Harrykar's Techies Blog

File Transfer trough Netcat

2011-10-11T10:11:00.131+02:00

under revision... The flexibility and simple operation allows Netcat to fill a niche when it comes to moving a file or files in a quick and easy fashion. Encryption is provided via several different avenues including integrated support on some of the more modern Netcat variants, tunneling via third-party tools, or operating system integrated IPsec policies. After the file is transferred, any of

Netcat the Network Swiss Army knife

2011-10-07T18:14:00.079+02:00

A must have tool IndexOverview My Anti-virus said Netcat was a Trojan! Netcat’s CLIENT/SERVER MODEL and Modes Netcat's common commands Redirection operators Basic use of Netcat Simple Chat Interface Remote teminal Port Scanning Transferring Files Netcat Vs FTP Cloning Hard Drives & Partitions Serving Web Pages Spoofing HTTP Headers Anonymize netcat Resources OverviewNetcat was originally

Gnunet: usage

2011-08-21T13:01:00.003+02:00

d Gnunet's comands Codice: $ apropos gnunet gnunet-arm (1) - control GNUnet services gnunet-directory (1) - display directories gnunet-download (1) - a command line interface for downloading files from GNUnet gnunet-gtk (1) - a gtk interface for accessing GNUnet gnunet-monkey (1) - automatically debugging for services gnunet-nat-server (1) - help GNUnet setup test network

Gnunet: decentralized, P2P, anonymous, censorship-resistant file-sharing

2011-08-13T15:48:00.005+02:00

At the beginning of 2002 we used Kazza Lite for p2p file sharing. Until we heard many people reported about viruses on Kazza lite, we stop using Kazza lite and start to migrate to another free p2p file sharing network. On the middle of 2005 we start to use torrent but at the end of 2006 our Internet Administrator do many rule modification including blocking torrent and other p2p sharing

ARP protocol internals

2011-07-16T11:36:00.017+02:00

ARP is a basic protocol in almost every TCP/IP implementation, but it normally does its work without the application or the system administrator being aware. The ARP cache is fundamental to its operation, and we've used the arp(8) command to examine and manipulate the cache(The arp command displays and modifies entries in the ARP cache). Each entry in the cache has a timer that is used to

Computer Networks Performance

2011-04-19T19:10:00.073+02:00

s Network PerformanceUp to this point (Computer Network Architecture , Computer Network Implementing Software), we have focused primarily on the functional aspects of networks. Like any computer system, however, computer networks are also expected to perform well, since the effectiveness of computations distributed over the network often depends directly on the efficiency with which the network

Computer Network Implementing Software

2011-04-19T10:30:00.062+02:00

f Implementing SoftwareNetwork architectures and protocol specifications are essential things, but a good blueprint is not enough to explain the phenomenal success of the Internet: The number of computers connected to the Internet has been doubling every year since 1981 and is now approaching the impressive number of 1,966,514,816; It is believed that the number of bits transmitted over the

Computer Network Architecture

2011-04-18T13:51:00.267+02:00

k To help deal with complexity, network designers have developed general blueprints—usually called a network architecture—that guide the design and implementation of networks. Here we introducing the central ideas that are common to all network architectures. It also introduces two of the most widely referenced architectures— the OSI architecture and the Internet architecture. Layering and

Computer Networks Requirements

2011-04-13T21:45:00.185+02:00

ARPAnet's Requirements To fulfill the needs of the military, the new ARPAnet had to meet the following requirements: No one point more critical than any other Because the network needed to be able to withstand a nuclear war, there could be no one critical part of the network and no single point of failure. If there were any critical parts of the network, enemies could target that area and

Domain Name System Alias DNS

2011-04-10T12:30:00.020+02:00

b DNS: The Most famous Support application-layer Protocol There are several applications in the application layer of the Internet model that follow the client/server paradigm. The client/server programs can be divided into two categories: those that can be directly used by the user, such as e-mail, and those that support other application programs. The Domain Name System (DNS) is a supporting

The World Wide Web: HTTP

2011-04-08T13:19:00.533+02:00

The World Wide Web (WWW) is a repository of information linked together from points all over the world. The WWW has a unique combination of flexibility, portability, and user-friendly features that distinguish it from other services provided by the Internet. The WWW project was initiated by CERN (European Laboratory for Particle Physics) to create a system to handle distributed resources

irssi + screen setup, features: a recap

2011-03-26T11:14:00.012+01:00

e So...What's it All About? maybe retro-computing?After my newsgroups period (as the main discussion mean because of my ISP costly hourly contract trough a 56 Kbps modem) when Adsl comes here i recap (earlier use it in Uni) with IRC. Irssi was my second textual client after ircII and i love it. The real power of irssi is in his flexibility (alias his config file ~/.irssi/config). Generally

