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From: Mick <michaelkintzios@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] [OT] network discovery tools
Date: Thu, 26 May 2011 20:04:33 +0100
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On Thursday 26 May 2011 17:24:05 Florian Philipp wrote:
> Am 25.05.2011 21:45, schrieb Harry Putnam:
> > There must be a number of people who post here that have had to do
> > this problem.
> >=20
> > Discover the addresses of computers on a home network that have
> > connected by way of DHCP. For example: Several wireless connections.
> >=20
> > I've used static IPS for around 10 yrs, always seemed handier for
> > things like ssh between home lan computers.
> >=20
> > But recently started using DHCP for wireless connections. It must be
> > such a popular method for some reason.
> >=20
> > But when you do it that way, and say want to VNC or ssh or the like to
> > something connected by a dhcp serving WAP then how do you find the
> > address?
> >=20
> > That is, besides something like accessing the WAP and checking the IPs
> > connected to it.
> >=20
> > Is there some quick and sure way to discover any IPs on the home lan?
> >=20
> > Some kind of mapper tool?
>=20
> While I personally prefer a combined DHCP+DNS server like dnsmasq, you
> can also take a look at the whole Zeroconf/MDNS/Avahi/Bonjour stack.
>=20
> I'm not really sure if you can configure common devices and Linux PCs to
> use the DNS server for internet addresses and MDNS for local ones. In
> theory, it should be possible since you can distinguish them (local
> addresses should not be fully qualified _or_ have the domain .local).
>=20
> net-misc/mDNSResponder, sys-auth/nss-mdns and net-dns/avahi are probably
> good starting points.
netdiscover seems to do exactly what the OP asked for, although I have used=
=20
arping and a couple of scripts I found on the net and modified them.
The first looks like this:
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D
#!/usr/bin/env bash
quit_on_found=3D0
packet_count=3D2
subnet=3D""
verbose=3D"-q"
usage()
{
cat << EOF
find_ip 1.0 Robin Wood (dninja@gmail.com) (www.digininja.org)
=46ind used and unused IPs on a network you don't haven an IP address on
usage: $0 options
OPTIONS:
-h Show this message
-c <packet count> The number of ping packets to send, default 2
-s <subnet> First 3 parts of the subnet to test, default=20
192.168.0
-q Quit when found first free address, default keep=
=20
going
-v Verbose
EOF
}
have_arping=3D`which arping`
if [[ "$have_arping" =3D=3D "" ]]
then
cat << EOF
usage: $0 options
You must have arping installed and in the current path for this scanner to=
=20
work
EOF
exit 1
fi
while getopts ":hvs:qc:" flag
do
case $flag in
h)
usage
exit 1
;;
c)
packet_count=3D$OPTARG
;;
q)
quit_on_found=3D1
;;
s)
subnet=3D$OPTARG
;;
v)
verbose=3D""
;;
?)
usage
exit 1
;;
esac
done
if [[ "$subnet" =3D=3D "" ]]
then
cat << EOF
usage: $0 options
You must provide a subnet
EOF
exit 1
fi
if [[ "$verbose" =3D=3D "" ]]
then
if [[ $quit_on_found =3D=3D 1 ]]
then
echo "Quiting when found a free address"
fi
echo "Testing subnet $subnet.0/24"
echo "Sending $packet_count packets per IP"
fi
for i in {1..254}
do
IP=3D$subnet.$i
arping $verbose -c $packet_count $IP
result=3D$?
if [[ $result =3D=3D 0 ]]
then
echo "$IP Used"
else
echo "$IP Free"
if [[ $quit_on_found =3D=3D 1 ]]
then
exit
fi
fi
done
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D
Google for "find_ip.sh"
The other which I can't find at the moment prints out the MAC address of ea=
ch=20
IP address that is in use. Alternatively, run the above script with the -v=
=20
option and then scroll back to look at the MAC addresses.
Of course, I was using this before I knew that netdiscover existed - thanks=
=20
for sharing!
=2D-=20
Regards,
Mick
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