[
    {
        "name" : "eth0<->eth1",
        "items":
        [
            {
                "nic-name": "eth0",
	            "type": 4
            },
            {
               "nic-name": "eth1",
               "type": 6,
	       "mtu": 1000,
               "prefix": "42::"
            }
        ]
    },
    {
        "name" : "eth2<->eth3",
        "items":
        [
            {
                "nic-name": "eth2",
	            "type": 4
            },
            {
               "nic-name": "eth3",
               "type": 6,
               "prefix": "23::"
            }
        ]
    }
]