[K12OSN] Finding MAC address for NIC

[Doug Simpson]

On Wed, 26 Apr 2006, Angus Carr wrote:

> Doug Simpson wrote:
> > I have a server that has 3 NICs in it.
> >
> > Eth0 and Eth2 are configured.
> >
> > Eth0 is private and Eth2 is public in this K12LTSP server.
> >
> > What I want to do is enable eth1, give it a public number and use it to 
> > monitor traffic in and out of our LAN by connecting it to a *hub* that is 
> > between our router and our first public switch.
> >
> > I think all I need is to know how to determine the MAC address on the NIC 
> > so I can configure it.
> >
> > I can shutdown the server, remove the NIC and let kudzu remove it, then 
> > restart it and let kudzu re-configure it, and that may work, but I can't 
> > take it down to do that since it is our main server.
> >
> > Any ideas?
> >   
> Try "ifconfig eth1" which will give you the MAC ID whether or not it's 
> configured/connected/etc - just as long as it is present.

This does not give a MAC address, either.  The interface has to be 
configured for ifconfig to show it as far as I can tell.
> 
> For that matter, I can also get mine with "cat /proc/net/arp", but that 
> may only work with configured and connected if's.
> /proc/net/dev contains a list of network devices, which also has MAC ID. 
> Again, this may only be the configured ones...
> 
> Angus Carr.
> 
> 
> 
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