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Date: Thu, 12 Jul 2012 17:30:37 -0500
From: "Paul A. Procacci" <pprocacci@datapipe.com>
To: Chris Benesch <chris.benesch@gmail.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: System doesn't detect unplugged network cable and doesn't set
 interface up properly with DHCP
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On Thu, Jul 12, 2012 at 03:25:07PM -0700, Chris Benesch wrote:
> Maybe another option to dhclient to have it poll the interface every 2-3
> seconds to see if it has lost a link and if so, set the lease timer to be
> expired, and wait for it to come back and once it does, it will acquire a
> new address.
> _______________________________________________
> freebsd-net@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-net
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The Operating system should generate a devd event.

Something like the following in /usr/local/etc/devd.conf should do the tric=
k,
though I haven't tested the below with anything other than carp interfaces.
I suspect it works just the same.

######################################################
notify 30 {
        match "system" "IFNET";
        match "subsystem" "em0_or_whatever";
        match "type" "LINK_UP";
        action "/usr/local/sbin/script_to_do_something.sh up";
};

notify 30 {
        match "system" "IFNET";
        match "subsystem" "em0_or_whatever";
        match "type" "LINK_DOWN";
        action "/usr/local/sbin/script_to_do_something.sh down";
};
######################################################

~Paul

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