Category Archives: Technology

Fedora vs Redhat vs CentOS

What’s the difference between Fedora, Redhat and CentOS?

Fedora, Redhat and CentOS all three belongs to Linux family and for non-linux users they seems almost same. Though this is incorrect. Let me shade the light on the thin line between these sapiens.

Fedora is the main project, and it’s a community-based, free distro focused on quick releases of new features and functionality.

Redhat is the corporate version based on the progress of that project, and it has slower releases, comes with support, and isn’t free.

CentOS is basically the community version of Redhat. So it’s pretty much identical, but it is free and support comes from the community as opposed to Redhat itself.

fedora vs redhat vs centos

fedora

– Run by Redhat organisation
– Community driven
– Focused on quick release
– stresses on features and functionalities
– Free

redhat

– Based on Fedora
– Run by Redhat organisation
– Released corporately by Redhat
– Focused on long releases for stability
– Stresses stability over features
– Commercial (non-free)
– Red Hat Enterprise Linux is a subscription product that is developed, maintained, and supported by Red Hat for its subscribers.

CentOS

– Based off of commercial releases of Redhat (distro)
– Run by the community
– Basically Redhat without the cost or support
– CentOS is a community project that is developed, maintained, and supported by and for its users and contributors.

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How to use Telnet

TL;DR; Telnet is a network protocol that allows a user on one computer to log into another computer that is part of the same network.

Telnet is a text based application, often used at the command line of an operating system. Most importantly it uses the Telnet protocol (which is part of the TCP/IP protocol suite) to connect to a remote computer over a network. Keep in mind, telnet is an external command, which is available in certain microsoft operating systems as telent.exe. Running the telnet application requires different set of commands on different operating systems.

telnet
how telnet works

Example:

prompt$ telnet kumar.swatantra.info 23

Usage:

# telnet [host [port]]
telnet servername-or-ip [port-number]

Ports are specific gateways for Internet traffic to travel over. It’s similar to a large hallway with many doors leading outside. If a door is locked, you cannot access the outside world.

Telnet syntax

telnet [host [port]]

host Specifies the hostname or IP address of the remote computer.
port Specifies the port number or service name.

Commands available through the actual telnet program:

close Close current connection.
display Display operating parameters.
open Connect to a site.
quit Exit telnet.
set Set options (Type ‘set ?’ for a list).

NTLM Turn ON NTLM Authentication.
LOCAL_ECHO Turn ON LOCAL_ECHO.
TERM x (where x is ANSI, VT100, VT52, or VTNT)
CRLF Send both CR and LF
status Print status information.
unset Unset options (Type ‘unset ?’ for a list).

NTLM Turn OFF NTLM Authentication.
LOCAL_ECHO Turn OFF LOCAL_ECHO.
CRLF Send only CR (no LF is sent)
?/help Print help information.

Linux

  1. Open the your terminal application
  2. At the shell prompt, type: telnet exampleserver.com 23
  3. On a normal Unix machine the port is just the second argument on the command line.

Windows

  1. Click the start button
  2. Choose “run” from the start menu
  3. Type “cmd.exe” in to the run box
  4. At the cmd prompt, type: telnet exampleserver.com 23

Mac OS X

  1. Open the Applications menu or folder
  2. Select the Utilities folder
  3. Start the Terminal.app application
  4. At the shell prompt, type: telnet exampleserver.com 23
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