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Re: [vox-tech] different MAC address when using "ifconfig" and "arp"
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Re: [vox-tech] different MAC address when using "ifconfig" and "arp"



Someone correct me if I'm wrong, but a router has to have at least two MAC addresses, right? Maybe you are seeing the two different eth devices.

2008/4/13, Hai Yi <yihai2004@gmail.com>:
Thank you, Bryan:

I think you are pretty much correct: it looks like this "arp" command
is equivalent to another command "ip neighbor", which pretty much
speaks for itself. However, I checked the MAC on my router, it appears
to be   00:14:BF:D3:AE:2A, which is one digit greater in the last
section than the one from arp command. (00:14:BF:D3:AE:29 ) Why is
that?

Thanks,

Hai


On Sun, Apr 13, 2008 at 2:15 PM, Bryan Richter <bryan.richter@gmail.com> wrote:
> 2008/4/13, Hai Yi <yihai2004@gmail.com>:
>
>
> > Hello,
> >
> > I thought I can get my ether card's MAC address by using either
> > "ifconfig eth0" command or "arp -v" command, but these commands
> > returned different MAC address(00:16:E6:5C:DA:B8 vs
> > 00:14:BF:D3:AE:29). Did I miss something here?
> >
> > I am using Ubuntu and the following are the results:
> >
> >
> > hai@zodiac:~$ ifconfig eth0
> > eth0      Link encap:Ethernet  HWaddr 00:16:E6:5C:DA:B8
> >           inet addr:192.168.1.103  Bcast:192.168.1.255  Mask:255.255.255.0
> >           inet6 addr: fe80::216:e6ff:fe5c:dab8/64 Scope:Link
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> >           RX packets:27120 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:26884 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 txqueuelen:1000
> >           RX bytes:6831509 (6.5 MiB)  TX bytes:3820509 (3.6 MiB)
> >           Interrupt:16
> >
> > hai@zodiac:~$ arp -v
> > Address                  HWtype  HWaddress           Flags Mask
> Iface
> > .                        ether   00:14:BF:D3:AE:29   C
> eth0
> > Entries: 1      Skipped: 0      Found: 1
> >
> >
> > Thanks a lot!
> > Hai
>
>
>  I think arp shows your adapter's neighbors, not the adapter itself. I only
> just read the man page for the first time, however, its results when I run
> it seem to confirm that:
>
>  192.168.1.1              ether   00:18:4D:25:82:0D   C
> ath0
>
>  My adapter's neighbor is, indeed, 192.168.1.1 (my router).
>
>  ifconfig, on the other hand, seems like a much better place to find info
> about the device, itself. Also, the address it gives for my device matches
> the sticker that the manufacturer put on my laptop. :)
>
>  -Bryan

> _______________________________________________
>  vox-tech mailing list
>  vox-tech@lists.lugod.org
>  http://lists.lugod.org/mailman/listinfo/vox-tech
>
>
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--
Bryan Richter
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