[ILUG] IP address from ethernet address

[Scanlan, Brian (5188)]

Warning: I don't know networking stuff. :)
These are all off the top of my head and untested.
Intresting problem, though.

Use tcpdump, reboot the Windows 2000 box, and watch
it say hello to the network, rob the IP from there? 
I've no idea will it say hello to the network, but it 
might do something like load a SMB share. Randomly saying hello
to the network sounds like something a Windows box would do...
"Hi! I'm a Windows box - Any other out there?"

Else, change your Ethernet address to his (you can do that from
the OK prompt), and ping
your machine from a third party (making sure
the arp entry on the third party is the one for both machines). 
Watch the fun using tcpdump. IIRC, Solaris will complain about
somebody else using their ethernet address, giving away the IP 
in the error messages, and sure you'll have that from tcpdump anyway.

Else... 
echo 0 | nc 255.255.255.255 6   
Does Win2k echo echo requests - tcpdump the network at this time...

Or maybe watch the response from
nmap -sP '10.0.0.*'

Should be in the arp cache then. If not, tcpdump the nmap scan and
grep for ethernet address.

Brian.
-----Original Message-----
From: Miles [mailto:kieran.colfer at ireland.sun.com]
Sent: 21 November 2000 18:55
To: ILUG
Subject: [ILUG] IP address from ethernet address


Does anyone know how to figure out the hostname/IP address of a machine
from its ethernet address on a solaris network? I have a box here that's
useless to me (win2k professional, don't have any passwords, guy who has
went to india for 2 months), and I want to use its IP address and
hostname on a Suse 6.4 laptop I have here. Unfortunately, seeing as it's
win2k, I don't get the handy "welcome to <hostname>" message at the
login screen, and I can't get in to find out. All I have is the ethernet
address from the back of the machine. Any ideas? I know how to get the
ethernet address from the hostname, but not the other way around. 

		...Miles

kieran.colfer at ireland.sun.com

comment:
	A superfluous element of a source program included so the
	programmer can remember what the hell it was he was doing
	six months later.  Only the weak-minded need them, according
	to those who think they aren't.

-- 
Irish Linux Users' Group: ilug at linux.ie
http://www.linux.ie/mailman/listinfo/ilug for (un)subscription information.
List maintainer: listmaster at linux.ie