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I'm wanting to send a string from Controller to a host in Ryu controller. I need send a String inside the packet-out but the documentation isn't clear about it. I've tried some solutions, but i can't do it.

Ramón Cordeiro
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  • Why do you want to send data from an sdn controller to a host, what is your scenario? SDN controllers communicate with switches not hosts. – Yavuz Sert Sep 19 '17 at 12:16
  • Because I receive data from cliente and I wanto to send this data to other controller ( to do authentication of cliente). – Ramón Cordeiro Sep 20 '17 at 13:26
  • The scenario is a network which a User trying to authentication himself but the process is distribuited – Ramón Cordeiro Sep 20 '17 at 13:27
  • Which openflow switch are you using? Hosts don't send data to controllers, switches do. You need a flow on openflow switch, for example if you you use 802.1x authentication you need a eapol flow (ETH_TYPE:eapol). After that, if host sends eapol message to switch (it is the authentication request), switch asks the controller to send this packet. You can forward this packet to a port that other application is connected. – Yavuz Sert Sep 20 '17 at 13:37

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Following the comments, you can setup any means of IPC if the two controllers are on same PC or a TCP socket if on different PCs but same network.

Himanshu Tanwar
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