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Re:4.2.2.2: The story behind a DNS legend by dedward on Wednesday April 21, 2010 @04:13PM (#1283162)
Curious - what obligates them to provide DNS service?
Re:4.2.2.2: The story behind a DNS legend by Zak on Wednesday April 21, 2010 @06:32PM (#1283401)
From a legal point of view, it would be fairly easy to make a case that it's implied when you sell internet access.

From a business point of view, failure to provide DNS would appear no different from an outage to the vast majority of users. An ISP that didn't provide DNS would be out of business in very short order.