Is there a way to make the link state drop on an ag71xx interface, so that 
it appears to whatever equipment is connected to the port that the cable 
has been disconnected?

I've got a WNDR3700-family device and I need to make it appear to the 
equipment connected to its eth1 interface that the cable has been 
disconnected. "ifconfig eth1 down" doesn't alter the link state at all. 
It'd be OK if the state just dropped momentarily and then returned. So 
far, the best I've been able to do is reboot the entire WNDR3700. That's a 
more drastic approach than I'd like to use, as there are other things 
happening on the system that I'd rather not interrupt.

I'm very open to the possibility of ag71xx driver changes to make this 
work (either as a local change or something for wider distribution) but I 
haven't found any data sheets for this device, so I'd basically be 
starting by stabbing around in the dark.

Does anyone have any pointers?
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