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After a host gets its gateway address, it will send out ARP packet to look for the MAC address. Since there is no physical gateway in SDN, the virtual gateway module in ONOS will take care all the ARP requests. In detail, virtual gateway module registers from ONOS for all the ARP packet-ins. It will check whether the target address in the ARP request packet is the virtual gateway address. If so, virtual gateway module will composes the ARP reply packet and send it out as packet-out to the host. Currently, we configure each gateway address together with each IP prefix in the configuration file.
Configuration
BGP Speaker Configuration
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