And the wonderful issues that can come with it sometimes. Although I suspect much less now that large responses are more common. Back in the day a very popular

And the wonderful issues that can come with it sometimes. Although I suspect much less now that large responses are more common. Back in the day a very popular registrar that included DNS service would have random issues with the size of DNS response when it switched over to TCP, returning servfail instead of answer. I'm guessing it was a load balanced cluster and some of the servers were broken. We reported the issue a few times but never heard back, as expected.