How to detect the physical connected state of a network cable/connector?
Tue, 2012.01.31 - 10:26 — müzso
According to my experience with Debian 6.* (and kernel v2.6.32-5) the
The
grep '' /sys/class/net/eth*/carrier /sys/class/net/eth*/operstateAccording to my experience with Debian 6.* (and kernel v2.6.32-5) the
carrier is 1 if the cable is connected and there's a signal, and it's 0 otherwise (or access to the carrier gives an Invalid argument error).The
operstate is up or down according to whether the interface is brought up or not.
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