mtr
mtr combines the functionality of the traceroute and ping programs in a single network diagnostic tool.
As mtr starts, it investigates the network connection between the host mtr runs on and HOSTNAME by sending packets with purposely low TTLs. It continues sending packets with low TTL, noting the response time of the intervening routers. This allows mtr to print the internet route's response percentage and response times to HOSTNAME. A sudden packet loss or response time increase often indicates a bad (or simply overloaded) link.
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