I’ve historically used IP over DNS tunneling to pull this off. A major advantage of this approach is that it leverages a port and protocol that’s rarely blocke

I’ve historically used IP over DNS tunneling to pull this off. A major advantage of this approach is that it leverages a port and protocol that’s rarely blocked, and if 53 is blocked, you can generally still use the approved local dns servers for your data-carrying queries. These days, it looks like there are at least a few well-known pieces of software to do this, e.g. https://github.com/yarrick/iodine https://github.com/yarrick/iodine