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attempt to access beyond end of device: Linux Error

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Recovering ext2, ext3 and reiserFS filesystems...
The error is generally encountered while attempting to access a Linux partition, trying to mount it or while starting the system. The error specifications also include rw, limit and want parameters that define some sector numbers.

The reason why the error message occurs is that system tries to access such sectors that are not there on disk.
read more...
permapage | score:9980 | -stellarinfo, May 5, 2009

IT Certification Practice Tests

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PracticeTests.info has recently been updated thoroughly to provide information on available IT Certification practice tests vendors. This website contains useful information about various IT certification exams that help candidates aspiring for an IT certification from any of the domains like Cisco, CompTIA, Microsoft, EC-Council, PMI etc. Information about certification practice tests offered by leading vendors like Transcender, Boson, Measure Up, Simulation Exams etc and links to the respective vendor pages is provided. The candidates can analyse, compare, and decide the more relevant vendor to purchase Practice Tests and achieve the Certification.

The certification information is provided for the following:
  • Microsoft: MCSE 2000, MCSE 2003, MCSD, etc.
  • CompTIA: A+, Network+, Security+, etc.
  • Cisco: CCNA, CCNP, CCDP, CCIE, etc.
  • CheckPoint: CCSPA, CCSA NGX, CCSE NGX, etc.
  • Java: SCJA, SCJP, SCJD, etc.
  • Oracle: OCA 10g, OCA 11g, OCP 10g, OCP 11g, etc.
The website is updated regularly, and more information is added from time to time. The website uses CSS 2.0 (Cascading Style Sheets) and checked for compliance with major browsers like Internet Explorer, and FireFox. read more...
permapage | score:9967 | -Vijay, May 2, 2009

Free Websites: Spruz.com

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How would you like a free website that is easy to use but powerful at the same time? If you answered yes then you should head over to www.spruz.com.

Spruz has a powerful site hosting system with a large array of features.  For a hosted solution users have a lot of flexibility with customizing the site. Users are able to select a theme from their theme library and fully customize every aspect of the layout. Advanced users can edit an style sheet and completely change the layout.

Top Features include;
  • No Bandwidth Limit
  • Completely Free (Not a trial, Few Advertisements)
  • Dynamic Content (Tons of elements that can be added
    and placed anywhere on the pages)
  • File Space up to 500MB
  • Sub Domains (Users can use their own domain name)
  • Many Components (Forums, News, Blogs, Galleries, Downloads and More)
  • Full Member Profiles
Plus the support is great! The developers answer questions in forums and emails the same day!
read more...
permapage | score:9937 | -jay, March 20, 2007 (Updated: March 26, 2007)

Web hosting reviews and information

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HostingLair is a great site. Nowadays, when thousands of web hosting providers offer all kinds of "to good to be true" hosting plans and when almost every site recommends specific hosting company not because of it's competence and quality but because the hosting company pays the most, HostingLair is a valuable source dedicated to helping customers understand web hosting issues and detect reliable and trustworthy hosting providers. This site explains basic web hosting concepts and displays tried and true hosting providers. Hosting providers are not recommended in accordance with the money they pay but were selected on the basis of experience numerous customers have had with a specific company. The proof of this is that anyone can clearly see that if the money was the key, there were certainly "better" companies to recommend. This site saves you a lot of time and helps you find reputable web hosting provider as soon as possible. read more...
permapage | score:9908 | -Marc Anders, June 30, 2007

IP Addressing - An Introduction

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IP Addressing

An IP address is a unique logical identifier for a node or host connection on an IP network. IP address is a 32 bit binary number, and represented by 4 decimal values of 8 bits each. The decimal values range from 0 to 255. This is known as "dotted decimal" notation.

Example: 192.189.210.078

It is sometimes useful to view the values in their binary form.

Dotted decimal: 192 .189 .210 .078
Binary: 11000000.10111101.11010010.1001110

Every IP address consists of network identifier and node identifier. The IP network is divided based on Class of network. The class of network is determined by the leading bits of the IP address as shown below.

