LinuxQuestions.org
Help answer threads with 0 replies.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Networking
User Name
Password
Linux - Networking This forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.

Notices

Reply
 
Search this Thread
Old 01-05-2007, 10:51 PM   #1
lothario
Member
 
Registered: Apr 2004
Posts: 340

Rep: Reputation: 30
"...Device eth0 has different MAC address than expected,.."


I had to setup 3 identical Fedora Core 4 systems for a custom application training session.
All 3 machines have identical hardware.

So I got the first machine configured as per the requirements.
Then I used "Ghost for Linux" to make an image of this PC on a ftp server.
I used the "Ghost for Linux" boot CD to put the same image on the 2nd machine.

Machines 1 and 2 are DHCP clients and they are working pretty much as expected.

But ONLY on the 2nd machine, I keep getting this warning (on the console) when I reboot:
Quote:
"Shutting down interface eth0: Device eth0 has different MAC address than expected, ignoring."
Ok, yes the mac address of the 1st machine was inherited by the 2nd machine via the ghost imaging.
And it is being ignored. But I would like to fix this warning.

How do I fix eth0 on the 2nd machine so that the inherited MAC address goes away
and therefore the above warning goes away?
 
Old 01-06-2007, 12:40 AM   #2
jonwatson
Member
 
Registered: Jun 2004
Location: Nova Scotia, Canada!
Distribution: Ubuntu
Posts: 170

Rep: Reputation: 30
On a Debian machine I would investigate the /etc/iftab file. I'm not sure if this is the same file on a FC machine, but it might point you in the right direction.
 
Old 01-06-2007, 06:16 AM   #3
lothario
Member
 
Registered: Apr 2004
Posts: 340

Original Poster
Rep: Reputation: 30
Thanks for the tip.
It helped me find the right file to edit:

/etc/sysconfig/network-scripts/ifcfg-eth0

Just updated the HWADDR value and rebooted the system.
Problem solved.
 
Old 01-06-2007, 12:14 PM   #4
jonwatson
Member
 
Registered: Jun 2004
Location: Nova Scotia, Canada!
Distribution: Ubuntu
Posts: 170

Rep: Reputation: 30
Good to know, thanks!
 
Old 02-25-2010, 03:55 PM   #5
IonutIonescu
LQ Newbie
 
Registered: Feb 2010
Posts: 4

Rep: Reputation: 0
Thumbs up thanks, just the ticket

had similar problem with RedHat RHEL5.4 on and old Toshiba laptop.
Edited the file and it worked.
 
Old 03-18-2013, 06:06 PM   #6
montego
LQ Newbie
 
Registered: Mar 2013
Posts: 1

Rep: Reputation: Disabled
I have the same problem.
When I try to change MAC with the following commands:

ifconfig eth0 down
ifconfig eth0 hw ether aa:bb:cc:dd:ee
ifconfig eth0 up


after service network restart it gives me the error: Device eth0 has different MAC address than expected, ignoring.

I also tried to update /etc/sysconfig/network-scripts/ifcfg-eth0, but after the restart nothing happens, the new MAC has no effect.

Is there another way to do it?

P.S. I am using Centos 6.4.

Last edited by montego; 03-18-2013 at 06:14 PM.
 
Old 05-13-2014, 06:59 AM   #7
abdulhameedom
LQ Newbie
 
Registered: May 2014
Posts: 9

Rep: Reputation: Disabled
Question

Quote:
Originally Posted by lothario View Post
Thanks for the tip.
It helped me find the right file to edit:

/etc/sysconfig/network-scripts/ifcfg-eth0

Just updated the HWADDR value and rebooted the system.
Problem solved.

Kindly advice me what is HWADDR value,, i found 00:0C:29:53:7A:AE . now what i have to update ,, you mean a new value ?? what it might be.. pls i am new one for linux pls help me to understand

Regards
 
Old 05-13-2014, 08:43 AM   #8
TenTenths
Senior Member
 
Registered: Aug 2011
Location: Dublin
Distribution: Centos 5 / 6
Posts: 1,470

Rep: Reputation: 438Reputation: 438Reputation: 438Reputation: 438Reputation: 438
Quote:
Originally Posted by abdulhameedom View Post
Kindly advice me what is HWADDR value,, i found 00:0C:29:53:7A:AE . now what i have to update ,, you mean a new value ?? what it might be.. pls i am new one for linux pls help me to understand

Regards
The value will depend on the actual MAC that's coded on to the network card. If you only have one network card on a system you can usually delete the HWADDR line as your only network card will be eth0.

