[octomelon]

There's a lot of daft DNS code out there that makes strange assumptions. My favorite example isn't quite relevant here but I'll mention it anyway because I think it paints the picture well: PowerDNS purportedly added compression support in its responses because a common stub resolver required answer owner names to be a compression pointer to the question.

EDIT: Found a reference:

"Turns out some customers were using a CPE router that thought ‘C0 0C’ was some kind of ‘answer starts here’ marker. And if it did not find that marker, its DNS component would crash. And at that time, PowerDNS did not compress that first response record, so there was no ‘C0 0C’."

-- https://berthub.eu/articles/posts/history-of-powerdns-2003-2...