IPv6 sites
Because the IPv6 Internet is still sparsely connected, native IPv6 communications may require longer, less direct routes than their IPv4 counterparts, resulting in slower performance and higher packet loss. This is particularly troublesome
for high throughput or low latency applications such as online gaming or streaming media. In addition, a significant portion of the IPv6 Internet currently relies on tunneling traffic over IPv4, creating additional performance degradation.
So I think that content providers and application providers are no longer pondering when to enable delivery over IPv6 but are focused on how to manage this transition in a manner that is cost-effective and efficient in the short term but takes into account long-term needs and opportunities. Sent from my iPad
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