IP Address Classes

There are 5 different address classes. You can determine which class any IP address is in by examining the first 4 bits of the IP address.

  • Class A addresses begin with 0xxx, or 1 to 126 decimal.

  • Class B addresses begin with 10xx, or 128 to 191 decimal.

  • Class C addresses begin with 110x, or 192 to 223 decimal.

  • Class D addresses begin with 1110, or 224 to 239 decimal.

  • Class E addresses begin with 1111, or 240 to 254 decimal.
Addresses beginning with 01111111, or 127 decimal, are reserved for loopback and for internal testing on a local machine. Class D addresses are reserved for multicasting. Class E addresses are reserved for future use. They should not be used for host addresses.

Now we can see how the Class determines, by default, which part of the IP address belongs to the network (N) and which part belongs to the Host/node (H).
  • Class A: NNNNNNNN.HHHHHHHH.HHHHHHHH.HHHHHHHH


  • Class B: NNNNNNNN.NNNNNNNN.HHHHHHHH.HHHHHHHH


  • Class C: NNNNNNNN.NNNNNNNN.NNNNNNNN.HHHHHHHH

In the example, 192.189.210.078 is a Class C address so by default the Network part of the address (also known as the Network Address) is defined by the first three octets (192.189.210.XXX) and the node part is defined by the last one octets (XXX.XXX.XXX.078).

In order to specify the network address for a given IP address, the node section is set to all "0"s. In our example, 192.189.210.0 specifies the network address for 192.189.210.078. When the node section is set to all "1"s, it specifies a broadcast that is sent to all hosts on the network. 192.189.210.255 specifies the broadcast address.

Private Subnets

There are three IP network addresses reserved for private networks. The addresses are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. They can be used by anyone setting up internal IP networks, such as an intranet. Internet routers never forward the private addresses over the public Internet.

See more networking tutorials at http://www.simulationexams.com/tutorials/ccna/ccna-tutorials.htm read more...
permapage | score:9907 | -Vijay, January 20, 2007

Easy SEO Tips (Search Engine Optimization)

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  • Keywords are the weapon of your success in SEO; use those keywords that are directly related or targeted to your business theme.

  • Take care not to crowd your site content with keywords. Also, spread them throughout the content rather than mostly at the beginning or at the end.

  • Back-links are important so build links with potential partners that can generate traffic to your site.

  • Choose good titles and Meta tags. Good titles include suitable, targeted, theme based, precise keywords. Phrases in Meta tags help spiders undersdand and your pages easily.

  • Build pages that are easy to load. Don’t make pages with large images, but if images are necessary, do this: Make a thumbnail and link it with full image page to add more pages and text which spiders love.
  • . . .
read more...
permapage | score:9894 | -midassoft, March 16, 2007

Frihost: free web hosting

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Frihost stands for Free Reliable Internet Hosting. It offers free web hosting for all active members of its community forums with features like:
  • 250MB of space and 10GB of traffic.
  • One free subdomain and unlimited other domains.
  • Php, mysql, ssi, perl and cgi.
  • Unlimited email and ftp accounts.
  • No forced advertisements.
The support is also something to be mentioned. It isn't the professional support of a paid host, but the support from a community of thousands of people who encountered the same problems.

If you hate posting in a forum and don't see it as a place to learn, relax or chat, then Frihost is not what you are searching for. Otherwise, enjoy your stay! read more...
permapage | score:9890 | -Bondings, December 27, 2005

Test your Linux Distro Firewall

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The Firewall Tester (FTester) is a tool designed for testing firewalls filtering policies and Intrusion Detection System (IDS) capabilities.

So... a good idea is to run FTester each time you make changes to your firewall,or from time to time just to make sure that your firewall works! read more...
permapage | score:9886 | -Anonymous, June 11, 2006

Tech-IT: Tech Reviews

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This is my new tech site. I created it so I could give my reviews on things like computers and operating systems and tools. There are also forums so people may discuss what I have posted and/or whatever they want to discuss.

