Spoof Mac in Mac

A MAC address is a unique identifier assigned to your network card, and some networks implement MAC address filtering as a method of security. Spoofing a MAC address can be desired for multiple reasons, and it is very easy to spoof your MAC address in both Mac OS X 10.4 and 10.5. For the purpose of this article, we are going to assume you want to spoof your Mac’s wireless MAC address. So without further ado, here’s a 3 step process on how to do it:

Retrieving your current MAC address

First, you’re going to want your current wireless MAC address so you can set it back without rebooting. Launch the Terminal and type the following command:
ifconfig en1 | grep ether
You’ll know see something like:
ether 00:12:cb:c6:24:e2
And the values after ‘ether’ makeup your current MAC address. Write this down somewhere so you don’t forget it. If you do, it’s not the end of the world, you’ll just have to reboot to reset it from a change.

Spoofing a MAC address

To spoof your MAC address, you simply set that value returned from ifconfig to another hex value in the format of aa:bb:cc:dd:ee:ff

For this example, we will set our wireless MAC address to 00:e2:e3:e4:e5:e6 by issuing the following command:
sudo ifconfig en1 ether 00:e2:e3:e4:e5:e6

The sudo command will require that you enter your root password to make the change.

Verifying the Spoofed MAC address worked

If you want to check that the spoof worked, type the same command as earlier:
ifconfig en1 | grep ether
Now you will see:
ether 00:e2:e3:e4:e5:e6
Meaning your MAC address is now the value you set it to. If you want to further verify the spoof, simply login to your wireless router and look at the ‘available devices’ (or attached devices) list, and your spoofed MAC address will be part of that list.

If you want to set your MAC address back to its real value, simply issue the above ifconfig commands with the MAC address that you retrieved in step 1. You can also reboot your Mac.

Enjoy!

Note: Reader Dee Brown points out the following, which may help with some users having difficulties: “running 10.5.6 you need to do the trick to disassociate from the network. ****DO NOT TURN AIRPORT OFF****. What you will have to do is click your airport and click join network and enter some bogus name as the network ssid. Then while it’s trying to connect click cancel.At this point you may spoof using the sudo ifconfig en1 ether command”

other reads point out that Dee Brown’s trick works in 10.5.7 and above too. Thanks Dee!

Update: If you’re still having problems with MAC address spoofing in Leopard or Snow Leopard, the above method still works but try disassociating with any wireless network BUT keep your wireless Airport on (as mentioned above) – an easy way to do this is to type the following in the command line:

airport -z

Note that you have to have the ‘airport’ command setup to work for users, you can do that by copy and pasting this command into the Mac Terminal:

sudo ln -s /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport /usr/sbin/airport

Once disassociated from the network you should be able to spoof your MAC address as usual

[Copied from http://osxdaily.com/2008/01/17/how-to-spoof-your-mac-address-in-mac-os-x/]

Invisible Nmap

Nmap is a powerful tool for network scanning. Whether it is good or bad is a different question and that is upto the users' motives to use it. It has a lot of options. Here are some of those options together to get a reasonable amount of information about an ip or network without bothering the owner by telling her about your existence :). Not sure though how efficient it would be considering the latest IDS/IPSes. But that's all I could get out of the options provided by NMAP. The command and its explanation are as follows:

sudo nmap -n -sS -f -A -T1 -S fake_ip -e interface_to_use -D fake_ip1, fake_ip2, fake_ip3 -vvv ip_to_scan -P0

Sudo: You have to have root permission to run it.
-n: Do not resolve host. Show the ips.
-sS: Stealth SYN scan. SUpposed to be less noisy.
-f: fragment the packets before sending to the ip_to_scan. Reduces the chance to get detected. New IDS/IPS can get it still (as per the information I got).
-A : Do OS and version detection, script scanning, and traceroute.
-T1 : Range is T0 (slowest) to T5 (fastest) -speed of execution. Slower packet sending increases your anonymity.
-S fake_ip: Use fake_ip as the source of the packets.
-e interface_to_use: Since source address is spoofed in precious option, you have to give the network interface details to send/receive packets.
D fake_ip1..ME : Decoy option - Use all these fake_ips mentioned and ME, i.e. my ip to create packets to send. More invisibility.
-vvv: very very verbose mode. Explains the output more elaborately.
ip_to_scan: IP/Network to scan.
-P0: Do not ping , do only scan. Saves time and finds more machines.