One of the most popular networking command in Linux is the ifconfig command. It lets you see (and configure) IP address for network interface. It also shows the MAC address for each interface. The MAC address and the IP address viewing is probably the most common reason for using the ifconfig command. In addition the ifconfig command works with physical network interface (like eth0..) and virtual network interface (like Tap interface etc).
In the next installment of “What I learnt today” or WILT, I briefly touch upon Network Namespace. I came across Namespace as part of my ongoing study of OpenStack networking. Namespaces are powerful constructs in Linux that allows you to create a copy of the TCP/IP network stack -all the way from the Ethernet interfaces (L2), routing tables etc.