Get list of ethernet devices

Polytropon freebsd at
Mon Nov 7 02:32:03 UTC 2011

On Mon, 07 Nov 2011 01:46:14 +0100, Michael Ross wrote:
> Moin,
> I'm setting up a system on an external USB drive,
> serving as fallback in case of a server failure:
> Customer takes USB drive, plugs it into any of his PCs and boots of it.
> Now I am looking for a good method to configure the network:
> I could just start dhclient on any NIC which could possibly be there,
> thus cramming rc.conf with
> 	ifconfig_em0="DHCP"
> 	ifconfig_em1="DHCP"
> 	ifconfig_fxp0="DHCP"
> and so on.
> Or I could grep ifconfig or dmesg output for ethernet interfaces and  
> dhclient these.
> Both sound like a very messy solution.
> So I would step beyond my current area of expertise, grep some source from  
> sysinstall, bsdinstall or somewhere and do it in C.
> But I'm kind of hoping anybody can point me to a readymade solution yet  
> unknown to me.

You could look at how FreeSBIE does it - it contains
"autodetect magic" also for graphics and sound.

Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...

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