I hope that my site is of interest and value. read more...
permapage | score:9884 | -Calvin B, June 10, 2008

The Math of Subnetting Networks

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If you don't know what network subnetting is, don't start here...
This document will cover two quick ways for figuring out the numbers behind subnetting. The first way involves making a simple chart, the second way uses simple math that most people can do in their head, at least for smaller numbers. The first way is recommended for any exams, or times when you need to do a lot of subnetting quickly. The second way works best if you just need to know one or two examples, or to check your work from the chart.
read more...
permapage | score:9881 | -Ray, January 6, 2006

Damn Vulnerable Linux

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Damn Vulnerable Linux is a distribution, based on Damn Small Linux, with a large number of vulnerabilities built right in.
Securing Linux by breaking it with Damn Vulnerable Linux:
Damn Vulnerable Linux (DVL) is everything a good Linux distribution isn't. Its developers have spent hours stuffing it with broken, ill-configured, outdated, and exploitable software that makes...
read more...
permapage | score:9875 | -Ray, March 12, 2007

Online Alphabetical List of Linux Commands

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You'll probably want to bookmark this handy directory.
This directory of Linux commands is from Linux in a Nutshell, 5th Edition.

Click on any of the 687 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Bookshelf.
read more...
permapage | score:9871 | -Ray, February 18, 2006

Understanding the Linux /proc filesystem

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Here's a nice guide to the /proc filesystem and its secrets...
When it comes down to it, /proc is a filesystem. Although it does not represent any physical device, you can still mount it and unmount it as you please. It contains a multitude of valuable information regarding the processes you are running, as well as the hardware you have hooked up to your computer (although in recent years, /sys has been devised by the Kernel folks to represent the hardware hierarchy and export device information ). You can see which modules you have loaded, how long your system has been up, and the memory usage of processes on your system. In fact, every single process running has an entry, or directory, inside /proc. As you can see, /proc can be a very powerful asset. But before you can use it, you need to mount it.
read more...
permapage | score:9867 | -Ray, March 16, 2006 (Updated: March 23, 2007)

Operating Systems Interactive Comparison Chart

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The Operating System Comparison Chart lets you select from one to thirteen OSes, with more on the way. Currently available OSes are:
  • Linux 2.0
  • Linux 2.2
  • HPUX
  • NT
  • BSDI
  • FreeBSD
  • IRIX
  • Be OS
  • Tru64 Unix (formerly Digital Unix)
  • Solaris
  • MacOS
  • OS/2
  • UnixWare
  • OpenServer
After selecting which OSes to compare, you choose the categories of information you want in the chart. Categories are:
  • OS and Net interoperability
  • Hardware
  • OS Convenience
  • OS
  • User Base
  • Provider
  • More Info
Then, click the button and you have a nice table of comparison info. Enjoy! read more...
permapage | score:9862 | -Anonymous, May 14, 2000

Search Engine for Unix Sysadmins

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coolcommands.com is a search engine for UNIX system administrators. Our database provides access to useful commands for all flavours of UNIX including: Sun Solaris, IBM , HP/UX, Linux, SCO UNIX, OpenBSD, SGI Irix, Compaq Tru64 and FreeBSD.

We not only provide a searchable database of commands and one-line scripts, we also allow you to search by category making it easier to find that command you are looking for. Each coolcommand provides a summary, description and example to make your life as a sysadmin easier. read more...
permapage | score:9861 | -lvo, December 24, 2005

Web Hosting Guide

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Webhostingclue provides the very comprehensive web hosting resource, including: Web Hosting Guide, Top Web Hosting Plan, Web Site Design and Web Site Promotion, etc. You will find free and unbiased web hosting knowledge there.

Besides giving you the web hosting guide, Webhostingclue also try its best to make it a safety place to find a web hosting solution for the web site. All the web hosting solution provider here have been web hosting industry for more than 2 years with top performance in their target market such as Small business, home business, individual, developer, and enterprise, etc. And all the plan will provide Money back Guarrantee so that you can enjoy their service instead of put your money in risk. read more...
permapage | score:9856 | -rayzheng, January 9, 2007
More sysadmin articles...
 

Articles and website reviews are owned by their authors.
The rest is © 2000-2009, Ray Yeargin.

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