[BusyBox] ethernet interface monitor?

[Pete Flugstad]

Greetings,

   I think this has been discussed on this list before, but my quick 
searches of the list didn't turn up anything.

   I'm looking for a way to monitor the up/down status of an Ethernet 
interface.  I recall seeing something, "ifmon" or something like that, 
that was basically just a very simple daemon program that does this?

   Anyway, I know I can repeatedly poll IFFLAGS and just watch for 
up/down transitions, but I was under the impression that there was a 
more efficient (i.e. event style) type interface available.  I was 
hoping this "ifmon" program would show me how to do that.

Thanks,
Pete