One of the tricks in the past to get past captive portals that allowed only DNS traffic, but did not redirect DNS traffic to a controlled server, was to tunnel

One of the tricks in the past to get past captive portals that allowed only DNS traffic, but did not redirect DNS traffic to a controlled server, was to tunnel traffic through DNS. I remember I went on a cruise once and that was my plan to get out of having to pay exorbitant fees for data access on wifi. I never ended up doing it though, because I ended up not really using my phone or laptop while on the cruise, which I count as a win. It was a lot easier to not actually use the internet then though, as it was 10-15 years ago. The last time I was on a cruise, 3-4 years ago I think, I bought the wifi package, and it was so poorly implemented and/or overloaded that it was a pain at best to use. All things considered, not usually an issue when you're relaxing, but when you need it for a moment and it feels like you're using an old 3G connection, that sucks.