Port Knocking @ controller
{"Image DocumentName": "Port controller", "Image ImageDescription": "DROP. IPsrc=any. Port=any. When knock sequence. finalized, add entry. <Ipsrc, port=22; forward> Encapsulate & forward ALL packets of ALL flows. IPsrc=any. Port=any. controller. Lots of overhead!! Needed as no \u00abknock\u00bb state handled in switch. Maintain Knock state per flow. G. Bianchi & A. Capone - SDN tutorial.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}