Dropped packets
should not occur on any network because they typically indicate congestion in the
network or an issue possibly with hardware. One percent dropped packets in either direction
can significantly throttle overall throughput.
Dropped packets in
vSphere can be monitored by selecting the ESXi host and clicking the
Performance tab. Select Advanced > Network > Real Time, and select None
in Counters. Select Receive packets dropped and Transmit packets dropped.
Iperf is a network
testing tool that can create a TCP or UDP data stream between two virtual or physical nodes. Iperf is open source software available for both Linux and
Windows at http://sourceforge.net/projects/iperf/.
To test the maximum
throughput of the network interfaces for 200 seconds:
On the server node,
execute the following command:
$ iperf -s -i 5
On the client node,
execute the following command:
$ iperf -c
<server-name> -t 200 -i 5 –m
During one of my
future posts I will be posting the demo of the utility in action in a VMware
ESXi environment.
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