Well… after a couple of days digging deeper into the source code, I was able to make hummingbird 1.1.2 compile and run in a Docker container with working network lock. Clone my fork from https://gitlab.com/fschaeckermann/hummingbird.git and read instructions in README.md I made it compile under Alpine Linux as well, but iptables seems to misbehave in some breaking way. Therefore the Alpine image is not really usable yet. @whiteowl3: I shamelessly copied your work and incorporated it in t