UDP, the User Datagram Protocol, is often used by applications that prefer to avoid the overhead of establishing a TCP connection (such as DNS, NFS, TFTP), or those that can tolerate occasional errors in the interest of efficiency (such as streaming audio or video). UDP is given the Internet protocol number of 17 and is [...]

Well, This is our first video, we hope you will like, is a 30 minutes lenght video, spoken (sorry) in english, where we try to teach you how to attack a WEP Shared Key 256 bit wireless. Remember to update your aircrack-ng suite inside you will find the instructions. ENJOY!! 256 bit Wep Shared key DEFEATED! The video

The standard TCP header is defined in RFC 791 and illustrated in Figure 2-5. It consists of a minimum of 20 bytes and a maximum of 60 bytes. The application-specific information, which is delivered to the application program, is located inthe data portion of the TCP packet.   The TCP header consists of the following fields: Source port [...]

TCP, the Transmission Control Protocol, can rightly lay claim to being the crown jewel of the IP protocol suite it is by ar the most widely used protocol, as well as the one that is responsible for carrying the majority of the Internet’s useful ontent. TCP adds to the best-effort delivery capabilities of IP. TCP Reliable [...]

It would be desirable for systems to determine the maximum MTU they could use in communications to avoid the overhead of fragmentation. According to RFC 791, all devices talking to IP must support a minimum MTU of 68 bytes, so fragmentation can be avoided by transmitting IP packets of 68 bytes which allows for an [...]

The IP Header The standard IP header is defined in RFC 791. It consists of a minimum of 20 bytes and ranges up to a maximum of 60 bytes. Embedded in the data portion of the IP packet is the protocol-specific packet (such as a TCP or UDP packet). These are the header fields: Version number A 4-bit field [...]

Although the OSI model is useful for understanding and describing the network functions that apply during communication, the IP suite of protocols does not conform to the model described by OSI. It was developed independently of OSI, and the IP designers used the simpler conceptual model . Generally, TCP/IP networking is split into four categories: Network [...]

 Intrusion-Detection and Intrusion-Prevention MythsThere are several untrue intrusion-detection and intrusion-prevention myths. These assertions repeatedly come up, even though some are diametrically opposed to others. Myth 1: Intrusion detection and intrusion prevention are basically the same technology. Many believe that because some IDS systems have TCP kill and RESET capabilities that they are pretty much the same [...]

As a consequence of the Internet’s explosion of popularity, most networking protocols that competed with IP, the Internet Protocol, have been relegated to niche status, or have been made to work with IP (such as NBT, which is NetBIOS running under TCP, the Transmission Control Protocol). The IP family of protocols has been designed to provide [...]

Profile-Based Detection (Anomaly Detection)An anomaly is something that is different from the norm or that cannot be easily classified. Anomaly detection, also referred to as profile-based detection, creates a profile system that flags any events that strays from a normal pattern and passes this information on to output routines. One key distinction between anomaly detection and [...]

There are many possible data-analysis schemes for an analysis engine, and in order to understand them, the intrusion-analysis process can be broken down into four phases:  Preprocessing 1. Analysis 2. Response 3. Refinement 4. Preprocessing is a key function once data are collected from an IDS or IPS sensor. In this step, the data are organized in some fashion for [...]

Rule-Based Detection (Misuse Detection) Rule-based detection, also referred to as signature detection, pattern matching and misuse detection, is the firstscheme that was used in early intrusion-detection systems. Rule-based detection uses pattern matching to detectknown attack patterns. Let’s look at how the four phases of the analysis process are applied in a rule-based detection system:   Preprocessing The first step [...]

Profile-Based Detection (Anomaly Detection)  An anomaly is something that is different from the norm or that cannot be easily classified. Anomaly detection, alsoreferred to as profile-based detection, creates a profile system that flags any events that strays from a normal patternand passes this information on to output routines. One key distinction between anomaly detection and other analysis [...]

There are many possible data-analysis schemes for an analysis engine, and in order to understand them, the intrusion-analysis process can be broken down into four phases:  Preprocessing 1.  Analysis 2.  Response 3.  Refinement 4. Preprocessing is a key function once data are collected from an IDS or IPS sensor. In this step, the data are organized in some fashion for [...]

Intrusion-Detection and Intrusion-Prevention MythsThere are several untrue intrusion-detection and intrusion-prevention myths. These assertions repeatedly come up, even though some are diametrically opposed to others. Myth 1: Intrusion detection and intrusion prevention are basically the same technology. Many believe that because some IDS systems have TCP kill and RESET capabilities that they are pretty much the same [...]

IDSs and IPSs are important for many organizations, from small offices to large multinational corporations.IDSs and IPSs offer many benefits: Greater proficiency in detecting intrusions than by doing it manually In-depth knowledge bases to draw from Ability to deal with large volumes of data Near real-time alerting capabilities that help reduce potential damages Automated responses, such as logging off a [...]

Analysis, in the context of intrusion detection and prevention, is the organization of the constituent parts of data and their interrelationships to identify any anomalous activity of interest. Real-time analysis is analysis done on the fly as the data travels the path to the network or host. This is a bit of a misnomer, however, [...]

Intrusion-prevention technology is fairly new and is still evolving, whereas intrusion detection has a bit more history behind it. However, both IDS and IPS have their roots in auditing. In 1980, James Anderson wrote a technical report called Computer Security Threat Monitoring and Surveillance for the U.S. Air Force. The paper showed that audit records could be used [...]

IDS/IPS Pros and ConsAs stated earlier, IDS and IPS are two separate technologies that can complement each other. The following sections list the pros and cons of both technologies. Intrusion Detection The pros of intrusion detection include the following: Can detect external hackers as well as internal network-based attacks Scales easily to provide protection for the entire network Offers centralized [...]

It is still early in the development of intrusion-prevention systems (IPSs), but generally an IPS sits inline on the network and monitors it, and when an event occurs, it takes action based on prescribed rules. This is unlike IDSs, which do not sit inline and are passive. Some people see IPSs as next-generation IDS systems, because they [...]