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Date: Wed, 17 Oct 2007 19:03:22 -0400
From: "David Yeske" <dyeske@gmail.com>
To: "FreeBSD Stable List" <freebsd-stable@freebsd.org>
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Subject: interface speed support
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Is there a way to determine the supported interface speed of a
particular driver?  If I have a gigabit ethernet device connected to a
100baseTX switch, how can I determine the interface supports gigabit
ethernet?  I have tried parsing the following.  Is there a cleaner way
to do this?

sysctl -A | grep phy | grep desc