Re: Ethernet MACaddress constantly changing
OK, I did some testing: rebooted from Linux to Windows and the other
way around a couple of times and got the following peculiar results:
1. linux: 0:80:0:10:b7:7c
2. windows: 0:10:5a:92:b7:7c
3. linux: 80:0:0:10:85:bb
4. windows: 0:10:5a:92:b7:7c
5. linux: 2:0:0:10:2:16
6. windows: 0:10:5a:92:b7:7c
7. linux: 4:0:0:10:8:5b
It seems to be a linux-only problem, windows is stable (at least something
about Windows that's stable :-) ).
...wait a minute... turning of vmware ethernet bridge...
8. linux: 0:10:5a:92:b7:7c
...looks good... once more...
9. linux: 1:0:0:10:1:b
...damn...
10. linux: 0:10:5a:92:b7:7c
I think it's not even Linux, it's probably the card itself :-(
I should again get a bogus one...
11. linux: 1:0:0:10:1:b
...yep there it is again :-(
OK never mind it seems to be something with the card itself :-(
Nico
> Hello James M.,
>
> On 12-Aug-99, you wrote:
>
> <snip>...
>
> LJM> MAC addr is another story.
> LJM> That should be fixed to the adaptor and never change. (Well,
> LJM> almost never. There are a few that have mac addresses that
> LJM> are able to be modified with a special utility. The only ones
> LJM> I know about are for older minicomputers...)
> LJM>
>
> Likewise, I have encountered systems where the Eth Addr could be changed
> but again, it was a long time ago and I think they were minis. I doubt
> the 3Com NIC Eth could be changed.
>
> LJM>> I have a portable with a 3Com 3CCE589ET CPCMCIA network
> LJM>> adapter. I'm also running arpwatch on my network to check for
> LJM>> "ellegal aliens". I noticed that everytime a reboot my portable
> LJM>> from linux to windows or the other way around I get a message
> LJM>> from arpwatch that the Ethernet address of my portable changed.
> LJM>> Shouldn't the ethernet address be network-card-specific. Is either
> LJM>> Linux or Windows98 changing my Ethernet address and ifso why?
> LJM>>
>
> Assuming arp on Debian is like other unixes I've used, go to another m/c
> on your network and ping your laptop then arp -a it - this should
> return the Eth. Do it before and after rebooting the L/T.
>
> Also, does arpwatch give you the addresses? Are the addresses
> consistent - is the change always from addr A to addr B or does it
> vary. For example, if you boot from Windoze to Debian and then back to
> W, what addresses are reported by arpwatch and what do you get by
> ping/arp -a at each step?
>
> Could this just be the NIC Eth going to null during the re-boot?
>
> Regards,
>
> LeeE
> --
>
> http://www.spatial.freeserve.co.uk
>
>
>
>
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