At 5:50 -0700 9/28/11, Nicholas Weaver wrote:
Just a sampling of some of the version strings we've seen in scanning DNS resolvers and authorities:
...
(We have even received abuse complaints for querying for version strings!)
I think that hiding the version in a sarcastic way is going too far. I prefer to put in "contact xyz for this information." We put in URLs to contact.
Version discovery never was part of the protocol, so I wouldn't be inclined to include it. When offering a service though, hiding the unnecessary details is something I've come to appreciate.
One of the early lessons in this way came from the days when networks were "new" things. Working on a multi-building campus and a new thing called "fiber" we got a spool of fiber coated in red. Not orange, red. The only difference was the color of the outer sheath.
Once some of our internal relying parties found out that we had used the "red" fiber they waged war to get the "orange" fiber to replace it. Cooler heads prevailed and we swore never again to talk about the color of the fiber sheath in front of others.
As far as DNS as a service, I'd rather just have the customer say "I can't do this, and this is where I am". Once customers begin to diagnose the situation, they generally set up incorrect expectations. With incorrect expectations comes resentment when the real fix goes in against what they thought should have happened.
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