Network

Interfaces

interface

ifconfig

ifup <if_name>
ifup eth0

ifdown <if_name>
ifdown eth0

ifquery -l

For more infos see the nmap page

Find open ports on a ip subnet range

nmap

# Finding ssh server in ip range 192.168.0-192.168.0.255
nmap -p 22 --open 192.168.1.0/24

Finding a machine on your local subnet using DHCP.

arp-scan

# Finding ssh server in ip range 192.168.0-192.168.0.255
sudo apr-scan --interface=eth0 --localnet | grep aa:bb:cc:dd:ee:ff