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Modern art T shirts for the sysadmin, tech, or geek |
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I've finally gotten around to putting up a tee shirt shop for sysadmins and command line nerds. There are several designs incorporating the word, 'Daemon', some bearing the term, 'Sysadmin', and others with the (non)word, 'Textmode'. Or, if you are a 'Dataserf', there's now a shirt for you. There's even San Francisco and New York shirts available.
Update: T-shirts with names rendered as digital art are now available as well...
These curiously beautiful images were generated by ancient C algorithms rediscovered in computer archives from the last millenium. read more... |
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| | permapage | score:9893 | -Ray, May 13, 2010 (Updated: May 26, 2010) |
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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... |
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| | permapage | score:9871 | -stellarinfo, May 5, 2009 |
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Free SSH, HTTP, BNC, PSYBNC, CGI, PHP Hosting |
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I would like like to introduce you to a Shell service that has been in operation for over a year now. We are called Shellium.org. We offer a free world class service, with near 24/7 IRC Support, an active, and widely diversified group of Admins and Operators. In addition, we offer 100MB's of free hosting/storage space, in addition to access to Cron, GCC and other nifty tools. We also offer NO-ADD website hosting. In addition, we have a widely supported wiki that we maintain for our newer users, it aids in helping people create eggdrop bots, BNC/PSYBNC's and other fun tools. We provide access to NMAP for vulnerability testing.
At one point, we had about 700 users that we maintained. We are a dominating free shell provider with world class people, and we welcome you to our home.
However, what we at shellium do not support is malicious activity, and we watch our shell very thoroughly.
If you would like to know more information please visit Shellium.org, or connect to irc.freenode.net Channel (#Shellium) or you can email at xps9000 (at) shellium.org. read more... |
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| | permapage | score:9864 | -xps9000, September 15, 2009 (Updated: March 22, 2010) |
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SemSim Router Simulator For CCNA / Cisco networks |
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| Router simulator for CCNA students & engineers. Includes FREE CCNA exam like troubleshooting lab. Supports over 200 commands, over 30 interactive labs, 6 CCNA exam like practical troubleshooting scenarios, 70 randomized flash cards,3 router tests. Other Features: Test mode/ learn mode, detailed score report pinpoints your weak areas. Great practice supplement to any book on IOS/CCNA.Provides hands on practice with commands/concepts. Based on new exam format. read more... |
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| | permapage | score:9830 | -roh123, August 15, 2003 (Updated: November 22, 2005) |
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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... |
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| | permapage | score:9798 | -Vijay, May 2, 2009 |
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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... |
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| | permapage | score:9798 | -Calvin B, June 10, 2008 |
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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... |
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| | permapage | score:9793 | -jay, March 20, 2007 (Updated: March 26, 2007) |
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Get a Free Unix Shell Account |
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"To get an account at Hobbiton, click "New Account" ... or telnet in and log in as newuser.
As a user of Hobbiton, you may log in with telnet to our free unix shell. Please review the acceptable use policy before using the shell.
For Windows users: Use a good telnet client such as Tera Term Pro. (Windows telnet is _not_ a "good" one!) Overwrite the old settings file with ours for best results. An SSH plugin is available also. Put it in your Tera Term directory and run ttssh instead. You should use it to prevent people from intercepting your passwords and data."
[The original site described here no longer provides free shell accounts. However, here are the sources you need:] read more... |
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| | permapage | score:9793 | -Ray, February 3, 2001 (Updated: April 24, 2010) |
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Techgurulive - Howtos and Tutorials |
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Techgurulive is all about howto's and tutorials on Apache, Linux, Windows, Mysql etc
It is a overwhelming website. It has what seems like hundred's of articles,free advice related to the IT field and help on almost any topic of interest to any IT professionals.Although it is a free site it is laden with advertising.
The real gem of Tech Guru is that it does not advertise on contents, very clean interface, very good search module , The user can also avail articles on mail, Rss feed is also enabled.
Here you can also ask questions and get advice from IT professionals. read more... |
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| | permapage | score:9787 | -jacob, October 6, 2008 |
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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... |
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| | permapage | score:9774 | -Ray, March 12, 2007 |
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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... |
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| | permapage | score:9773 | -Anonymous, May 14, 2000 |
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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... |
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| | permapage | score:9766 | -Ray, March 16, 2006 (Updated: March 23, 2007) |
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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... |
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| | permapage | score:9747 | -Vijay, January 20, 2007 |
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Learn to subnet (networking) |
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"A Free Lecture-based Educational Course on IP Addressing and Subnetting"
"This presentation was created to teach computer professionals how to address IP networks and perform subnetting. Subnetting is one of the most difficult activities network technicians are required to perform. Many people have found viewing these presentations multiple times increases understanding."
[Several of the background information sections of this site require IE 4 or 5 to work properly.] read more... |
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| | permapage | score:9741 | -Ray, December 1, 2000 |
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The Short Life and Hard Times of a Linux Virus |
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| Why aren't the existing Linux viruses anything more than a topic for columns such as this one? Why don't they affect you in your daily computing in the way that MS viruses affect Windows users? read more... |
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| | permapage | score:9737 | -Ray Yeargin, March 26, 2000 (Updated: November 23, 2002) |
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Free DNS, Dynamic DNS |
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Do you want to make your desktop box a server that you (and your friends) can access by name? This may be for you...
- Host your own site on your own connection from home/work/school/etc
- Access your computer with a name (like zeus.afraid.org or yourdomain.com) instead of a numeric IP address
- Run your own http server, ftp server, or anything you want to install on your computer/server
- Fetchable URL to update your IP instantly on our network if you have a dynamic address
- Hosts even work for your LAN. If you have a LAN connected to the internet you can point hosts to private IP addresses (even private IPv6 addresses) and they will work within your network
- Let your friends point theirname.yourdomain.com to their own connection
- etc...
read more... |
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| | permapage | score:9735 | -Ray, January 4, 2006 |
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