However, it doesn't appear to be working. I've verified this through https://www.detectadblock.com/, but performing nslookup doubleclick.net over SSH yields a block.
Hey! My assumption would be that adblock blocks in-browser ads, and since detectadblock says ads are being allowed on all devices that don't have an adblocker I'm inclined to believe it isn't working. Unless that's not the kind of system this is.
For any mobile devices I was sure to disable all mobile data, and for all others they just automatically get stuff from the DNS. Therefore I'd assume that's covered.
All the default plus some of the malware and advert lists.
After some testing it does appear to be working! I guess it won't provide the same degree of noticeable change as installing uBlock Origin, but domains are being blocked.