How to do it...

1. Find your system's network interfaces and corresponding IP address(s) using the ifconfig command. For example, let's assume your system's IP address is 192.168.1.112.
2. Start the mongod daemon without any special flags:

mongod --dbpath /data/db

This starts the mongod daemon which binds to all network interfaces on port 27017.

1. In a separate Terminal, connect to your MongoDB server on this IP:

mongo 192.168.1.112:27017

You should see a MongoDB shell.

1. Now stop the previously running mongod daemon (press Ctrl + C in the Terminal) and start the daemon to listen to your loopback interface:

mongod --dbpath /data/db --bind_ip 127.0.0.1

1. In a separate Terminal, connect to your MongoDB server on this IP:

mongo 192.168.1.112:27017

1. This time the mongo client will exit with a connect failed message. Let's connect to your loopback IP and it should work:

mongo 127.0.0.1:27017

1. Stop the mongod daemon (press Ctrl + C in the Terminal) and let's start the daemon such that it binds to a different port as well:

mongod --dbpath /data/db --bind_ip 127.0.0.1 --port 27000

1. In a separate Terminal, connect to your MongoDB server on this IP:

mongo 127.0.0.1:27000

1. You should be connected to the server and see the mongo shell.