Free bandwidth usage software for linux

Bandwidth Check is a small utility that helps an administrator measure the available bandwidth. In order to make use of this utility, you will need to turn on the chargen service, which is provided in many inetd implementations.

In order to make use of this utility, you will need to turn on chargen protocol.

To enable chargen on Linux:

create the following file /etc/xinetd.d/charge
service chargen
{
type = INTERNAL
id = chargen-stream
socket_type = stream
protocol = tcp
user = root
wait = no
disable = no
}
service xinetd restart

To Compile bwcheck

gcc -o bwcheck bwcheck.c

To execute

./bwcheck

./bwcheck 172.16.11.2
Throughput: 73390.74 kb

IP Bandwidth Watchdog (ipband) is a pcap based IP traffic monitor. It tallies per-subnet traffic and bandwidth usage and starts detailed logging if specified threshold for the specific subnet is exceeded. If traffic has been high for a certain period of time, the report for that subnet is generated which can be appended to a file or e-mailed. When bandwidth usage drops below the threshold, detailed logging for the subnet is stopped and memory is freed.

This utility could be handy in a limited bandwidth WAN environment (frame relay, ISDN etc. circuits) to pinpoint offending traffic source if certain links become saturated to the point where legitimate packets start getting dropped.

It also can be used to monitor internet connection when specifying the range of local ip addresses (to avoid firing reports about non-local networks).

Bandwidth Monitor NG is a small and simple console-based live bandwidth monitor.
I have sucessfully tested on (if you have any other sucessfull or unsucessfull, please mail me):
Linux 2.4, Linux 2.6
FreeBSD 4.8, 5.3
MacOS X 10.1, 10.2, 10.3
Solaris 10 64bit x86
SunOS 5.9 sparc Solaris 9
OpenBSD 3.4, 3.6
NetBSD 1.6.1, 2.0
IRIX64 6.5
Main features:
- supports /proc/net/dev, netstat, getifaddr, sysctl, kstat and libstatgrab
- unlimited number of interfaces supported
- interfaces are added or removed dynamically from list
- white-/blacklist of interfaces
- output of KB/s, Kb/s, packets, errors, average, max and total sum
- output in curses, plain console, CSV or HTML
- configfile
Enhancements:
- Changes in this release include curses2 output (a nice bar chart), disk input for BSD, Mac OS X, Linux, and Solaris, Win32 network bandwidth support, use of autotools, and lots of fixes.

ADSL Bandwidth Management HOWTO project describes how to manage outbound traffic on an ADSL modem.
Emphasis is placed on lowering the latency for interactive traffic even when the upstream and/or downstream bandwidth is fully saturated.
The purpose of this document is to suggest a way to manage outbound traffic on an ADSL (or cable modem) connection to the Internet. The problem is that many ADSL lines are limited in the neighborhood of 128kbps for upstream data transfer.
Aggravating this problem is the packet queue in the ADSL modem which can take 2 to 3 seconds to empty when full. Together this means that when the upstream bandwidth is fully saturated it can take up to 3 seconds for any other packets to get out to the Internet.
This can cripple interactive applications such as telnet and multi-player games.
Enhancements:
- Added links section

As the name already suggests, ncdu is an NCurses version of the famous old du unix command.

NCurses Disk Usage provides a fast and easy interface to your harddrive. Where is your disk space going? Why is your home directory that large? ncdu can answer those questions for you in just a matter of seconds!

Bandwidth Meter and Diagnostics is a Firefox extension that will automatically check whether Internet connection is working or not when a website can not be loaded, and a list of tools for network troubleshooting. Try to type a random domain name(e.g., qwqwqwq121212.com) to see what this means ...
This extension adds "Bandwidth Meter" to the Tools Menu. It performs the following tasks:
- Display your public IP address
- Display your public domain name
- Test download speed/bandwidth
- Test upload speed/bandwidth
This extension runs under any OS. If you use Windows, you could try our other Windows specific extension "Broadband Speed test and Diagnostics" that has extra features and can only run under Windows. We are creating this because we get many requests from non-windows users.

Example NAT usage is a little script to show a NAT usage example.

Sample:

#----------------------#
# Variable Definitions #
#----------------------#

EXT=eth0
INT=eth1

# "Masquerading" Example
PRIV_NETS="128.111.1.1 128.111.185.0/255.255.255.0"
MASQ_NET=192.168.1.0/255.255.255.0

# "General SNAT" Example
MAP_FROM=192.168.1.0/255.255.255.0
MAP_TO=128.111.185.30-128.111.185.42

# "Redirection" Example
INTERNAL_IP=10.10.1.1

# "Port Forwarding" Example
EXTERNAL_IP=128.111.1.200
NEWS_SERVER=10.10.1.38
MAIL_SERVER=10.10.1.69

# "Load Balancing" Example
VIRTUAL_SERVER=news.sblug.com
SERVER_RANGE=10.10.1.9-10.10.1.15

#-------------#
# NAT Section #
#-------------#

#
# Flush previous rules
#

iptables -t nat -F


#
# Masquerading
#

# Masquerading for outgoing connections, except privileged nets are exempt
for NET in $PRIV_NETS ; do
iptables -t nat -A POSTROUTING -d $NET -o $EXT -j ACCEPT
done
iptables -t nat -A POSTROUTING -s $MASQ_NET -o $EXT -j MASQUERADE


#
# General SNAT
#

# Internal computers w/ private ips "borrow" public ips of other internal computers to ssh out
iptables -t nat -A POSTROUTING -s $MAP_FROM -o $EXT -p tcp --dport ssh -j SNAT --to-source $MAP_TO
iptables -t nat -A POSTROUTING -s $MAP_FROM -o $EXT -p udp --dport ssh -j SNAT --to-source $MAP_TO


#
# Redirection
#

# Redirect internal net http traffic through squid proxy, but allow direct access to local web server
iptables -t nat -A PREROUTING -i $INT -d ! $INTERNAL_IP -p tcp --dport www -j REDIRECT --to-port 8080


#
# Port Forwarding
#

# Forward gateway port 7000 to news server and gateway port 8000 to pop mail server
iptables -t nat -A PREROUTING -d $EXTERNAL_IP -p tcp --dport 7000 -j DNAT --to-dest $NEWS_SERVER:nntp
iptables -t nat -A PREROUTING -d $EXTERNAL_IP -p tcp --dport 8000 -j DNAT --to-dest $MAIL_SERVER:pop3

#
# Load Balancing
#

# Basic load balancing by redirecting nntp requests to any of several local news servers
iptables -t nat -A PREROUTING -d $VIRTUAL_SERVER -p tcp --dport nntp -j DNAT --to-dest $SERVER_RANGE