Free line packet loss testing software for linux

Layer-7 Packet Classifier for Linux is a packet classifier for Netfilter that identifies packets based on application layer (OSI layer 7) data. This means that it is able to classify packets as HTTP, FTP, Gnucleus, Kazaa, etc., regardless of ports.
It complements existing matches that classify based on port numbers, packet length, TOS bits, and so on. Combined with Linux QoS, it allows for full layer 7 packet shaping.
Main features:
- Patches for Linux 2.4 and 2.6
- Support for TCP, UDP and ICMP over IPv4
- Uses Netfilters connection tracking of FTP, IRC, etc
- Examines data across multiple packets
- Number of packets examined tunable on the fly through /proc
- Number of bytes examined tunable at module load time
- Distinguishes between new connections (those still being tested) and old unidentified connections
- Gives access to both Netfilter and QoS (rate limiting) features
- With the Netfilter "helper" match, you can distinguish between parent and child connections (e.g. ftp command/data)

Aps is a small tool for analyzing network traffic. It prints out a great deal of information about the relevant protocols including TCP, UDP, ARP, and ICMP.
It allows you to filter IP addresses, hardware addresses, ports, and specific protocols. It comes with a little GTK-GUI displaying packet counters for each protocol.
APS tries to print detailed info about network frames that are received from the SOCK_RAW (ETH_P_ALL) socket. I am not sure if this is the clean way, but it works fine. APS prints info about the hardware layer and the IP and TCP/UDP/ICMP header.
The tail of the packet (mostly the data) wich could not be interpreted is written on the screen as ascii/hex-dump or both (your choice).
Example
HW-ADDR: 00:60:8c:f6:40:96 -----> 00:80:ad:30:8f:3b
IP-ADDR: 192.168.17.52 -----> 192.168.17.50
IP-Ver4 || Head:0x0a (bytes) || Service(TOS):16 || Length over all:0061
Fragmentation: ID:0x4079 - Flags: 0 1 0 - Offset:00000
TTL:064 || Protokoll:006 (TCP) || HeaderCRC:0x567b
TCP-HEADER:
Ports: 0023-->1034 (telnet) Seq./Ack. Nr.:0x70843468 / 0xeae29434
Data-Offset:0x05 Reserved-6Bit:00 Flags:-urg-ACK-PSH-rst-syn-fin-
Window:0x7fe0 CRC:0x9420 Urgent-Pointer:0x0000
73 61 74 75 72 6e 32 3a 2f 73 72 76 2f 70 72 69 6e 74 71 23 20
HW-ADDR: 52:54:40:25:8d:88 -----> ff:ff:ff:ff:ff:ff
SAMBA/NetBios
e0 e0 03 ff ff 00 22 00 11 00 00 00 00 ff ff ff ff ff ff 04 52 00 00 00 00 52
40 25 8d 88 40 08 00 03 00 04 20 20 20 20 20 20 20 20 20
HW-ADDR: 00:80:ad:30:8f:3b -----> 00:60:8c:f6:40:96
IP-ADDR: 192.168.17.50 -----> 194.112.123.200
IP-Ver4 || Head:0x0a (bytes) || Service(TOS):0 || Length over all:0029
Fragmentation: ID:0x29ae - Flags: 0 0 0 - Offset:00000
TTL:064 || Protokoll:001 (ICMP) || HeaderCRC:0x411f
echo request CODE:0x0 CRC:0xf9f5 SIG:0x602 NUM:0x0
00 ea
Enhancements:
- added break for Packet-counter and fixed some minor bugs

IP and Ethernet testing Tool is also known as "IET" and its an ethernet bridge addon for testing of network appliances and applications.
Initialy IskraTel extended and customized the NistNet tool.
However NistNet functions on IP layer and requires that tested equipment be configured to use different subnets and gateways.
Nistnet main purpose was internet emulation while IET main purpose is testing of communication equipment.
Main features:
- no need to reconfigure equipment, just insert a PC with two NICs "on the cable"
- works on the ethernet level with a bridge
- network error conditions:
- packet loss
- delay
- in transmission errors (IP, UDP layer)
- bandwidth restraints
- kernel driver for low-CPU overhead packet processing
- control application for configuring driver engine
- GUI
- CLI
- saving configuration to a text file
Enhancements:
- Fixed support for matching ethernet packets based on the protocol
- Added additional matches for ICMP, TCP and UDP protocols (ICMP Type, TCP/UDP src port and dst port)
- Added target for corruption of IP and UDP packets with optional checksum update.
- Numerous small bug-fixes and enhancements
- IET has entered feature-freez and until version 1.0.0 is released there will be only bugfixes

Packet Construction Set is a set of Python modules and objects that make building network protocol code easier for the protocol developer.
The core of the system is the pcs module itself which provides the necessary functionality to create classes that implement packets.
Installation Instructions for Packet Construction Set (PCS)
PCS follows the normal Python conventions for building and installing and there is very little, if any, magic. To install the library and the associated packet classes into your system do:
> python setup.py install < return >
To test your installation do:
> cd tests/ < return >
> python *.py
Some tests fail if you do not have enough privileges to work with the Berkeley Packet Filter. If you wish to run those tests run them using sudo.
To build the documentation you will need pdflatex and a BSD version of make installed. Go into the docs directory and build the documentation:
> cd docs/ < return >
> bsdmake all
you will see PDF versions of the docs.
Enhancements:
- Move my version of Doug Songs Python pcap library into the package.
- Update the Makefile to make sure that we install correctly no matter what target is selected.

