Solved

How to change MAC address of LAN adapter ?

Posted on 2000-03-09
11
866 Views
Last Modified: 2008-03-04
Is there any way to do that?
If yes please explain how. I use 3COM Etherlink 10/100 PCI (3C905B-TX) adapter.
Also is it a common practice to log what has been done from which MAC address?

thanx
0
Comment
Question by:levx
11 Comments
 
LVL 12

Expert Comment

by:pjknibbs
ID: 2599615
No, you can't change the MAC address of an Ethernet adapter. This is a hard-coded number which the manufacturer guarantees to be unique, so no two adapters will have the same MAC address: this guarantee wouldn't be worth much if you could change it!
0
 
LVL 32

Expert Comment

by:jhance
ID: 2599921
>Also is it a common practice to log
>what has been done from which MAC
>address?

Did you do something you shouldn't have?

0
 
LVL 1

Expert Comment

by:hdevaux
ID: 2600123
MAC adress can't be changed BUT you can use LAA (Locally Administered Adress).It's a feature on token ring card but also on ethernet (ithink). This adress will be used instead of MAC on the network so you must check that no other network cards as this adress.
You can change LAA on 3COM card with drivers (depending on version) or with a program (downloadable from 3COM web site) named something like 3C5x9CFG.

Hope this would help
Bye
0
Migrating Your Company's PCs

To keep pace with competitors, businesses must keep employees productive, and that means providing them with the latest technology. This document provides the tips and tricks you need to help you migrate an outdated PC fleet to new desktops, laptops, and tablets.

 
LVL 12

Expert Comment

by:j2
ID: 2600409
hdevaux: Thats a Tokenring-only feature.

as far as i know there is no way to change the MAC of anything (well, you can do it on SUN workstation, with a lot of trickery) ANd i hope you cant. Imaging the chaos that would result.
0
 
LVL 32

Expert Comment

by:jhance
ID: 2600521
In general, it's not possible to change the MAC address of an Ethernet card.  In most cases it's stored in programmable memory on the card.

Some systems, like the Sun, save it in system configuration memory and it can be changed.  On some network cards there is a separate PROM chip that can be removed and replaced.  On others, like the newer 3COM board you have, the MAC is stored in the controller chip and there is not a documented way of modifying it.
0
 
LVL 12

Expert Comment

by:j2
ID: 2600529
Just a comment.. The real reson for being able to change the MAC of suns is because the MAC is used in the "fingerprint" of the machine and some software packages (such as microstation) uses this fingerprint for licencing.
0
 
LVL 32

Expert Comment

by:jhance
ID: 2600594
j2,

Actually Suns also have a "hostid" which is not stored in the CMOS RAM on the motherboard but is stored on a PROM chip.  If you have your Sun box serviced and it requires a motherboard swap, the service technician is supposed to move the ID PROM from the old motherboard to the new one so that any licensed software will continue to be licensed.

I know that some companies tie their licenses to the MAC address but this is a foolish practice since:

1) It's easily changed on some SUN models.

2) It's not always constant.  Some Sun's have SBus Ethernet cards and these can be changed.

3) There may be more than one network card, and hence more than one MAC in a given system.
0
 
LVL 63

Expert Comment

by:SysExpert
ID: 2601156
I seem to remember that some NIC's had a utility that allowed changing the MAC address. If you do not have it on your driver disks, check out the manufacturers site. This was popular during the NE2000 clone days especially.  I hope this helps.
0
 

Accepted Solution

by:
cooljudson earned 200 total points
ID: 2602030
You cannot change the MAC address of a network device.  These numbers are "burnt" into the device at the factory and are not changeable.  Networks are not able to function with 2 devices using the same MAC address.  This keeps you from changing your MAC address to someone else's address and getting them in trouble by hacking into someone's network.  The MAC address is a serial number and security mechanism.  Don't know why you would want to try, but just can't be done...
0
 
LVL 12

Expert Comment

by:j2
ID: 2602042
cool: it can som some devices. there are perfectly legit reasons.. but that discussion isnt really relevant.
0
 

Author Comment

by:levx
ID: 2602250
well,looks like it really can't be done:(
0

Featured Post

U.S. Department of Agriculture and Acronis Access

With the new era of mobile computing, smartphones and tablets, wireless communications and cloud services, the USDA sought to take advantage of a mobilized workforce and the blurring lines between personal and corporate computing resources.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
HP BIOS Application Error (501) shows up at booting 67 131
best recommendation for a hardware diagnostic tool 7 95
M.2 drives 6 54
1TB SSD INTERMITTENTLY INVISIBLE 3 58
Every server (virtual or physical) needs a console: and the console can be provided through hardware directly connected, software for remote connections, local connections, through a KVM, etc. This document explains the different types of consol…
Moving your enterprise fax infrastructure from in-house fax machines and servers to the cloud makes sense — from both an efficiency and productivity standpoint. But does migrating to a cloud fax solution mean you will no longer be able to send or re…
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

860 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question