Please provide further detail on these '"big" recursive resolvers' that ignore TTLs. I'm yet to see one in the wild and so I'm somewhat dubious of the claim.
(Please don't be vague - post the addresses of the resolvers in question.)
(Please don't be vague - post the addresses of the resolvers in question.)
Which would have been fine - the A records were the same - but no, NetSol instantly starts serving a blank "Business Profile" landing page A-record. Thanks, people who used to run the Internet.
I know one such caching server was ns1.dns.rcn.net. (But only from inside RCN; querying it from Comcast gave different results. Same IP address, so I'm assuming it's anycast.) whatsmydns.net reported others as "Bell South" and "Cox" (I can't recall the locations, I think one was in Georgia).
EDIT: It also does the right thing with even shorter TTLs - try `dig 40.2.+.rp.secret-wg.org txt @ns1.dns.rcn.net`.
Also, if you're not on RCN, you aren't getting the same NS1 as someone who is. (Again, I assume anycast or load balancing, but I'm handwaving; I haven't understood routing since gated.conf changed.)
My boss was on RCN at home, and I was a few miles away on Comcast. We both pointed dig at 207.172.3.8 and hammered on our domain name; he saw stale results, I saw fresh ones.
Would've loved to have the expertise and tools set up to figure out what went wrong, but we just went to bed and by lunch it sorted itself out.