nic + detecting the presence of a carrier

[Jacques B.]

On 9/1/06, Les Mikesell <lesmikesell at gmail.com> wrote:
> On Fri, 2006-09-01 at 09:00 -0400, Jacques B. wrote:
> > On 9/1/06, Gregory Machin <gregory.machin at gmail.com> wrote:
> > > Stunning data ... but doesnt tell me if the nic is unpluged .. :-(
> > >
> >
> > The suggestion by Frank works like a charm.  Either of the two works
> > very well to detect if the NIC is working or not.  Then something as
> > simple as:
> >
> > /sbin/mii-tool eth0 | grep "link ok" && <insert command you wish to
> > execute if link ok>
> > with the command you wish to execute following the &&
>
> Do you do that continuously to detect when the link goes down?  That
> sounds like a lot of overhead.
>
> --
>   Les Mikesell
>     lesmikesell at gmail.com
>
>
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Good point.  I may have misunderstood the scenario.  I thought the OP
was looking to detect that in a script, not in a real time situation.
For that I do not know how it could be done with low overhead.  The
best I can suggest would be a crontab executing every x minutes
depending on the requirements of the OP.

Jacques B.