Socat allow you to forward ports to a variety of things. For Docker forwarding a port to the docker.sock file makes a quick way to get access to the Docker remote api.
Docker also allow a way to open up that TCP port however on Mac it is temperamental and hard to use
brew install socat socat -d TCP-LISTEN:2375,reuseaddr,fork UNIX:/var/run/docker.sock &
Running Docker containers locally is a fairly common thing. Interconnectivity between containers works naturally. However, sometimes you may also want a container to connect back to the Docker Remote API. If you are constantly on the go changing networks you do not want to have to change that IP address every time.
A great use case for this is running Jenkins and using docker slaves
sudo ifconfig lo0 alias 192.168.99.50
There are also some interesting endpoints you can use for information
curl http://localhost:2375 curl http://localhost:2375/containers/json curl http://localhost:2375/images/json