How to Test Network performance and Bandwidth

How to Test Network performance and Bandwidth

Introduction –

Network latency
and Bandwidth are the two metrics most likely to be of interest when you benchmark a network. Even though most service and product advertising focuses on bandwidth, at times the latency can be a more important metric.

** What is Bandwidth?

Bandwidth (BW) in computer networking refers to the data rate supported by a network connection or interface. BW is measured in terms of bits per second (bps).

** What is Network latency?

Latency is a measure of time delay experienced in a system. Network latency is simply defined as the time delay observed as data transmits from one point to another. There are a number of factors that contribute to network latency. These include transmission(medium of connectivity), Distance, Routers and computer hardware delays.

List of Projects used to test Network performance and Bandwidth –

1) bmon – Bandwidth monitor and rate estimator, it is console based,live BW
2) bwbar – Bandwidth usage in Text and Graphical format
3) bwm-ng – Bandwidth Monitor NG (Next Generation, live BW, console based
4) dstat – Dstat is a replacement for vmstat, iostat and ifstat.
5) iftop – Bandwidth usage on an interface, console based
6) iperf – Perform Network throughput tests bet two host
7) ifstat – Report InterFace STATistics
8) cbm – Color Bandwidth Meter ,console based
9) etherape – Graphical network traffic browser
10) iptraf – Interactive Colorful IP LAN Monitor, console and GUI based
11) netmrg – It is daemon based, mySQL support, Gathers data from devices.
12) nuttcp – Network performance measurement tool
13) nepim – network performance

NOTE ~ For some of them rpm or deb packages are not available!

Step 1] How to install on Redhat/RHCE,CentOS based system and Dibian based system –

root@me:~# yum install netperf iperf nuttcp nepim lmbench

** Ubuntu –

root@me:~# apt-get install  bmon bwbar bwm-ng dstat cbm etherape iftop iperf ifstat iptraf netmrg

Step 2] How to use – bmon, bwm-ng, dstat, ifstat –

root@me:~# bmon
interface: lo at me.arun.host
#   Interface                RX Rate         RX #     TX Rate         TX #
────────────────────────────────────────
me.arun.host (source: local)
0   lo                         0.00B            0       0.00B            0
1   eth0                       0.00B            0       0.00B            0
2   eth2                       0.00B            0       0.00B            0
3   vboxnet0                   0.00B            0       0.00B            0
4   pan0                       0.00B            0       0.00B            0
5   ppp0                      69.39KiB         61       7.49KiB         44

root@me:~# bwm-ng

bwm-ng v0.6 (probing every 0.500s), press ‘h’ for help
input: /proc/net/dev type: rate
\         iface                   Rx                   Tx                Total
==============================================================================
lo:           0.00 KB/s            0.00 KB/s            0.00 KB/s
eth0:           0.00 KB/s            0.00 KB/s            0.00 KB/s
eth2:           0.00 KB/s            0.00 KB/s            0.00 KB/s
ppp0:          64.39 KB/s            7.92 KB/s           72.31 KB/s
——————————————————————————
total:          64.39 KB/s            7.92 KB/s           72.31 KB/s

root@me:~# dstat
—-total-cpu-usage—- -dsk/total- -net/total- —paging– —system–
usr sys idl wai hiq siq| read  writ| recv  send|  in   out | int   csw
7   4  85   4   0   0| 281k  110k|   0     0 |   0     0 | 865  3013
8   4  88   0   0   0|   0     0 |7027B 1261B|   0     0 | 956  4505
8   5  86   0   0   0|   0     0 |  14k 1867B|   0     0 |1144  3332
9   5  86   0   1   0|   0     0 |  79k 2496B|   0     0 |1360  3366
18   8  74   0   0   0|   0     0 |  52k 6511B|   0     0 |1299  3618
8   6  85   0   1   0|   0     0 |  35k 5339B|   0     0 |1094  4231
6   4  90   0   0   0|   0     0 |   0  3164B|   0     0 | 953  2750 ^C
root@me:~#

root@me:~# ifstat
eth0                eth2                ppp0
KB/s in  KB/s out   KB/s in  KB/s out   KB/s in  KB/s out
0.00      0.00      0.00      0.00     95.73      4.31
0.00      0.00      0.00      0.00     67.93      8.17
0.00      0.00      0.00      0.00    106.77     13.70

** start “iperf” server on one host(A) and client on another host(B)- to measure Network throughput between two hosts.

* Host -A

root@me:~# iperf -s
————————————————————
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
————————————————————
[  4] local 192.168.0.1 port 5001 connected with 192.168.0.2 port 56171
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  9.11 GBytes  7.82 Gbits/sec

* Host -B
test@hostB:~$ iperf -c 192.168.0.1
————————————————————
Client connecting to 192.168.0.1, TCP port 5001
TCP window size: 49.5 KByte (default)
————————————————————
[  3] local 192.168.0.2 port 56171 connected with 192.168.0.1 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  9.11 GBytes  7.82 Gbits/sec
test@hostB:~$

root@me:~# iftop
root@me:~# cbm

Thank you,
Arun Bagul

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1 Reply to “How to Test Network performance and Bandwidth”

  1. hi,

    could you please let me know hoe to install nepim in linux,?

    is there any passive network measurement tools available ?

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