InternetRelayChat IRC in an extensive view

2011-03-21T12:48:00.746+01:00

With a simple, clearly defined protocol, IRC has becomeone of the most accessible chat environments, with clientswritten for a multitude of operating systems. Users of alternative chat systems will find IRC pretty easy to pick up and may even be surprised to find that it is more powerful, allowing not just chat between pairs of users, but among groupsof hundreds, even thousands. It is the

Visible's Web search history

2011-02-11T11:42:00.122+01:00

To understand the Web in the broadest and deepest sense, to fully partake of the vision that I and my colleagues share, one must understand how the Web came to be. —Tim Berners-Lee, Weaving the Web Internet Vs Web“Internet” and “Web”are not synonyms. The Internet is a networking protocol (set of rules) that allows computers of all types to connect to and communicate with other computers on

Bash Bourne Again SHell in UNIX

2011-02-07T08:52:00.075+01:00

"Under Linux there are GUIs (graphical user interfaces), where you can point and click and drag, and hopefully get work done without first reading lots of documentation. The traditional Unix environment is a CLI (command line interface), where you type commands to tell the computer what to do. That is faster and more powerful, but requires finding out what the commands are."

OpenBSD --- Packet Filtering(PF)

2010-07-26T22:43:00.037+02:00

OpenBSD includes a very powerful in-kernel packet filter, pf(4), that not only performs standard stateless and stateful packet filtering, but can also inspect and reassemble packet fragments in several ways, redirect connections, translate addresses in several different directions simultaneously, authenticate users, and manage bandwidth. PF is one of the high points of OpenBSD. PF allows you to

OpenBSD --- An Overview of /etc

2010-07-26T20:33:00.007+02:00

The /etc directory is the heart of any UNIX-like operating system. /etc contains the files that tell the system how it works, what it does, and how it behaves under any circumstances. The first thing one do on any unfamiliar UNIX breed is check out the /etc directory and see what make it tick; it's like kicking the tires and checking under the hood of a used car before taking it for a test drive.

OpenBSD --- How Eliminate Root privilege issues?

2010-07-22T13:42:00.007+02:00

The root password can be a cause of contention in any organization . Many system administrators hate giving it out, even to people who are responsible for maintaining part of the system. If this sort of system administrator doesn't know how to properly manage things, this reluctance can keep people from being able to do their jobs. Many other system administrators hand out root to dang near

OpenBSD --- Installation process

2010-07-17T11:34:00.013+02:00

under revision Using a development version of a OS is sort of like living in a house inhabited by a large family of carpenters and architects: Every morning when you wake up, the house is a little different. Maybe you have a new turret, or some walls have moved. Or perhaps someone has temporarily removed the floor under your bed. About strong cryptography into the base system: OpenBSD can not

FreeBSD --- some common small “helper” services

2010-07-14T10:16:00.012+02:00

d SSHOne of Unix’s great strengths is its ease of remote administration. Whether the server is in front of you or in a remote, barricaded laboratory in a subterranean, maximum-security installation, if you have network access to the machine you can control it just as if you were sitting in front of it. For many years, telnet(1) was the standard way to access a remote server. telnet is nifty. You

FreeBSD --- UPGRADING IT

2010-07-10T12:22:00.024+02:00

Upgrading network servers is perhaps the most annoying task in the system administrator’s routine. I can manage unexplained behavior on my desktop after an upgrade, but when a whole company or hundreds of customers depend on one system, even thinking of touching that system makes my bowels churn. While a few Unix-like systems have straightforward upgrade procedures, they require several

PC-BSD --- Administering it

2010-07-03T10:15:00.005+02:00

i Administrative System SettingsHere i put the focus on the system settings usually performed by the administrative user. Many of these configuration modules will prompt you for the superuser password. We’ll start by finishing up System Settings General tab by discussing the modules in the Network & Connectivity section, as well as the remaining modules in the Computer Administration

PC-BSD --- The KDE4 Desktop Apps and Use (for Dummies)

2010-07-01T08:22:00.060+02:00

The true strength of this environment(KDE) lies in the large suite of applications and interoperability of its components KDE4PC-BSD version 8.0 uses the KDE4 (KDE version 4) desktop environment by default. In Windows, the desktop is part of the operating system. This means that you can customize your desktop, but you can’t install a different desktop. In open source, the desktop is separate

