Changing Mac Address on Network Card?

neopiper · 01-29-2004, 10:45 PM

I'm running Libranet 2.8.1, really happy with it, however i need to change my Network card MAC address in order to connect to the campus network as my old laptop was registered under a different mac address.

Is there a way to change et0's mac address? especially in libranet?

Thanks in advanced.

hexbit · 01-29-2004, 11:05 PM

As root, try this (assuming your nic is eth0) :

# /sbin/ifconfig eth0 down
# /sbin/ifconfig eth0 hw ether 00:00:00:00:00:00
# /sbin/ifconfig eth0 up

Just replace the 00:00:00:00:00:00 w/whatever you need.

=)

Quote:

Originally posted by neopiper
I'm running Libranet 2.8.1, really happy with it, however i need to change my Network card MAC address in order to connect to the campus network as my old laptop was registered under a different mac address.

Is there a way to change et0's mac address? especially in libranet?

Thanks in advanced.

neopiper · 01-29-2004, 11:20 PM

great it works, how can i make it default during init and boot up?

King Richard · 01-30-2004, 12:27 AM

Um, I am probably going to sound like a dork, but I was under the impression that a MAC address was permanently burned into a card, and to prevent there from ever being two cards with the same MAC address, had a unique code not only identifying the specific card but also identifying the card manufacturer.

stickman · 01-30-2004, 08:00 AM

Yes, each NIC manufacturer is supposed to assign a unique MAC address to their NICs; however, it has been known that occasionally that they accidentally make dupes. There are instances (like system failover) where you do want to have a NIC changes its MAC address.

neopiper · 01-30-2004, 12:00 PM

so any idea how i can change it and apply to it automatically during boot up?

thx

PlatinumRik · 02-26-2004, 01:54 PM

there are two mac addresses, a software mac address and a hardware mac address

dubman · 02-26-2004, 08:09 PM

a MAC address i just some PHY registers in the EEPROM. These values can be easily changed if the kernel has a method to access these registers. Basically, you can spoof your MAC to be whatever you want it to be.

The PHY is going to reset each time you power cycle, so you will need to create a shell script to make the changes and place the script in your /etc/rc.local. This way the changes will be made upon boot, after all other services have been initialized.

--Hope this helps

Shantesh · 06-28-2004, 10:43 PM

tht ifconfig thing worked...cool...now i can access my frds account whuz not in town

m_yates · 07-06-2004, 02:36 PM

neopiper, this is a late reply, but I know how you can make it automatic at boot up. Edit the file /etc/rcS.d/S40networking. Scroll down until you see:

Quote:

echo -n "Configuring network interfaces: "
ifup -a
echo "done."

Add your commands above "ifup -a" so that the mac address is changed before the eth0 card is brought up

Quote:

echo -n "Configuring network interfaces: "
ifconfig eth0 down
ifconfig eth0 hw ether 00:00:00:00:00:00 up
ifup -a
echo "done."

Of course the zeros above should be your desired mac address.

Fond_of_Opensource · 11-21-2007, 02:14 AM

I have Redhat 9 machine.

I changed MaC address to 11:22:33:44:55 using ifconfig.

Now, I can ping to other hosts on my network and also to google.com

But when I try to open www.google.com in the Mozilla browser, I get Error as "The operation timed out when attempting to cotact www.google.com"

Please help how to solve this problem.