Three tools to show network brandwith under linux cmd

1. Iftop : Display brandwidth by host(address)

$ iftop –help iftop: unknown option – iftop: display bandwidth usage on an interface by host

Synopsis: iftop -h | [-npblNBP] [-i interface] [-f filter code] [-F net/mask] [-G net6/mask6]

-h display this message -n dont do hostname lookups -N dont convert port numbers to services -p run in promiscuous mode (show traffic between other hosts on the same network segment) -b dont display a bar graph of traffic -B Display bandwidth in bytes -i interface listen on named interface -f filter code use filter code to select packets to count (default: none, but only IP packets are counted) -F net/mask show traffic flows in/out of IPv4 network -G net6/mask6 show traffic flows in/out of IPv6 network -l display and count link-local IPv6 traffic (default: off) -P show ports as well as hosts -m limit sets the upper limit for the bandwidth scale -c config file specifies an alternative configuration file

iftop, version 1.0pre2 copyright (c) 2002 Paul Warren pdw@ex-parrot.com and contributors

Ref: http://www.thegeekstuff.com/2008/12/iftop-guide-display-network-interface-bandwidth-usage-on-linux/

2. bwm-ng: display brandwidth by interface

$ bwm-ng –help Bandwidth Monitor NG (bwm-ng) v0.6 Copyright (C) 2004-2007 Volker Gropp bwmng@gropp.org USAGE: bwm-ng [OPTION] … [CONFIGFILE] displays current ethernet interfaces stats

Options: -t, –timeout displays stats every (1msec = 1/1000sec) default: 500 -d, –dynamic [value] show values dynamicly (Byte KB or MB) -a, –allif [mode] where mode is one of: 0=show only up (and selected) interfaces 1=show all up interfaces (default) 2=show all and down interfaces -I, –interfaces show only interfaces in (comma seperated), or if list is prefaced with % show all but interfaces in list -S, –sumhidden [value] count hidden interfaces for total -A, –avglength sets the span of average stats (Default 30s) -D, –daemon [value] fork into background and daemonize -h, –help displays this help -V, –version print version info

Input: -i, –input input method, one of: proc netstat libstatgrab disk libstatdisk -f, –procfile filename to read raw data from. (/proc/net/dev) –diskstatsfile filename to read diskstats (Linux 2.6+) from. (/proc/diskstats) –partitionsfile filename to read diskstats (Linux 2.4) from. (/proc/partitions)

Output: -o, –output output method, one of: plain, curses, curses2, csv, html -u, –unit unit to show. one of bytes, bits, packets, errors -T, –type type of stats. one of rate, max, sum, avg -C, –csvchar delimiter for csv -F, –outfile output file for csv and html (default stdout) -R, –htmlrefresh meta refresh for html output -H, –htmlheader show and frame for html output -c, –count number of query/output for plain & csv -N, –ansiout disable ansi codes for plain output (ie 1 for one single output)

Ref: http://archive09.linux.com/feature/52443

3. nethogs: display network brandwidth by process

$ nethogs –help nethogs: invalid option – ‘-’ usage: nethogs [-V] [-b] [-d seconds] [-t] [-p] [device [device [device …]]] -V : prints version. -d : delay for update refresh rate in seconds. default is 1. -t : tracemode. -b : bughunt mode - implies tracemode. -p : sniff in promiscious mode (not recommended). device : device(s) to monitor. default is eth0

When nethogs is running, press: q: quit m: switch between total and kb/s mode

Ref: http://nethogs.sourceforge.net/

4. Other tools

http://www.tecmint.com/command-line-tools-to-monitor-linux-performance/

nmon: a tool to analise linux performance http://www.ibm.com/developerworks/aix/library/au-analyze_aix/

4. sar: Collect, report, or save system activity information

$ sar -n DEV 1 3 Linux 3.8.8-202.fc18.x86_64 (localhost.localdomain) 07/26/2013 x86_64 (4 CPU)

04:20:01 PM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s 04:20:02 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00 04:20:02 PM em1 5.00 2.00 0.63 0.16 0.00 0.00 4.00

04:20:02 PM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s 04:20:03 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00 04:20:03 PM em1 2.00 2.00 0.12 0.12 0.00 0.00 0.00

04:20:03 PM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s 04:20:04 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00 04:20:04 PM em1 2.00 1.00 0.30 0.06 0.00 0.00 0.00

Average: IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s Average: lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average: em1 3.00 1.67 0.35 0.12 0.00 0.00 1.33

5. Use Scripts:

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#!/bin/bash
IF=$1
if [ -z "$IF" ]; then
        IF=`ls -1 /sys/class/net/ | head -1`
fi
RXPREV=-1
TXPREV=-1
echo "Listening $IF..."
while [ 1 == 1 ] ; do
        RX=`cat /sys/class/net/${IF}/statistics/rx_bytes`
        TX=`cat /sys/class/net/${IF}/statistics/tx_bytes`
        if [ $RXPREV -ne -1 ] ; then
                let BWRX=$RX-$RXPREV
                let BWTX=$TX-$TXPREV
                echo "Received: $BWRX B/s    Sent: $BWTX B/s"
        fi
        RXPREV=$RX
        TXPREV=$TX
        sleep 1
done

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#!/usr/bin/perl

use strict;
use warnings;

use POSIX qw(strftime);
use Time::HiRes qw(gettimeofday usleep);

my $dev = @ARGV ? shift : 'eth0';
my $dir = "/sys/class/net/$dev/statistics";
my %stats = do {
    opendir +(my $dh), $dir;
    local @_ = readdir $dh;
    closedir $dh;
    map +($_, []), grep !/^\.\.?$/, @_;
};

if (-t STDOUT) {
    while (1) {
        print "\033[H\033[J", run();
        my ($time, $us) = gettimeofday();
        my ($sec, $min, $hour) = localtime $time;
        {
            local $| = 1;
            printf '%-31.31s: %02d:%02d:%02d.%06d%8s%8s%8s%8s',
            $dev, $hour, $min, $sec, $us, qw(1s 5s 15s 60s)
        }
        usleep($us ? 1000000 - $us : 1000000);
    }
}
else {print run()}

sub run {
    map {
        chomp (my ($stat) = slurp("$dir/$_"));
        my $line = sprintf '%-31.31s:%16.16s', $_, $stat;
        $line .= sprintf '%8.8s', int (($stat - $stats{$_}->[0]) / 1)
            if @{$stats{$_}} > 0;
        $line .= sprintf '%8.8s', int (($stat - $stats{$_}->[4]) / 5)
            if @{$stats{$_}} > 4;
        $line .= sprintf '%8.8s', int (($stat - $stats{$_}->[14]) / 15)
            if @{$stats{$_}} > 14;
        $line .= sprintf '%8.8s', int (($stat - $stats{$_}->[59]) / 60)
            if @{$stats{$_}} > 59;
        unshift @{$stats{$_}}, $stat;
        pop @{$stats{$_}} if @{$stats{$_}} > 60;
        "$line\n";
    } sort keys %stats;
}

sub slurp {
    local @ARGV = @_;
    local @_ = <>;
    @_;
}