PC-BSD --- PBI system

2010-06-30T21:48:00.004+02:00

PBI system's Software Manager makes it easy to find, install, remove, and update software. Push Button Installer SystemWhat Is a PBI? PBI is the name of the software management system that is unique to PC-BSD. An application that you can install using this software management system is also called a PBI. For example, you might see references to someone installing the Firefox PBI. If you

PC-BSD --- A Intro

2010-06-30T19:00:00.005+02:00

s Getting Started with PC-BSD Did you ever wish that you could just use your computer without becoming frustrated by the experience? How many times have you found yourself asking: why can’t I browse the Internet or use email without worrying about viruses? Why can’t I find software that doesn’t crash or freeze my computer? Why do I have to rely on a technical friend or family member to keep my

PC-BSD --- Installation process easy like Windows? No it's really easier

2010-06-29T12:05:00.039+02:00

PC-BSD was designed to be easy to install. Even if you’ve never installed an operating system before, the default settings provided by the installer will allow for a quick and successful PC-BSD installation. If you have a spare computer and a PC-BSD DVD, you can install and start using PC-BSD in under 45 minutes. You can start with Using the Live DVD. This will enable you to try out PC-BSD

FreeBSD --- Working with files

2010-06-26T11:01:00.041+02:00

Like all multi-user systems, UNIX keeps track of who owns what file and who can do what with each file. Permissions attached to each file and directory determine who can use them Files File types Everything in a BSD(*nix) file system can be viewed as a file. This includes: data files directories devices named pipes links ... and other types of files. Associated with each file is a set of

FreeBSD --- Shell

2010-06-23T17:17:00.079+02:00

d Using the ShellThere are several different shells to choose from on BSD systems. By default, the root user is assigned to use the C shell (csh) and a regular user is assigned the Bourne shell (sh). With Linux systems, most users use what is called the Bourne Again Shell (bash). There are other shells available as well (such as zsh, ksh, or tcsh). Here i will help you use BSD shells, in

FreeBSD --- Packages and Ports

2010-06-22T18:22:00.167+02:00

Adding, Deleting,and Managing SoftwareWith Solaris for example, if you want to add a new piece of the software to the system, you have to find a precompiled binary for your particular platform and install it yourself (usually without the aid of installers that help you put it in the right place), because Solaris typically doesn't come with gcc (the standard GNU C/C++ compiler). Other systems,

FreeBSD --- X Window System

2010-06-22T12:19:00.018+02:00

under editing... Working with the X Window SystemWindow System(also known as X11 or X) is the UNIX world's equivalent of the Windows operating environment. UNIX systems owing to the usual niche of UNIX systems in server roles where a user-friendly application environment is seldom of any use. However, in recent years many people have sought to replace their Windows desktop systems

FreeBSD --- Booting and Shutting Down process

2010-06-21T20:31:00.128+02:00

under editing The FreeBSD Startup ProcessWhen you first start FreeBSD, it prints a flurry of messages on your screen from the kernel and also from the various processes starting up. Note The following sections apply only to FreeBSD running on x86 (Intel) hardware. Although the startup process on Alpha, SPARC, or other platforms is similar, some of the

Ubuntu --- convert file formats

2010-05-17T11:25:00.032+02:00

Convert .chm to .html | .pdfSuppose you want to edit and republish a CHM file into another format. To do so, you first need to extract the original HTML files from the CHM archive. First we must install libchm-bin package containing chm library and its included helper application extract_chmLib. $ sudo apt-get install libchm-bin To convert .chm files in to .html files we use the

Ubuntu --- Setting Up an NFS Server

2010-04-07T16:50:00.005+02:00

The Network File System that is the de facto standard for sharing directories between Unix-like systems over a network. NFS is simple, lightweight, and fast — and its implementation has been freely available for any Unix-like system since the early 1980s. NFSSharing groups of files that multiple people need access to is standard operating procedure in business today and, thanks to home

Ubuntu --- Setting Up a Samba Server

2010-04-07T11:36:00.027+02:00

Samba is probably the best example of the value that open source software can bring to modern computing, enabling seamless data sharing between Unix- like and Microsoft Windows systems thanks to a fantastic combination of reverse engineering and insightful development. CIFS/SMB Like it or not, the planet is populated with Windows machines. As you can see from statements like that, I’m probably

