[usuario@maquina ~] ifconfig
eth0      Link encap:Ethernet  HWaddr 00:11:2F:91:24:37  
          inet addr:192.168.20.133  Bcast:192.168.20.255  Mask:255.255.255.0
          UP BROADCAST NOTRAILERS RUNNING MULTICAST  MTU:1492  Metric:1
          ...