Free packet loss software for linux

aircrack is a 802.11 sniffer and WEP/WPA key cracker.
It consists of: airodump (an 802.11 packet capture program), aireplay (an 802.11 packet injection program), aircrack (static WEP and WPA-PSK cracking), and airdecap (decrypts WEP/WPA capture files).
Enhancements:
- airodump: show probing clients as "not associated"
- airodump: dont substract the noise level unless madwifi
- airodump: fixed channel hopping with old orinoco
- airmon.sh: added detection of the zd1211 driver

raddump interprets captured RADIUS packets to print a timestamp, packet length, RADIUS packet type, source and destination hosts and ports, and included attribute names and values for each packet.
Enhancements:
- Added support for IEEE 802.1q tagged VLAN frames.

The SR-RTP library enables real-time streaming applications (such as streaming MPEG-4 video) to cope with packet loss, variable bandwidth, and variable delay on the Internet.

It provides a means for selective retransmission of lost packets in a fashion that is backwards-compatible with RTP. Additionally, it provides integration with the Congestion Manager to provide a system capable of performing TCP- friendly streaming of real-time data.

Installation:

The `configure shell script attempts to guess correct values for various system-dependent variables used during compilation.

It uses those values to create a `Makefile in each directory of the package. It may also create one or more `.h files containing system-dependent definitions.

Finally, it creates a shell script `config.status that you can run in the future to recreate the current configuration, a file `config.cache that saves the results of its tests to speed up reconfiguring, and a file `config.log containing compiler output (useful mainly for debugging `configure).

If you need to do unusual things to compile the package, please try to figure out how `configure could check whether to do them, and mail diffs or instructions to the address given in the `README so they can be considered for the next release.

If at some point `config.cache contains results you dont want to keep, you may remove or edit it.

The file `configure.in is used to create `configure by a program called `autoconf. You only need `configure.in if you want to change it or regenerate `configure using a newer version of `autoconf.

The simplest way to compile this package is:

1. `cd to the directory containing the packages source code and type `./configure to configure the package for your system. If youre using `csh on an old version of System V, you might need to type `sh ./configure instead to prevent `csh from trying to execute
`configure itself.

Running `configure takes awhile. While running, it prints some messages telling which features it is checking for.

2. Type `make to compile the package.

3. Optionally, type `make check to run any self-tests that come with the package.

4. Type `make install to install the programs and any data files and documentation.

5. You can remove the program binaries and object files from the source code directory by typing `make clean. To also remove the files that `configure created (so you can compile the package for a different kind of computer), type `make distclean.

There is also a `make maintainer-clean target, but that is intended mainly for the packages developers. If you use it, you may have to get all sorts of other programs in order to regenerate files that came with the distribution.

nf-HiPAC is a full featured packet filter for Linux which demonstrates the power and flexibility of HiPAC. HiPAC is a novel framework for packet classification which uses an advanced algorithm to reduce the number of memory lookups per packet. nf-hipac package is ideal for environments involving large rulesets and/or high bandwidth networks.

nf-HiPAC provides the same rich feature set as iptables, the popular Linux packet filter. The complexity of the sophisticated HiPAC packet classification algorithm is hidden behind an iptables compatible user interface which renders nf-HiPAC a drop-in replacement for iptables. Thereby, the iptables semantics of the rules is preserved, i.e. you can construct your rules like you are used to. From a users point of view there is no need to understand anything about the HiPAC algorithm.

The nf-hipac userspace tool is designed to be as compatible as possible to iptables -t filter. It even supports the full power of iptables targets, matches and stateful packet filtering (connection tracking) besides the native nf-HiPAC matches. This makes a switch from iptables to nf-HiPAC very easy. Usually it is sufficient to replace the calls to iptables with calls to nf-hipac for your filter rules.

Why another packet filter?

Performance:

iptables, like most packet filters, uses a simple packet classification algorithm which traverses the rules in a chain linearly per packet until a matching rule is found (or not). Clearly, this approach lacks efficiency. As networks grow more and more complex and offer a wider bandwidth linear packet filtering is no longer an option if many rules have to be matched per packet. Higher bandwidth means more packets per second which leads to shorter process times per packet. nf-HiPAC outperforms iptables regardless of the number of rules, i.e. the HiPAC classification engine does not impose any overhead even for very small rule sets.

Scalability to large rulesets:

The performance of nf-HiPAC is nearly independent of the number of rules. nf-HiPAC with thousands of rules still outperforms iptables with 20 rules.

