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This still works in a lot of circumstances with iodine[0], including several US domestic flights.

Is DNS tunneling not used anymore? I've been thinking of setting one up recently

It’s used by malware, and detectable via high entropy nature of the traffic (most domains don’t have thousands of txt records containing b64). Recently I sent a 1mb file over dns, which terminated abruptly, I suspect dns resolvers blacklisted the domain.

It also multiplies bandwidth by at least 2-3x I think, so I’d call it bad etiquette to use unless you have a very very good reason to.

Gotcha, I see. I just wanted to use it to get around captive portals when necessary, but if DNS blacklisting is an issue, oof...

ive seen a few only allow their resolver to be used to resolve specific A records, like just enough to pay/check out.

What I mean is I suspect upstream resolvers (google, cloud flare, etc) blocked my domain from resolving any cache misses.

I used to use ICMP Echo tunnelling, and had really fast internet compared to the rest of the 50 person office, which had a heavily throttled link except for ICMP.