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Old 7th November 2008
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robbak robbak is offline
Real Name: Robert Backhaus
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Join Date: May 2008
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The official guide tells us that behaviour when two interfaces have the same network address is "undefined". Do a search for the phrase "nasal demons" if you want to know more about that!

Basically, what a system does in this case is up to it. FreeBSD gives an error and refuses to allow it, most systems silently disable one of the devices, others do things like round-robbin-ing outbound packets. But, without a doubt, two interfaces on one subnet is a misconfiguration.

If you need this, then you need to set up some kind of a virtual interface device that merges the two physical interfaces. Most systems have some support for this.
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