Please follow the below steps to overcome the issue of the network is not getting to Cloudera CDH3

You will find the highlighted symbol in the Cloudera when it is not connected.

In order to overcome this issue please select the symbol and click on the Auto eth0. It will connect to the network of your local Operating system.

When it is connected you will find the symbol as in the following image.

As in the above screenshot if it shows the highlighted symbol, it indicates the cloudera VM is able to connect to the network.

Please feel free to revert if you need any further help.