Does anybody knows why ethernet interfaces stay's up even when i unplug the ethernet cable? I have 2 isp connected to a box, with a default route pointing both of them one using a higer weight to use it as backup conection (using iproute2). Ok, if i unplug the ethernet cable of eth of isp1 , the ethernet card stays up and nobody can make any connection. But, if i "really" force the interface shutdown of provider1 (doing ifdown eth1) the traffic goes instantly trough provider2. Any idea how can i tear down an interface when i unplug the ethernet cable? Thanks in advance.
