{
  "handlers": [
    {
      "class_name": "EthernetEcho",
      "args": {
        "processor_interval": "10",
        "sender_interval": "20"
      }
    }
  ],
  "interfaces": [
    {
      "interface_name" : "eth0",
      "lead_handler" : "EthernetEcho",
      "pcap_filter" : ""
    }
  ]
}

{
  "handlers": [
    {
      "class_name": "EthernetEcho",
      "args": {
        "processor_interval": "10",
        "sender_interval": "20"
      }
    }
  ],
  "interfaces": [
    {
      "interface_name" : "echoer-eth0",
      "lead_handler" : "EthernetEcho",
      "pcap_filter" : ""
    }
  ]
}

Change eth0 to echoer-eth0 in json config for test
Change eth0 to echoer-eth0 in json config for test

