mmand is used to display the status of network connections to a UNIX machine. One of the functions it can be used for is to display the contents of the kernel routing table by using the -r switch.For example;The following examples are from two machines on CQU's Rockhampton campus. The first one is from telnet jasper[david@cq-pan:~]$ netstat -rnKernel routing tableDestination Gateway Genmask Flags Metric Ref Use Iface138.77.37.0 0.0.0.0 255.255.255.0 U 0 0 109130 eth0127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 9206 lo0.0.0.0 138.77.37.1 0.0.0.0 UG 0 0 2546951 eth0 bash$ netstat -rnRouting tablesDestination Gateway Flags Refcnt Use Interface127.0.0.1 127.0.0.1 UH 56 7804440 lo0default 138.77.1.11 UG 23 1595585 ln0138.77.32 138.77.1.11 UG 0 19621 ln0138.77.16 138.77.1.11 UG 0 555 ln0138.77.8 138.77.1.11 UG 0 385345 ln0138.77.80 138.77.1.11 UG 0 0 ln0138.77.72 138.77.1.11 UG 0 0 ln0138.77.64 138.77.1.11 UG 0 0 ln0138.77.41 138.77.1.11 UG 0 0 ln05.4 The “traceroute” CommandA) tracerouteFor some reason or another, users on one machine cannot connect to another machine or if they can any information transfer between the two machines is either slow or plagued by errors. It is not only the machines at the two ends you have to check. If the two machines are on different networks the information will flow through a number of gateways and routers. It might be one of the gateway machines that is causing the problem.The traceroute command provides a way of discovering the pa...