Online Cardgame System project is a client-server system for playing card games over the net.
OCS is a client-server cardgame system, similar to those found at Yahoo! Games and elsewhere. The server is portable and has been tested under Linux, Win32, and several unix systems. We currently have Win32 and Java clients available, and a Qt client for Linux is in development.
Games are implemented as plugin modules, so new games can be added without recompiling the server. In addition, the client is written to be unaware of the mechanics of gameplay, so it can theoretically play any games the server supports without having to know how to play them specifically.
We currently have Euchre and Spades implemented, with bot support for both games, meaning you dont need a full 4 people to play a game. We plan on implementing more games in the future.
On a side note, development of this project tends to wax and wane with our motivation and amount of schoolwork.
Enhancements:
- Massive restructure of code into more object orientated patterns
- Added daemon capability to server
- Got rid of checksumming in the protocol since TCP/IP does it internally
- Padded STRINGS in the protocol on DWORD boundaries
- Added support for loadable account managers
- Removed crypting of the password by ocsd (account managers may do it)
- Added ODBC (for windows) and mySQL (for unix) account managers (database connectivity!!)
- Modified packet classes to throw exceptions instead of returning true-false
- Created packet manager classes to queue client packets, reduces total send calls
- Implemented bots when there arent enough people to play games
- Added new command line processing capabilities as well as configuration file support
- Fixed bug that allowed a person to overwrite an account when creating that same account
- Win32 - Made server link with DLL runtime library to reduce executable size and ease DLL dependencies
- Updated messages to be sent in HTML since the main clients support it
- Created Java client which can be run as an application or as an applet
- After a client is booted from a game, they cannot join the game again until they receive an invitation
- Fixed libtidy bug which caused it to erroneously format HTML
- Euchre supports intelligent bots
- Spades supports moronic bots (the AI is horrible but allows for gameplay)
- Fixed Spades textual problem when a round was over.
- Fixed Spades score calculation that resulted in no loss of points
- Win32 client now supports HTML (IE4+ required)
- Win32 client can now join games by right-clicking on an empty game slot in the game view.
- Fixed major bug in Win32 client that would cause it to crash when sending private messages
- Win32 client can now use /msg to send private messages

The Firewall Tester (FTester) is a tool designed for testing firewalls filtering policies and Intrusion Detection System (IDS) capabilities.The tool consists of two perl scripts, a packet injector (ftest) and the listening sniffer (ftestd). The first script injects custom packets, defined in ftest.conf, with a signature in the data part while the sniffer listens for such marked packets. The scripts both write a log file which is in the same form for both scripts. A diff of the two produced files (ftest.log and ftestd.log) shows the packets that were unable to reach the sniffer due to filtering rules if these two scripts are ran on hosts placed on two different sides of a firewall. Stateful inspection firewalls are handled with the connection spoofing option. A script called freport is also available for automatically write to log files.
Of course this is not an automated process, ftest.conf must be crafted for every different situation. Examples and rules are included in the attached configuration file.
The IDS (Intrusion Detection System) testing feature can be used either with ftest only or with the additional support of ftestd for handling stateful inspection IDS, ftest can also use common IDS evasion techniques. Instead of using the configuration syntax currently the script can also process snort rule definition file.
These two scripts were written because I was tired of doing this by hand (with packet-crafting tools and tcpdump), I know that there are at least two dozens of other methods to do this but another reason was to learn some perl ;). I hope that you enjoy them.
Main features:
- firewall testing
- IDS testing
- simulation of real tcp connections for stateful inspection firewalls and IDS
- connection spoofing
- IP fragmentation / TCP segmentation
- IDS evasion techniques

Packet Excalibur is a multi-platform graphical and scriptable network packet engine with extensible text-based protocol descriptions. It is a network tool designed to build and receive custom packets from network.

Pen testing firewalls, routers, or any network enable equipment. Validating your custom built protocols without the burden of writting lines of code. Teaching yourself how protocols works and articulates around each other.

Download the install package (PacketExcalibur_*.*_linux_tgz)

Unzip and untar the archive, run "make" in the "PacketExcalibur_*/main" directory,
- binaries are installed in /usr/sbin
- support packages are installed in /var/cache/excalibur
- preference file is created in the user home directory