Victor J. Canny D.
Abstract: Mac address can uniquely identifies each node of a network,
ISPs and network administrators use mac address to manage their pc users. PC
users may want to
spoof mac address so that he need not to contact with ISP for
a new network interface card (NIC); PC users may want to hide his mac address so
that totally hide his information on the internet.
Introduction
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Mac address, short for Media Access Control
address, is a hardware address that uniquely
identifies each node of a network.
It means, in a local area network (LAN) or other network, the
MAC (Media Access Control) address is your computer's unique NIC
number. (On an Ethernet LAN, it's the same as your Ethernet
address.) When you browser the Internet with your computer (or
host as the Internet protocol thinks of it), a correspondence
table relates your IP address to your computer's mac address on
the LAN. This table often organized by your computer's router or
your ISPs.
The MAC address is used by the Media Access Control sublayer
of the Data-Link Layer (DLC) of telecommunication protocols.
There is a different MAC sublayer for each physical device type.
The other sublayer level in the DLC layer is the Logical Link
Control sublayer.
Mac address is a physical address of nics, it is not easy to
be spoofed. However,
Spoofing mac address could be useful to:
- You don't blow your time
calling the ISP and ask them to update the
registered MACaddress to match the new
hardware. Some Cable Modem ISP's
assign IP addresses base on the PC's MAC
addresses. For whatever reason, if you need
to swap 2 PC's regularly to connect to the
cable modem, it would be a lot easier to
change MACaddresses rather than to change
Network Interface Card (NIC).
- You can scan the MacAddress of
destination computer.
- You can perform security checking on MAC
Address based authentication and
authorization systems
- You can build Stand-by (offline)
systems with the EXACT same CompterName, IP,
and MACADDRESSES as the Primary Systems. If
Stand-by systems should be put online, NO
arp table refresh is necessary, which
eliminates extra downtime.
- Test network management tools .
- Some software can ONLY be installed and
run on the systems with pre-defined MAC
address in the license file. Now you can
install one of these applications to another
system with a different NIC.
- Troubleshoot Network problems. Arp
Tables, Routering, Switching,...
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This paper will propose methods of spoofing mac address.
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1
Automatic spoofing mac address under win95/98/nt/2000/2003/xp
A much easier method to change MAC
address under Windows is to use the
a-mac address
change utility.
It based MAC address that is interpreted by the network adapter
device driver, which eventually pass to Windows operating system.
By using
a-mac utility,
you can:
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spoof
Mac Address As Easy As
1-2-3! Three Steps And You're Done! Here's All The "Technical"
Stuff You Need To Know...
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 Step
#1 Is So Easy...
Select the
Ethernet networks cards which you want to change
MacAddress. |
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Then,
There's Step #2...
Input the new
MacAddress |
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And
Finally, Step #3...
Click "change to"
button, OK!!! |
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2 Troubleshooting of spoofing mac address by
a-mac address
change
2.1 Not
getting the new MAC address just updated?
2.2 Still having problem after I choose right
mac address
You ISPs
or router may demand for special mac address or special mac address-ip
combination. At this time, you can use
a-mac address
change to scan mac address first, then use
the scanned mac address-ip combination to
spoof a new mac address. Make sure there is no two computer with same mac
address-ip combination active together, other there may be network problem.
Some time you can
visit http://www.whatismyip.com to find
your true IP, which can help you to scan mac address of your local network.
3 Conclusion
a-mac address
change works good on all windows system and
better meeting the using of spoofing mac address.
Reference:
1. A-mac address change,
http://amac.paqtool.com
2. What is mac address?,
http://www.webopedia.com/TERM/M/MAC_address.html
3. Wireless lan mac address spoofing,
http://seclists.org/lists/bugtraq/2003/Jan/0195.html
4. change my mac address software, http://amac.paqtool.com
5
find a computer
with the mac address.