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How do I change the MAC address after flashing PDF Print E-mail
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Written by Shawn   
Sunday, 12 November 2006
1) reset to factory defaults a) administration>factory defaults, or b) hold reset button for 30 seconds
2) telnet 192.168.1.1 default username is root, default password is admin

or

2a) go to administration>commands

3) enter these commands:

nvram set et0macaddr=(mac on bottom of router)
nvram set il0macaddr=(mac on bottom of router + 1)
nvram commit

note: replace the mac address in the 1st line with the mac address that's stamped on the bottom of your router... for the 2nd line, increase the last number by 1 but keep the rest the same.

4) exit telnet or exit the admin page and wait 5 minutes

5) reload the config page (192.168.1.1 and look for your mac address. it should be there. if its not, unplug the router, wait a minute, plug it in, wait a few minutes, and reload the page. it should be there.

Also you should note that everytime you do a hard reset on the router (the reset button on the back for 30 seconds) you will have to redo these settings.
Comments
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Mike - Lowly Techie From:12.219.93.xxx | 2006-11-16 19:43:15
I did these steps and it worked but, you could make it clearer by using a slightly clearer example and stating that all three lines are to be done together.

So instead of:

nvram set et0macaddr=(mac on bottom of router)
nvram set il0macaddr=(mac on bottom of router + 1)
nvram commit

How about:

nvram set et0macaddr=00:18:B8:E2:B9:4C
nvram set il0macaddr=00:18:B8:E2:B9:4D
nvram commit

Also, how do you change the wireless MAC because people may need to change that as well?
Reply | Quote
jun101 From:203.84.180.xxx | 2007-06-21 09:24:09
Is this applicable to speedstream 6520? thanks.
Reply | Quote
admin Super Administrator | 2006-11-18 16:12:45
avatar The wireless MAC is derrived from these two MAC addys. I suppose I could put that, but then there would be a lot of people with WRTs with macs of 00:18:B8:E2:B9:4C, 00:18:B8:E2:B9:4D, and 00:18:B8:E2:B9:4E

Shawn
Reply | Quote
emery800 - Over the hill Tech Registered | 2006-11-27 17:34:18
You have done some great posting! Good Job! :>)
Reply | Quote
Michael - UNIX Geek From:65.8.122.xxx | 2006-11-29 18:12:30
That's what I did after converting a v6. It bricked on me. Not to worry, the processor's copy of the original nvram debricked it. I'm not sure how this happened but it actually made my heart stop for a moment.

Any ideas???
Reply | Quote
Sean - -biomed From:69.179.248.xxx | 2006-11-30 20:34:39
so if i were to change all three mac's how would i do that. i see how to change two of them but before i flashed my linksys router i wrote down all three mac's and i want to change them back to the original.
Reply | Quote
Harald - Permanently change the mac add From:84.27.57.xxx | 2007-03-18 08:07:54
I accidently made a typo in the MAC address when installing DD-WRT and want to change it to the right address permanently. How can I achieve this?
I tried reverting back to VXworks and then reinstalling DD-WRT, but can't get the reversion process to work.
Reply | Quote
zardiw From:71.102.66.xxx | 2007-05-12 19:22:30
It should set the wireless one automatically, but if you want to hardwire it, it's

nvram set wl0_hwaddr=00:XX:XX:XX:XX


z
Reply | Quote
zardiw From:71.102.66.xxx | 2007-05-12 19:24:09
Just a reminder for everybody....use IE if you're having problems setting it up with other browsers. I had to use IEv6....Don't know about v7....heard it's brain dead...lol..........z
Reply | Quote
zardiw From:71.102.66.xxx | 2007-05-12 19:26:37
PS. The wireless MAC is one greater than the il0 one. So for mine, they end in :

et0 - D6
il0 -D7
wl0 - D8

z
Reply | Quote
Matt From:12.168.239.xxx | 2009-06-19 16:15:01
I had the same problem - I had to put it into 0000000 format. Just numbers (000000000000) or hyphens (00-00-00-00-00-00) DOES NOT WORK!!!
Reply | Quote
Billy_McBong From:75.198.156.xxx | 2007-12-09 17:31:39
i did this and now i cannot connect to router at all, i cant even ping it.
any advice?
Reply | Quote
drpepperONE From:151.47.144.xxx | 2007-12-29 09:19:05
Hi i did these command on la FONERA with last DD-WRT rc6.1 firmware but the wireless mac address never change!!!
If try to cennet to my fonera via wirelless the mac address shown is the default original + 1!!
I think it's inpossible toi change!!!

Ohh my god!!!

nvram set et0macaddr=001234:2C
nvram set lan_hwaddr=001234:2C
nvram set il0macaddr=001234:2D
nvram set ath0_hwaddr=001234:2D
nvram set wl0_hwaddr=001234:2D
nvram commit
Reply | Quote
salocin - linux mac address versus links From:74.129.146.xxx | 2008-01-08 21:36:47
Why does Linux change the mac address? For some reason when I connect my wrt54g v5 flashed with dd-wrt micro generic v23 sp2 it doesn't like the new linex mac address. But when I set the mac address supplied by linksys via command shell the router works like a charm. Please help me understand
Reply | Quote
admin Super Administrator | 2008-01-26 16:30:32
avatar When you flash to DD-WRT on a V6 the vxworks killer bin contains a generic mac address. With the generic mac address you might have problem with compatability. It would be beneficial to use the address supplied by Linksys as it is unique and no other network device on the planet has the same MAC.
Reply | Quote
Marcus - Is this possible??? From:69.115.92.xxx | 2008-01-29 17:05:11
I accidently made a typo in the MAC address when installing DD-WRT and want to change it to the right address permanently. How can I achieve this?
I tried reverting back to VXworks and then reinstalling DD-WRT, but can't get the reversion process to work.
Reply | Quote
Foolbar - Fool From:209.152.81.xxx | 2008-01-30 22:57:59
Setting the MAC properly:

Administration -> Commands

nvram set et0macaddr=(MAC on bottom of router - 1)
nvram set il0macaddr=(MAC on bottom of router)
nvram commit

Save Startup
Reboot

I checked this with the switch upstream.
et0macaddr is the MAC address of the router
when viewed from inside the LAN.

il0macaddr is the MAC address when viewed
from the WAN side.

The documentation that I found here and
elsewhere had them switched.

You can also confirm this by looking at
the router's status and setup pages.
Reply | Quote
Foolbar - Foo From:209.152.81.xxx | 2008-01-30 23:46:32
[color=red]You can also confirm this by looking at
the router's status and setup pages.[/color]

You can also confirm this by looking at
the router's Status/Router and Status/Sys-Info pages.
Reply | Quote
Craig - remember to delete your arp ta From:81.178.20.xxx | 2008-09-13 16:14:40
after you have changed the mac address you need to delete the stale arp table to reconnect to it. On your client machine run arp -d 192.168.1.1 (unless you changed the default IP)
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