Nload allows you to view your current network bandwidth activity for both incoming and outgoing connections, live as it happens.
For Ubuntu use the following command:
apt-get install nload
For Centos use the following command
yum install epel-release yum install nload
To access nload just type in:
You can use the left and right keys on your keyboard to switch between different network cards. Alternatively, you can use the command below to view all your network activity