Ubuntu --- Backing Up and Restoring Files

2010-04-06T16:33:00.013+02:00

Ubuntu is knee-deep in excellent software that you can use to do various types of backups, ranging from backing up to files that you can store on removable media or simply move to other systems. Below we discuss BackupPC, an excellent open source backup application for doing regular, networked backups of multiple systems to a central backup server. Backups Backups are spare copies of the files

OpenBSD --- An Overview for newbies

2010-03-23T11:57:00.142+01:00

OpenBSD is a member of the BSD family of operating systems and is widely regarded as the most secure operating system available anywhere, under any licensing terms, for its excellent documentation and its fanatical focus on security debugging, code correctness and freedom. It's widely used by Internet service providers, embedded systems manufacturers, and anyone who needs security and

Ubuntu --- Configuring Servers on Ubuntu

2010-03-20T10:58:00.010+01:00

bb Setting Up a Web Server Most of the significant advances in computing technology have what is known as a killer app (killer application) — one significantly unique, powerful, and compelling type of application that draws people to that technology in droves and makes it a part of the computing landscape for the foreseeable future. For personal computers in general, that application was the

Ubuntu --- Network Configuration and Security

2010-03-19T08:38:00.140+01:00

Real hackers are the electronic equivalent of the National Geographic Society or “Star Trek,” boldly going where no person has gone before. People who break into systems to damage or exploit them are crackers (regard USA mostly in the southern parts of the United States) who give everyone else a bad name. Ubiquitous networking begets the easy availability of tools that enable this sort of thing.

Ubuntu --- Users, Groups, Permissions

2010-03-15T01:46:00.141+01:00

The basics of file and directory protection using users and groups on Ubuntu systems, How users perform tasks that require system privileges on Ubuntu systems using the sudo command. Access Control Lists, a more powerful and modern mechanism for enabling or denying access to specific files and directories. Managing Users, Groups, Authentication, and Advanced PermissionsThough many people

Ubuntu --- All about .deb packages

2010-03-15T01:38:00.011+01:00

Package management is a wonderful thing, enabling your system toidentify installed packages and, with the help of excellentpackage formats such as DEB, identify and satisfy any requirements for successfully installing a completely functional software package. Adding, Removing, Updating SoftwareIf you looked around the universe before settling on Ubuntu Linux, one of the things that you were

Ubuntu --- Startup, shutdown

2010-03-01T13:51:00.260+01:00

The Linux boot process is a very cool combination of hard-wired and flexible steps that make it easy to customize the services that are started on your system and the order in which they are started. Ubuntu Startup and Shutdown Processes Nowadays, booting an Ubuntu Linux system involves watching a friendly splash screen display a variety of system status messages and progress bars as it

Linux Today —Another One overview

2010-02-25T11:13:00.038+01:00

Linux can be used as a desktop system (like Microsoft Windows, OSX), as a Web, file, or print server; or as a programmer’s workstation. You have a lot of flexibility when it comes to how Linux is configured and what software you install and run on it. Because you are free to use open source software as you please—many Linux enthusiasts have come up with interesting and innovative ways to use

Neural Networks

2010-01-26T03:58:00.072+01:00

a IntroA first wave of interest in neural networks (also known as `connectionist models' or `parallel distributed processing') emerged after the introduction of simplified neurons by McCulloch and Pitts in 1943 (McCulloch & Pitts, 1943). These neurons were presented as models of biological neurons and as conceptual components for circuits that could perform computational tasks. When Minsky and

Cloud Computing

2010-01-10T13:33:00.091+01:00

Today, driven in large part by the financial crisis gripping the global economy, more and more organizations are turning toward cloud computing as a low-cost means of delivering quick-time-to-market solutions for mission-critical operations and services. Intro While there is no arguing about the staying power of the cloud model and the benefits it can bring to any organization or government,

The incredible blogosphere world (for newbies)

2009-12-03T00:16:00.053+01:00

...You might prefer IE anyway, but the results you get with it are not necessarily visible to your viewers. This dichotomy reveals the underside of internet site design: What you think you’re showing people might not be what they’re seeing... Digging for traffic Digg is an experiment in collaboratively filtering Web content. Collaborative filtering is a way of finding high quality through

Useful *nix stuff links

2009-12-02T11:14:00.006+01:00

...diving in too fast at the start invites burnout... Process management 4 ways to kill a process-kill, killall, pkill, xkill Networking Ping tutorial: 15 Effective Ping command examples

