SRE network check tools

nc (netcat) - arbitrary TCP and UDP connections and listens
-words [-46DdhklnrStUuvz] [-i interval] [-p source_port] [-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_protocol] [Xo -x proxy_address[: port]] [hostname] [port[s]]
nc -wz baidu.com

mtr - a network diagnostic tool
mtr combines the functionality of the traceroute and ping programs in a single network diagnostic tool.
mtr -rw example.com

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