As for direct IP addressing, it should be straightforward to filter out DNS queries and responses from the chatter, so access by domain names should be tolerable - as long as you filter DNS part from the chatter. But then, since you include DNS chatter to the test case, that means you also want to inspect that. And this adds up to the work you're carrying on.

That aside, I can't really see what can go wrong - deliberately - with a simple DNS name resolution. But since root servers are 0wned, you may have a point in wanting to inpect DNS chatter. It maybe worthwhile not to assess the browser, but to assess DNS infrastructure. Then again, testing DNS infrastructure is a different case that should be isolated from browser tests, I think.

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