network

elishac · 06-20-2011, 01:52 PM

hello,
what's the easiest way (in, let's say, ubuntu) to be notified when someone (besides me) starts using my wireless network ?
A script can be written if necessary.

Thanks.

lisle2011 · 06-20-2011, 02:27 PM

The only way I know is to login as admin to the wireless hub and open the page that shows you the machines using the network.

There may be other ways but this is what I would do.

Vlinux6 · 06-20-2011, 03:51 PM

You could also use nmap. Run (or write a script to run): nmap <ip-address-of-router>/24
That should scan all devices on your network. You could then expand the script to filter the output as desired.

elishac · 06-20-2011, 04:03 PM

Could you be a little bit more precise please, I'm familiar with neither nmap nor scripting in general.
Would it be something like:
while 1
$s=nmap -sn 192.168.0.1/24
if $s != "" then return true
WEnd

elishac · 06-21-2011, 01:08 AM

Can someone with better scripting skills help me ?
Thanks

elishac · 06-21-2011, 11:05 AM

It doesn't have to be ubuntu by the way, in case it's much easier in another distro

lisle2011 · 06-21-2011, 11:52 AM

Vlinux6 gave you the answer. You can make it a cron job if you want that's easy, not much to know about cron.

type "nmap -v -A <ip address range>/24

i.e nmap -v -A 192.168.0.254/24

You will get plenty of interesting information.

If Vlinux6 answer confused you go learn some bash,

elishac · 06-21-2011, 12:42 PM

I have some really basic understanding of bash which allows me to understand the general meaning of a script, but I'm not good enough to do it alone just yet, which is why I came here for help.
How could I filter the nmap output ?

Thanks

chrism01 · 06-21-2011, 06:10 PM

The best way to learn bash is to play with it.
Here are some good links
http://rute.2038bug.com/index.html.gz
http://tldp.org/LDP/Bash-Beginners-G...tml/index.html
http://www.tldp.org/LDP/abs/html/