If you have multiple NICs in your server then the HWADDR line is essential so that networking has a physical to "logical" mapping.

You could also try
Code:
ifconfig -a
to show the HWaddr of the various NICs in your system.

Last edited by TenTenths; 05-13-2014 at 08:46 AM.
 
Old 05-13-2014, 02:18 PM   #9
abdulhameedom
LQ Newbie
 
Registered: May 2014
Posts: 9

Rep: Reputation: Disabled
Quote:
Originally Posted by TenTenths View Post
The value will depend on the actual MAC that's coded on to the network card. If you only have one network card on a system you can usually delete the HWADDR line as your only network card will be eth0.

If you have multiple NICs in your server then the HWADDR line is essential so that networking has a physical to "logical" mapping.

You could also try
Code:
ifconfig -a
to show the HWaddr of the various NICs in your system.
Dear Sir TenTenths..

because of this below problem i am searching many blogs,, finally i found this page,, as per your advice only one network card i am using in my linux box, still not able to connect this server using putty.. pls have a look on my issue in detail which i posted in another page as a Question,, still no one answered this.. kindly help me

==================================================================================================== ================================

I am trying to transfer files from my Windows 7 machine into my VMware OEL 5 .

But i am not able to connect the Filezillah and not even able to login with Putty also.

About my System
1. My network is a normal one not having any domain and all, just a normal broadband modem so my IP is not a static IP [192.168.1.4]

2. My VM is a Fresh installed and it obtain the IP automatically [192.168.1.22]

3. In VM ware BRIDGE is enabled from the begging.

4. LINUX and WINDOWS can able to ping vice verse

5. Both Firewalls are Disabled


Kindly advice me what are the other options i have to check to connect my Putty to Linux Server and how do i transfer files to my linux box via filezilla..
 
Old 05-13-2014, 04:19 PM   #10
jefro
Guru
 
Registered: Mar 2008
Posts: 11,526

Rep: Reputation: 1404Reputation: 1404Reputation: 1404Reputation: 1404Reputation: 1404Reputation: 1404Reputation: 1404Reputation: 1404Reputation: 1404Reputation: 1404
Kind of a old post to add to.
 
Old 05-14-2014, 04:02 AM   #11
abdulhameedom
LQ Newbie
 
Registered: May 2014
Posts: 9

Rep: Reputation: Disabled
Unhappy

Quote:
Originally Posted by jefro View Post
Kind of a old post to add to.
Sir,, this may be a old post,, but i am facing this issue now,, how can i come from this stage,,
Kindly help me sir,,

i am totally fed up,, actually i planed to start learning Oracle Apps R12.. for that i need this linux box as the first platform where i start my installation,, for last 3 days i am struggling with this issue,,

Hope you can help me..
 
Old 08-05-2014, 10:24 PM   #12
jerrybk108
LQ Newbie
 
Registered: Aug 2014
Posts: 1

Rep: Reputation: Disabled
I fixed the error, Thanks!
I followed these steps:
1. type ifconfig -a to get Mac Address.
2. vi /etc/sys.../ifcfg-eth0 and replace HWADDR by the Mac Address I get by above step.
 
  


Reply

Tags
debian, fedora, interface, network


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
"..device eth0 does not seem to be present.." unable to network Redhat GP00 Linux - Networking 28 06-04-2009 10:54 AM
b44 error eth0 "device not found" [fedora 6][Dell] hkernel Linux - Hardware 5 12-13-2006 02:16 PM
OpenBSD: Adding a "lladdr" command to netstart to change MAC address at boot Voltar *BSD 2 04-14-2006 12:41 AM
USB Printer Problem "device not accepting new address" deckmoney Linux - General 1 04-16-2003 04:33 PM
MAC address shows up as " " , can Vmware cause this? gluelogic Linux - Networking 0 03-15-2002 05:10 PM


All times are GMT -5. The time now is 01:33 PM.

Main Menu
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration