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I have network based on stupid hubs.

And freebsd router in center of this network.

Today i see in 'systat -vmstat' :
Interrupts 8005 em1:rx 0

That was a loop on one hub.

Is there any way to detect this and email me if this happent?

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up vote 2 down vote accepted

Either institute sufficient administrative controls to prevent loops from being formed or replace your hubs with switches capable of running spanning tree.

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Yep, i am sure, that will work. But for now i searching pure-freebsd solution. – Korjavin Ivan Aug 27 '12 at 9:03
@KorjavinIvan: I doubt an email's going to make it out on a looped network. – David Schwartz Aug 27 '12 at 10:17
no,no. em0 connect to upstream and can send email, its not a problem – Korjavin Ivan Aug 27 '12 at 12:01

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