mtr tools
1. --report: send 10 packets at EACH hop
2. packet loss: because 1, packet loss is per host
3. mechanics: ICMP low ttl packets => rely on router's ICMP ttl response
3. other columns: latency, deriavation

refereneces:
1. Diagnosing Network Issues with MTR( https://www.linode.com/docs/networking/diagnostics/diagnosing-network-issues-with-mtr
2. networking - How does mtr work / interpreting pain points using mtr - Server Fault( http://serverfault.com/questions/542527/how-does-mtr-work-interpreting-pain-points-using-mtr