Without a DNS server

[bortzmeyer]

Not very important but it can help: how to do it without a DNS server

[bart-roos]

We thought about doing exactly this at first, but then realised that this won't catch incoming DNS requests via TCP.

[bortzmeyer]

Fair enough, I understand. (Also, not having a DNS server prevents to return responses with an ultra-short TTL so you don't master the caching of the SERVFAIL.)

[bart-roos]

Fair enough, I understand. (Also, not having a DNS server prevents to return responses with an ultra-short TTL so you don't master the caching of the SERVFAIL.)

Well, as a unique subdomain is generated for each check, caching shouldn't be an issue.