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List:       freebsd-hackers
Subject:    Re: Disabling ethernet link on an Intel nic?
From:       Dave Duchscher <daved () tamu ! edu>
Date:       2012-08-16 13:37:49
Message-ID: B3F13242-7615-483E-BD20-E5A13CA9F465 () tamu ! edu
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On Aug 14, 2012, at 1:16 AM, Eugene Grosbein wrote:

> 11.08.2012 20:35, David Duchscher пишет:
> > Greetings, 
> > 
> > I have a need to turn off the link of an ethernet port on a Intel nic.  The issue \
> > is not a big deal but one we would like to solve.  we have no way of signaling an \
> > upstream router that a path is down but via turning off the link of the ethernet \
> > port.  This would only be used when something goes wrong. The hope is that we \
> > could automate some problems and handle other situations remotely avoiding having \
> > to visit the system in person. 
> > Any thoughts?  We can modify the system so if it means modifying the driver or \
> > some other code, I am willing to try.  Just need a little direction. 
> > Thanks for your time,
> 
> I made such patch a couple of years ago and run it in production with copper-based
> em(4) and igb(4) NICs. The patch introduces new sysctls like \
> dev.em.X.down_disables_link and dev.igb.X.down.disables_link with default zero \
> values.  Setting sysctl dev.em.0.down_disables_link=1 makes "ifconfig em0 down" \
> bring link down. 
> http://www.grosbein.net/freebsd/patches/em_sysctl-8.3.diff.gz
> http://www.grosbein.net/freebsd/patches/igb_sysctl-8.3.diff.gz

This is exactly what we needed.  Thanks for sharing this with us.

--
DaveD



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