Ifconfig
From Tassadar
Ifconfig is the command-line tool that every Windows admin wishes he had. You can both check and set your IP address quickly, which makes it one of my favorite programs.
ifconfig -a // displays your current network information
ifconfig e0a 192.168.1.9 netmask 255.255.255.0 // sets interface e0a to the specified network settings
It's important to note that the default gateway is not present in the NIC config, rather it's done through the route command.
