Linux networking commands

Displaying IP address of an interface
# ifconfig eth0

Setting up IP address using ifconfig
# ifconfig eth0 192.168.1.5 netmask 255.255.255.0 up

To up and down an ethernet device

# ifup eth0
# ifdown eth0

Showing status of ethernet interface eth0

# ethtool eth0

Showing status of wireless interface eth1

# iwconfig eth1

Listing network interfaces

# ip link show

List internet services on a system

# netstat -tupl

List active connections to/from system

#  netstat -tup