The Invisible Web

2009-11-25T21:11:00.060+01:00

The world is full of mostly invisible things, And there is no way but putting the mind’s eye, Or its nose, in a book, to find them out. —Howard Nemerov Intro Internet search engines, not readily available to the general public until the mid-1990s, have in a few short years made themselves part of our everyday lives. It’s hard to imagine going about our

Stand-alone (out-of-network) UNIX administration: back to tradition

2009-11-20T03:05:00.113+01:00

Stand-alone UNIX systems administration related issues are: System startup and shutdown User and group accounts management System resources management Filesystems System quotas System security Backup and restoration of the system Automating routine tasks Printing and spooling system Terminals and modem handling Accounting System performance tuning System customization — kernel reconfiguration

Protecting Enterprise Catenets: a big eye view

2009-11-12T02:52:00.045+01:00

two-key cryptographyA 'white hat' is a person who 'uncovers a vulnerability and exploits it with authorization;A 'black hat' is one who 'uncovers a vulnerability and illegally exploits it and/or tells others how to;A 'gray hat' is one who 'uncovers a vulnerability, does not illegally exploit it or tell others how to do it, but works with the vendor; I disagree and prefer SearchSecurity.com's

Linux & Security

2009-11-09T03:59:00.012+01:00

pHardening the operating systemLinux is capable of high-end security; however, the out-of-the-box configurations must be altered to meet the security needs of most businesses with an Internet presence. Here i shows you the steps for securing a Linux system—calledhardening the server—using both manual methods and open source security solutions. The hardening process focuses on the operating system

Nmap Network Scanning

2009-11-05T03:23:00.294+01:00

➪ (Under editing...)Proactive management can help find issues before they turn into serious problems and cause network downtime or compromise of confidential data. Attackers will not wait a week or month to exploit a newly exposed vulnerability, so I can't wait that long to find and patch it either. ...I had to know whenever a router or firewall access control list was misconfigured or a host

Google Hacking for Penetration Testers

2009-11-04T19:51:00.005+01:00

If you think, “Oh, that Google search stuff isn’t very useful in a real-worldpenetration test... that’s just playing around,” then you have no idea what youare talking about.Whenever we conduct a detailed penetration test, we try toschedule at least one or two days for a very thorough investigation to get a feelfor our target before firing a single packet from a scanner. If we can get

A comprehensive (& filosofical) view of security in the past decade(1997)--A not only American story

2009-10-29T19:00:00.112+01:00

The security of the Internet is not a static thing rather is a complex theme. New holes are discovered at the rate of almost one per day.(Unfortunately, such holes often take much longer to fix). A good system administrator know that there is no substitute for experience IntroA text such as this one harbors certain dangers, including: The possibility that readers will use the information

Rootkits

2009-10-22T13:59:00.069+02:00

sLeave No TraceSubtle and insubstantial, the expert leaves no trace; divinely mysterious, he is inaudible. Thus he is the master of his enemy's fate.SUN TZURootkits are not, in and of themselves, malicious. However, rootkits can be used by malicious programs. Understanding rootkit technology is critical if you are to defend against modern attacks.

Pc cabinets (chassis, cases, telai) & Power supplies(alimentatori)

2009-04-19T13:36:00.013+02:00

Chassis di qualitàA differenza del resto dei componenti che costituiscono un PC il telaio è la parte fondamentale che potrebbe durare finché dura il formato della motherboard ATX nelle varie salse (ossia una vita). Questo fatto ci suggerisce che dobbiamo sceglierlo con cognizione di causa.I componenti hardware da installare forniscono prestazioni elevate e richiedonospazio e raffreddamento

Linux distros for a newbie

2009-04-18T09:33:00.097+02:00

... just few words about ...What's a Distribution? An operating system(OS) consists of a lot of files that perform a lot of different functions. The task of getting Linux onto your computer in working order, along with the applications that you are likely to want, has fallen to a varied group of entities—companies, universities, user groups, and even private individuals. These entities create

3D graphic cards

2009-04-13T13:28:00.024+02:00

-Da PC

internetworking Windows-Linux in una rete SMB/CIFS ... ed altro

2009-04-09T16:52:00.269+02:00

➪ (Under refinement...)Introduzione Malgrado gli innumerevoli post e le varie guide sembra che Samba sia ancora un argomento interessante pieno di domande da parte di noi utenti (e qualche volta amministratori) a causa forse della sua natura interdisciplinare e per questo complessa. Si va dal networking al internetworking al securing ed altro in cui ogni settore se andiamo ad approfondirlo è..