When a ping or traceroute emasurement fails, we do not know the IP address of the probe (empty "from" and no "src_addr"), which is annoying when you want to analyze the possible causes of the failure: { "size": 20, "addr": "2620:0:2d0:200:0:0:0:7", "min": -1, "rcvd": 0, "from": "", "dst_name": "2620:0:2d0:200:0:0:0:7", "af": 6, "timestamp": 1374395985, "fw": 4520, "proto": "ICMP", "name": "www.icann.org", "prb_id": 3953, "result": [ { "error": "sendto failed: Network is unreachable" }, { "error": "sendto failed: Network is unreachable" }, { "error": "sendto failed: Network is unreachable" } ], "max": -1, "dup": 0, "avg": -1, "type": "ping", "dst_addr": "2620:0:2d0:200::7", "sent": 0, "msm_id": 1013576 },