Sunday, May 19, 2013

Configure Your Linux Server as Postfix Mailing gateway in step by Step

Set Up Postfix as Email server Step by step:
1 For this tutorial I have used following software:
I OS- Linux Cent OS 5.4
II. Fetch mail 6.3  to retrieve email from remote server
III Postfix 2.3.3  as MDA
IV Dovecot /IMAP
V Squirrelmail as webmail
VI MS Outlook as email clinet program

Step-I .Install Redhat Enterprise Linux or Centos then install above listed package as explained below
[root@satishmalanch ~]# yum install postfix

[root@satishmalanch ~]# yum install  fetchmail
[root@satishmalanch ~]# yum install dovecot

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Friday, January 25, 2013

Creating Static Route in Red Hat Enterprise Linux

Static routes improves overall performance of your network.They are also useful in stub networks (i.e. there is only one link to the network). For example, each LAN (located at different offices) is connected VPN or lease line.
They are very helpfull in bandwidth saving also
So here we go :
Login in root :
to view routs:  ip route show

Adding route in linux server route add -net netmask gw 192.168.01 dev eth1 /etc/init.d network restart

Connect with me on :


Saturday, July 7, 2012

How to Set up NAT Server

This article will explain in few simple steps that how we will set up our widows/Linux system as a NAT server
Typical Scenerio of NAT (Network Address Translation ) is given Below:

Tuesday, February 7, 2012

Excel file are not opening with double click

Problem: Excel  file not opening with double click ,stil able to open with file-open menu.
In such kind of problem when you click (double  of course) on an excel file,however you may open file in File menu by clicking on file-open

One of these three solution may be resolve your issue:
1.Cliick on any folder and go to tool-folder options-file type;       

Friday, December 23, 2011

What is 3G Technology

What is 3G ?

3G (High-Speed Downlink Packet Access or HSDPA) ?
 3G stand for the third generation of mobile communication.3G enable us  to simultaneously transfer both voice data (a telephone call) and non-voice data (such as downloading information, exchanging e-mail, and instant messaging. The highlight of 3G is video telephony.

I have noticed one thing that most of people always says that 3G is technology for video call only  and for a handset being 3G there must be a front camera. This is not purely true.Video call can be made over 2G network also but 3G provide streaming very clear due to high speed and it is not necessary to have front camera on 3G handset. 3G technology provide you high data transfer speed upto 57Mbps and hence you can enjoy video call, live TV online games etc which require high bandwidth.
With the help of 3G, we can access many new services too. One such service is the GLOBAL ROAMING. Another thing to be noted in case of 3G is that Wide Band Voice Channel that is by this the world has been contracted to a little village because a person can contact with other person located in any part of the world and can even send messages too. Then the point to be noted is that 3G gives clarity of voice as well can talk with out any disturbance. Not only these but also have entertainments such as Fast Communication, Internet, Mobile T.V, Video Conferencing, Video Calls, Multi Media Messaging Service (MMS), 3D gaming, Multi-Gaming etc are also available with 3G phones.
3G was firsly launched in 2001 in Japan by NTT DOCOMO, a Japanese telecom company. Japan was the first country to introduce 3G on a large commercial scale. In 2005, about 40 per cent of subscribers used only 3G networks. There are about 60 3G networks across 25 countries
India launched 3G service on 11 Dec 2008 in Delhi and later in Mumbai. MTNL (Govt of India undertaking ) become first company to launch it .Later on another Govt under taking state company BSNL start 3G service on Feb 22,2009 in Chennai and lateron in whole country.3G spectrum allocated to all private operator on September 2010, there after 3G launched by all major private telecome company.TATA lauched with joint venture of Japanese company DOCOMO first private sectors 3G network in Novemeber 2010. All the operators provide 3G services on the 2100 MHz band. As of now, the Government owned BSNL is the most successful company with the maximum subscribers of 3G service. It has more than 3 million subscribers of its 3G service

Thursday, December 22, 2011

Mobile Operating Systems

Cell phone use many kind of operating system .Operating system is software that provide interface between user and cell phone. Some cell phone use their own proprietor OS, where as other use some standard OS. Most of phone use java based OS. Nokia Use Symbian OS in its smart phones, Samsung use Bada  and others OS, Blackberry use Blackberry OS .Most of these OS are java based.
Nows days enterprise level OS are gaining popularity in business and entertainment based application. Google launch its own OS named as Android as universal mobile OS. It has been adopted by many cell manufacture like Samsung,Motorola ,Sony erriscon and many others.While Apple is also giving a tight completion with its iphone, blackberry is also a leading in business applications with blackberry OS.

You all have heard about Android Phone and even most of you are using also. Android is a derived from an open source operating system Linux. Open source software are those software whose code are made available for user for modification .Anyone is free make changes in source code of such programs. Initially Android  was design by a small company later on Google Inc purchase this company and keep developing android. It was released in Nov 2007.
Logo Android
Today most of Smart Phones ,PDA and Tablets are using android OS. According to software developers , In future plenty of device like washing machines, vehicle, traffic management system, Digital Control Panel for many devices  etc will run with android. Android was limited only up to mobile phones before version 2.0 (1.0,1.5,1.6). But after 2.0 version many tablets adopted Android.
Most Android phones, and some Android tablets, now use a 2.x release. Android 3.0 was a tablet-oriented release and does not officially run on mobile phones. The current Android version is 4.0
On 15 November 2011, Android reached 52.5% of the global Smartphone market share.(Source-Wiki-pedia)
Some of leading companies which launch Android driven  smart phones and Tablets are :Samsung, HTC, ACER ,LG,MOTOROLA, Sony Ericsson etc

Android Market is the online software store developed by Google for Android devices. An application program ("app") called "Market" is preinstalled on most Android devices and allows users to browse and download apps published by third-party developers, hosted on Android Market. As of October 2011 there were more than 300,000 apps available for Android, and the estimated number of applications downloaded from the Android Market as of December 2011 exceeded 10 billion.The operating system itself is installed on 130 million total devices.
Link to Android market is :