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03-12-2003 05:35 PM
03-12-2003 05:35 PM
Mac Address?
I've been getting good helps from you ^^
I have Linux redhat 2.2.14-5.0
The linux system has 2 interface cards, eth0, eth1
but when I type ifconfig -a on system
its output like attached file
but
I am not able to understand why the Mac address are same
HWaddr 08:00:20:B8:C2:ED ,though physcal interfaces are totally different
but it seems like that functions are normal
can you give the why Mac addresses are same and How they are corrected
I think it should be solved
System have been generating messages like
messages:Mar 13 09:11:10 redhat kernel: eth0: HAPPY MEAL (PCI/CheerIO) 10/100BaseT Ethernet 08:00:20:b8:c2:ed
messages:Mar 13 09:11:10 redhat kernel: eth1: HAPPY MEAL (PCI/CheerIO) 10/100BaseT Ethernet 08:00:20:b8:c2:ed
messages:Mar 13 09:11:10 redhat kernel: eth0: Link is up using internal transceiver at 100Mb/s, Full Duplex.
messages:Mar 13 09:11:10 redhat kernel: eth1: Link is up using internal transceiver at 100Mb/s, Half Duplex.
and this morning system are hung for a while...without any messages.
It had happened several times.
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03-12-2003 06:15 PM
03-12-2003 06:15 PM
Re: Mac Address?
What distribution of Linux are you using?
What version of 'ifconfig' are you using? ('ifconfig --version')
What type of network cards are they? (using 'lsmod', or viewing '/etc/conf.modules' (or '/etc/modules.conf', depending on the age of the 'modutils' binaries) should get the driver names).
On a number of different machines I have around the place with distributions around the same time period, none of them exhibit this behaviour.
If they are the 'cheap' card from the shop-down-the-road, then it is entirely possible that the two cards do actually have the same MAC adderss (seen this once before!). But they would have to be identical cards.
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03-13-2003 11:32 AM
03-13-2003 11:32 AM
Re: Mac Address?
===============================
messages:Mar 13 09:11:10 redhat kernel: eth0: HAPPY MEAL (PCI/CheerIO) 10/100BaseT Ethernet 08:00:20:b8:c2:ed
===============================
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03-13-2003 03:18 PM
03-13-2003 03:18 PM
Re: Mac Address?
The "Happy Meal" card is a Sun Microsystems NIC. Is this by chance one of the 4 port cards?
IIRC, it has been awhile since I've messed with a Sun box. All ethernet interfaces, by default, have the same MAC address on a Sun box. The driver gets the MAC from the PROM in the system and ignores the address on the card. At least that's how it works with Solaris, I'm not sure what happens with the Linux drivers.
--
Tony
BTW, The first 3 octets of the MAC address are the vendor ID.
08:00:20 = Sun Microsystems Inc.
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03-13-2003 06:33 PM
03-13-2003 06:33 PM
Re: Mac Address?
Do you know of an online list of Vendor ID's? I can think of far too many situations where it would be helpful to know.
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03-13-2003 06:35 PM
03-13-2003 06:35 PM
Re: Mac Address?
Silly me should have done 10second search first, then asked..
http://standards.ieee.org/regauth/oui/oui.txt
*whee!*
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03-13-2003 06:48 PM
03-13-2003 06:48 PM
Re: Mac Address?
I intalled redhat on sun ultra60 system
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03-13-2003 07:01 PM
03-13-2003 07:01 PM
Re: Mac Address?
As to how to get the kernel to look at the card instead of the PROM, I don't know. Unless an Updated kernel fixes this, I'm unaware of another way to fix the issue.
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03-13-2003 09:54 PM
03-13-2003 09:54 PM
Re: Mac Address?
If the interfaces are NOT attached to the same physical network, both of them having the same MAC address should not be causing any problems.
Stuart,
Here is a lookup site I found with a quick google search:
http://coffer.com/mac_find/
--
Tony