See devices connected to your network
sudo apt-get install nmap
Get IP range of the network with ifconfig command. Look for wlan0 if you are using wifi or eth0 if you are using Ethernet.
user@user-notebook:~$ ifconfig
wlan0 Link encap:Ethernet HWaddr 70:f1:a1:c2:f2:e9
inet addr:192.168.1.91 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::73f1:a1ef:fec2:f2e8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2135051 errors:0 dropped:0 overruns:0 frame:0
TX packets:2013773 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1434994913 (1.4 GB) TX bytes:636207445 (636.2 MB)
The important things are highlighted in bold. Here IP is
192.168.1.91 and the subnet mask is 255.255.255.0 which means that the ip address range on the network varies
from 192.168.1.0 to 192.168.1.255.
It is advisable to use root privileges while scanning the network for more accurate information. Use the nmap command in following way:
sudo nmap -sP 192.168.1.0/24
Starting Nmap 5.21 ( http://nmap.org ) at 2012-09-01 21:59 CEST
Nmap scan report for neufbox (192.168.1.1)
Host is up (0.012s latency).
MAC Address: E0:A1:D5:72:5A:5C (Unknown)
Nmap scan report for takshak-bambi (192.168.1.91)
Host is up.
Nmap scan report for android-95b23f67te05e1c8 (192.168.1.93)
Host is up (0.36s latency).
Here there are three devices connected to a network.
~SOURCE!~
A GUI free program: WifiGuard
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