Dynamic rulesets:

nf-HiPAC offers fast dynamic ruleset updates without stalling packet classification in contrast to iptables which yields bad update performance along with stalled packet processing during updates.

The fairly fast packet filter (FFPF) is an approach to network packet processing that adds many new features to existing filtering solutions like BPF.
fairly fast packet filter is designed for high speed by pushing computationally intensive tasks to the kernel or even network processors and by minimising packet copying.
By providing both access to richer programming languages and explicit extensibility, it is also considerably more flexible than existing approaches.
FFPF provides a complete solution for network monitoring that caters to all applications available today. Exploiting its extensibility, the language can even be used as a meta-filter to `script together filters from other approaches, such as BPF.
Main features:
- fast: processes significantly more packets per second than LSF (reference)
- scalable: transparently supports hardware assist, like that given by the Intel IXP2x00 network processors
- backward compatible: supports all existing libpcap based applications
- extensible: separates functionality from the framework. FFPF currently ships with implementations of BPF, Aho Corasick, Boyer Moore Horspool, and many more
- modular: new functions can be written in as little as 3 lines of code
- secure: relies on Keynote for authentication and resource control
- open and standard adherent: licensed under the GNU General Public License (GPL). It implements the Monitoring API (MAPI) draft as designed by the EU-SCAMPI consortium
Enhancements:
- enabled kernelspace processing
- enabled all 5 buffer implementations (Continuous, Fixed-size slot, Variable sized slot, Double ring and Index)
- added TCP stream reassembly and early implementation of zero-copy reassembly
- added PCAP input and output support, for userspace testing and offline use
- added additional minor functions: TCP Synprotect, output to files, ...
- added support for UDEV
- extended controlplane: flowspaces can now be queried for live state
- fixed up many bugs, hacks and irregularities.

pyrad is a Python RADIUS client.

pyrad contains several modules:

pyrad.client
RADIUS client class.
pyrad.dictionary
RADIUS dictionary support. Supports standard radiusd dictionaries and has preliminary support for the freeradius octets and abinary extensions.
pyrad.packet
A packet with a RADIUS request or reply. A packet object takes care of all the necessary data conversion allowing the programmer to only use standard python data types and RADIUS attribute names.
pyrad.server
Basic RADIUS server and proxy classes.
pyrad.tools
Utility functions, mostly used internally for data conversion

Simple example

Below is a simple example of how to use pyrad; it shows how to do an authentication request.

import pyrad.packet
from pyrad.client import Client
from pyrad.dictionary import Dictionary

srv=Client(server="radius.my.domain", secret="s3cr3t",
dict=Dictionary("dicts/dictionary", "dictionary.acc"))

req=srv.CreateAuthPacket(code=pyrad.packet.AccessRequest,
User_Name="wichert", NAS_Identifier="localhost")
req["User-Password"]=req.PwCrypt("password")

reply=srv.SendPacket(req)
if reply.code==pyrad.packet.AccessAccept:
print "access accepted"
else:
print "access denied"

print "Attributes returned by server:"
for i in reply.keys():
print "%s: %s" % (i, reply[i])

Berkley Snoop for Linux is a module which adds support for the Snoop protocol, a TCP-aware link layer protocol designed that can improve the performance of TCP over networks of wired and single-hop wireless links.
While TCP adapts well to network congestion, it does not adequately handle the vagaries of wireless media. In this thesis, we address these challenges in detail and design solutions to them. These solutions incorporate link-layer techniques as well as enhancements to TCP at the sender and receiver. The Snoop protocol is a TCP-aware link layer protocol designed to improve the performance of TCP over networks of wired and single-hop wireless links.
The implementation is for kernels of 2.6.x series. This software is intended to use on routers acting between big fat pipe(BFP) link and wireless link.
The problem: The wireless link is error prone by its nature and BFP links such as satellite one has very big round-trip time. When error occurs on wireless segment it causes in speed reduction because the TCP protocol on sending side treats this error as link congestion although the error was just a temporary link quality loss and the connection cannt recover its speed.
The fix: The module will cache TCP segmets passing to host on wireless segment until the ACK(nowledgmet) is received or timeout expired. In case of timeout the segment will be retransmitted again. And by the way the module will drop all DUP(licate) ACK(nowledgmets) caused by packet loss on wireless segment and prevent the reduction of speed of flow from the host beyond the satellite link. The module works now only with connections initiated from wireless hosts.
Enhancements:
- fixed issues with improper use of locks & memory allocation the memory allocates now with GFP_ATOMIC priority

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