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On a MBP (OS X 10.6.2) I've got the wired ethernet and wireless airport configurations set up to use the same static IP to my router (e.g. as described at http://forums.macrumors.com/archive/index.php/t-708685.html). I've also got the Service Order set up so that the wired connection is above Airport (e.g. as described at Mac OS X automatically turn off Airport if ethernet cable is plugged in).
This seems to "work": an open ssh connection to a remote location stays up as I plug in and unplug the ethernet cable. However, since the Airport card stays live (and connected to the router) regardless of whether the wired connection is present, how can I tell that the wired interface is actually the "active" connection when it is available? Since the IP address is the same for both, is this a guarantee that the wireless interface cannot be used? Is there some other way to tell if this interface is in use?
PS. I'm going to post a (partial) answer as soon as I post this, as the act of writing this up and checking all my facts lead me to some insights. (The more interesting and unanswered part is in bold above.)
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Addendum: through the third-party extension "MenuMeters" (http://www.ragingmenace.com/software/menumeters/), it is possible to see which is the "active" interface and also the bandwidth being used across all interfaces, which makes it clear that the active interface does indeed switch properly (as desired) when the wired connection is plugged in and removed.
– Ether – 2010-01-31T03:29:02.890