{
    "type" : "node",
    "name" : "ipv4",
    "layout" : [
        {
            "name" : "version",
            "size" : "4",
            "default" : "4",
            "readonly" : "true"
        },
        {
            "name" : "ilh",
            "size" : "4",
            "default" : "5",
            "readonly" : "true"
        },
        {
            "name" : "dscp",
            "size" : "6"
        },
        {
            "name" : "ecn",
            "size" : "2"
        },
        {
            "name" : "totallength",
            "size" : "16",
            "default" : "20",
            "autoincrease" : "true"
        },
        {
            "name" : "identification",
            "size" : "16"
        },
        {
            "name" : "reserved",
            "size" : "1"
        },
        {
            "name" : "df",
            "size" : "1"
        },
        {
            "name" : "mf",
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        },
        {
            "name" : "fragmentoffset",
            "size" : "13"
        },
        {
            "name" : "ttl",
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        },
        {
            "name" : "protocol",
            "size" : "8"
        },
        {
            "name" : "checksum",
            "size" : "16"
        },
        {
            "name" : "src",
            "size" : "32",
            "format" : "ipv4",
            "default" : "1.1.1.1"
        },
        {
            "name" : "dst",
            "size" : "32",
            "format" : "ipv4",
            "default" : "2.2.2.2"
        }
    ]
}