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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LEARN ABOUT DEBIAN

netstat-nat

netstat-nat(1)						      General Commands Manual						    netstat-nat(1)

NAME

       netstat-nat - Show the natted connections on a linux iptable firewall

SYNOPSIS

       netstat-nat [options]

DESCRIPTION

       netstat-nat Displays NAT connections managed by netfilter/iptables which comes with the > 2.4.x linux kernels.

       The  program  reads  its information from '/proc/net/ip_conntrack' or '/proc/net/nf_conntrack', which is the temporary conntrack-storage of
       netfilter.

OPTIONS

       -h     displays help

       -n     don't resolve IPs/portnumbers to host/portnames

       -p <protocol>
	      display NAT connections with protocol selection (see /etc/protocols)

       -s <source host>
	      display connections by source IP/hostname

       -d <destination host>
	      display connections by destination IP/hostname

       -S     display SNAT connections

       -D     display DNAT connections

       -L     display only connections to NAT box self (doesn't show SNAT & DNAT)

       -R     display only connections routed through the NAT box (doesn't show SNAT & DNAT)

       -x     extended view of hostnames

       -r <src|dst|src-port|dst-port|state>
	      sort connections

       -o     no output header

       -N     display NAT box connection information (only valid with SNAT & DNAT)

       -v     prints version

FILES

       /proc/net/ip_conntrack or /proc/net/nf_conntrack

SEE ALSO

       http://www.tweegy.nl/projects/netstat-nat/
       http://www.netfilter.org/

AUTHOR

       netstat-nat has been written by D.Wijsman danny@tweegy.nl
       The manual page has been written by marceln@xs4all.nl

								     July 2002							    netstat-nat(1)