{
  "nodes": [ {
      "name": "h1",
      "type": "host",
      "interfaces": {
        "net0": {
          "addressing": "dhcp"
        }
      }
    }, {
      "name": "h2",
      "type": "host",
      "interfaces": {
        "net0": {
          "addressing": "dhcp"
        }
      }
    }, {
      "name": "h3",
      "type": "host",
      "interfaces": {
        "net0": {
          "addressing": "static",
          "address": "192.168.2.10/24",
          "gateway": "192.168.2.1"
        }
      }
    }, {
      "name": "s1",
      "type": "switch"
    }, {
      "name": "s2",
      "type": "switch"
    }, {
      "name": "r0",
      "type": "router",
      "interfaces": {
        "netA": {
          "addressing": "static",
          "address": "192.168.1.1/24"
        },
        "netB": {
          "addressing": "static",
          "address": "192.168.2.1/24"
        }
      },
      "settings": {
        "ip_forward": true,
        "rp_filter": false
      }
    }
  ],

  "links": [ {
      "endpoints": [
        { "node": "h1",  "interface": "net0" },
        { "node": "s1",  "interface": "auto" }
      ]
    }, {
      "endpoints": [
        { "node": "h2",  "interface": "net0" },
        { "node": "s1",  "interface": "auto" }
      ]
    }, {
      "endpoints": [
        { "node": "h3",  "interface": "net0" },
        { "node": "s2",  "interface": "auto" }
      ]
    }, {
      "endpoints": [
        { "node": "r0",  "interface": "netA"  },
        { "node": "s1",  "interface": "auto" }
      ]
    }, {
      "endpoints": [
        { "node": "r0",  "interface": "netB"  },
        { "node": "s2",  "interface": "auto" }
      ]
    }
  ],

  "services": [ {
      "type": "dhcp-server",
      "node": "r0",
      "interface": "netA",
      "settings": {
        "range": {
          "start": "192.168.1.100",
          "end": "192.168.1.200"
        },
        "gateway": "192.168.1.1"
      }
    }
  ]
}