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{ "type" : "node", "name" : "mac", "layout" : [ { "name" : "dst", "size" : "48", "format" : "mac", "default" : "00:00:00:00:00:01" }, { "name" : "src", "size" : "48", "format" : "mac", "default" : "00:00:00:00:00:02" }, { "name" : "ethertype", "size" : "16" } ] }