2 - Describe all the various methods and tactics by which end user "brokenness" can be detected. This may include website-based detection, DNS-query-based detection, or a variety of other methods.
Suggestions: (Nick Weaver I think had one pasted below) Also, you can make an EASY in-browser Javascript check. Load 3 images in a hidden DIV. These images should ideally be set to be non-cached and have a cache-buster in the URL (akin to how Google Analytic's hidden GIF is loaded: it contains a cache-buster in the URL). One is hosted on an IPv4 only site, one on a IPv4/IPv6 dual stack, and one on a IPv6 only site, and bind onload/onerror to Javascript for reporting. If the first two load, the host is a successful V4 host. If only the first loads, the host has the described problem with a link local V6, and needs to be patched: have the Javascript notify the user. If only the second and third loads, the host is V6 only (HA!).
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