2/ In 1999, an extension was added to DNS. Since them, a bunch of DNS clients have behaved badly with the extensions, so DNS servers have implemented workarounds to stop things from breaking.
You're an awesome dude that I look up to! Take a breath! I think 5/ is just wrong :) Clients generating or not generating EDNS0 has nothing to do with this.
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To do a meaningful packet sniff test you'd have to do something like dig +edns0 @[auth server] and see how the authoritative server responds. Most clients don't have a mode like that, and you'd need to do for every domain you're curious about.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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