Amount of Network Traffic info from netstat output Post: 302595840

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Top Forums UNIX for Advanced & Expert Users Amount of Network Traffic info from netstat output Post 302595840 by agama on Sunday 5th of February 2012 12:25:43 PM

02-05-2012

Registered User

I'm not sure what you mean by 'traffic,' so I'll assume total bytes. If not, the technique can be applied to other measurements.

The output from netstat is a total count since 'the beginning of time' which is probably the last boot. The man page I just checked didn't give any indication so that's my assumption.

Regardless, in order to know what your traffic is, you have to capture a baseline value, and then at sometime in the future, capture a second value with the difference being the traffic over that period of time.

A small script like this can present output counts by the minute:

Code:

#!/usr/bin/env ksh

# print two values to stdout: outoctet count and inoctet count
function get_stats
{
    netstat  -s wlan0 | awk '        #<<<< change for your interface or remove for all
    /OutOctets/ { out=$2; next;}
    /InOctets:/ { inp = $2; next} 
    END {print out, inp }
    '
}

get_stats | read baseo basei   # seed the baseline values
while true
do
    sleep 60
    get_stats | read newo newi
    echo "inbound $(( newi - basei ))/min  outbound $(( newo - baseo ))/min"
    basei=$newi               # current becomes the baseline
    baseo=$newo
done

One note: Bash is not able to handle the syntax 'command | read x y' so this isn't a portable script. If you want to use this under bash you'll need to change each get_stats statement to these three:

Code:

values=$(get_stats)                    # bash compatable
baseo=${values% *}
basei=${values#* }

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varnetload

varnetload(8)					    Tool to create reproducable network traffic 				     varnetload(8)

NAME

       varnetload - tool to create reproducable network traffic

SYNOPSIS

       varnetload [-d delay] [-t time to run] [-u url]

DESCRIPTION

       varnetload is a simple python script to create reproducable sustained network traffic.

       In  order to use it effectively, you need to have an HTTP server present in your local LAN where you can put files. Upload a large HTML (or
       any other kind of file) to the HTTP server. Use the -u option of the script to point to that URL. Play with the delay option  to  vary  the
       load put on your network.

       delay  Sets  delay between individual downloads in miliseconds. Default value is 1000. But you my find values range from 0 to 500 more use-
	      ful.

       time to run
	      Sets total run time in seconds. Default value is 60.

       url    Sets downloaded resource. Default is http://myhost.mydomain/index.html.

SEE ALSO

       tuned(8) diskdevstat(8) netdevstat(8) scomes(8)

AUTHOR

       Written by Phil Knirsch <pknirsch@redhat.com>.

REPORTING BUGS

       Report bugs to <pknirsch@redhat.com>.

Phil Knirsch							    13 Jan 2011 						     varnetload(8)