Hi all,

I've found that Ryu does not detect the disconnection of a switch when TCP does 
not signal the event with a FIN or RST (examples: switch powered off or 
backhaul cable disconnected).

This appears to be because the TCP session remains in half-open established 
state in the controller operating system, so no event is signalled to Ryu.

Is this a scenario that Ryu should detect, and if so, have techniques like TCP 
keepalive been considered?



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