Bandwidth Monitor NG is a small and simple console-based live network and disk io bandwidth monitor for Linux, BSD, Solaris, Mac OS X and others.
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bwm-ng v0.6.1
Copyright (C) 2004-2015 Volker Gropp (

What is this?

Bandwidth Monitor NG is a small and simple console-based live network and disk
io bandwidth monitor for Linux, BSD, Solaris, Mac OS X and others.

Short list of features:
- supports /proc/net/dev, netstat, getifaddr, sysctl, kstat, /proc/diskstats 
  /proc/partitions, IOKit, devstat and libstatgrab
- unlimited number of interfaces/devices supported
- interfaces/devices are added or removed dynamically from list
- white-/blacklist of interfaces/devices
- output of KB/s, Kb/s, packets, errors, average, max and total sum
- output in curses, plain console, CSV or HTML
- configfile

This was influenced by the old bwm util written by written by Barney
( which had some issues with faster interfaces and 
was very simple. Since i had almost all code done anyway for other projects, 
i decided to create my own version.

I actually dont know if netstat input is usefull at all. I saw this elsewhere,
so i added it. Its target is "netstat 1.42 (2001-04-15)" linux or 
Free/Open/NetBSD. If there are other formats i would be happy to add them.

For info about libstatgrab please refer to

Supported Platforms

network routines sucessfully tested on:
Linux 2.4*, Linux 2.6*
FreeBSD 4.8, 5.3, 6.2*
MacOS X 10.1 and above*
Solaris 10 x86*
SunOS 5.9 sparc Solaris 9
OpenBSD 3.4, 3.6, 4.0*
NetBSD 1.6.1, 2.0, 3.0*
IRIX64 6.5
Win2000, WinXP, Windows Vista

*disk monitoring working aswell

please email me of working or not working platforms. Disk IO might work only on a limited 
number of platforms.


Autotools are used to build this. Run the to generate the configure script. 

For detailed decription please read INSTALL
./configure --help for a list of options


to install use as root: 
make install


To compile the Windows version in Linux (debian): 
./configure --with-win32 --without-procnetdev --without-diskstats --without-curses --without-netstatlinux --build i686-pc-linux-gnu --host i586-mingw32msvc

get ansi.sys for better output:


csv output format: 
Type rate:
unix timestamp;iface_name;bytes_out/s;bytes_in/s;bytes_total/s;bytes_in;bytes_out;packets_out/s;packets_in/s;packets_total/s;packets_in;packets_out;errors_out/s;errors_in/s;errors_in;errors_out\n
Type svg, sum, max:
unix timestamp;iface_name;bytes_out;bytes_in;bytes_total;packets_out;packets_in;packets_total;errors_out;errors_in\n
Use --count 0 to skip the all zero output after start.

html output format:
edit the bwm-ng.css to modify the output. Please note the htmlrefresh only 
modifies the META refresh, you maybe wanna sync --timeout and --htmlrefresh


Please read the manpage or `bwm-ng -h` for a list and explanation of options.

Keybindings (curses only):
  'h'     show help
  'q'     exit
  '+'     increases timeout by 100ms
  '-'     decreases timeout by 100ms
  'k','d' switch KB and auto assign Byte/KB/MB/GB
  'a'     cycle: show all interfaces, only those which are up, 
                 only up and not hidden
  's'     sum hidden ifaces to total aswell or not
  'n'     cycle: input methods
  'u'     cycle: bytes,bits,packets,errors
  't'     cycle: current rate, max, sum since start, average for last 30 sec


either via cmdline or /etc/bwm-ng.conf or ~/.bwm-ng.conf
it consists of:
with 1 or 0 as values for keys without a value in cmdline options.

For more help take a look at bwm-ng.conf-example


Bugs/Known Problems:
  - curses output coredumps on netbsd 1.6.1 (maybe others) with unknown TERM
    set and configfile support compiled in
  - no other yet, wow ;) (please report if you found one)
  - Docs
  - checking options to be valid
  - mysql output (ipac-ng compatible)
  - setting which stats to output for csv/sql
  - distributed gathering of stats (client/server)
  - whatever you can think of

 *  This program is free software; you can redistribute it and/or modify      *
 *  it under the terms of the GNU General Public License as published by      *
 *  the Free Software Foundation; either version 2 of the License, or         *
 *  (at your option) any later version.                                       *
 *                                                                            *
 *  This program is distributed in the hope that it will be useful,           *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of            *
 *  GNU General Public License for more details.                              *
 *                                                                            *
 *  You should have received a copy of the GNU General Public License         *
 *  along with this program; if not, write to the Free Software               *
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA *