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Thursday, July 25

8:12 pm

TATA DOCOMO launched special tariff vouchers for 2g data usage

India’s leading mobile operator Tata Docomo, telecom arm of iconic Tata Group has launched two new special tariff vouchers which offer 2G data as well as specially designated data for usage on Saavn.

 This is the unique attempt by any Indian mobile operator, that they are offering data for Saavn. It can be noted that only Reliance Communications has similar packs for Facebook and Whatsapp also offer free Twitter access.

 Pack value: Rs 104
Data: 1GB 2G
Saavn usage: 500 MB
Validity: 30 days

 Pack value: Rs 155
Data: 1GB 2G
Saavn usage: 1GB
Talktime: 100 min
Validity: 30 days

 As I used Saavn over 2G, found that audio streaming over 2G is not that bad, rather it was quite fast even on 2G. For more details call 121 from your Tata Docomo mobile.
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Tuesday, July 16

5:57 pm

BSNL Reduces Free Data in 2G Mobile Internet – GPRS Packs

India’s national telecom backbone Bharat Sanchar Nigam Limited (BSNL) has revise its Mobile Internet -2G Data/GPRS Packs across all its circles.In BSNL there are about four 2G Data packs for prepaid users on offer for every one’s need – light, medium and heavy usage, has been revised. BSNL reduced the 2G Data under the Rs.54, Rs.125, Rs.270 and Rs.300 GPRS Packs.

 Starting from 17th April, 2013, in GPRS Pack 54 it has slashed validity from 30 days to 25 days while keeping data benefits unchanged. 2G Data Pack Rs.125 will now offer 1.5 GB instead of 2000 MB.

 Similarly GPRS Pack of Rs.270 will provide reduced data as the new data usage will be 5 GB while earlier it offered 10 GB data. GPRS Pack of Rs.300 has now bring 6 GB, reduced from existing 8 GB data usage.
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5:52 pm

How Virtual Private Networks Work. (part.2)

VPN Security: Firewalls
A well-designed VPN uses several methods for keeping your connection and data secure:
  • Firewalls
  • Encryption
  • IPSec
  • AAA Server
In the following sections, we'll discuss each of these security methods. We'll start with the firewall.

A firewall provides a strong barrier between your private network and the Internet. You can set firewalls to restrict the number of open ports, what type of packets are passed through and which protocols are allowed through. Some VPN products, such as Cisco's 1700 routers, can be upgraded to include firewall capabilities by running the appropriate Cisco IOS on them. You should already have a good firewall in place before you implement a VPN, but a firewall can also be used to terminate the VPN sessions
VPN Security: Encryption

Encryption is the process of taking all the data that one computer is sending to another and encoding it into a form that only the other computer will be able to decode. Most computer encryption systems belong in one of two categories:
  • Symmetric-k*y encryption
  • Public-k*y encryption
In symmetric-k*y encryption, each computer has a secret k*y (code) that it can use to encrypt a packet of information before it is sent over the network to another computer. Symmetric-k*y requires that you know which computers will be talking to each other so you can install the k*y on each one. Symmetric-k*y encryption is essentially the same as a secret code that each of the two computers must know in order to decode the information. The code provides the k*y to decoding the message. Think of it like this: You create a coded message to send to a friend in which each letter is substituted with the letter that is two down from it in the alphabet. So A becomes C,and B becomes D.You have already told a trusted friend that the code is Shift by 2.Your friend gets the message and decodes it. Anyone else who sees the message will see only nonsense.

The sending computer encrypts the document with a symmetric k*y, then encrypts the symmetric k*y with the public k*y of the receiving computer. The receiving computer uses its private k*y to decode the symmetric k*y. It then uses the symmetric k*y to decode the document.

Public-k*y encryption uses a combination of a private k*y and a public k*y. The private k*y is known only to your computer, while the public k*y is given by your computer to any computer that wants to communicate securely with it. To decode an encrypted message, a computer must use the public k*y, provided by the originating computer, and its own private k*y. A very popular public-k*y encryption utility is called Pretty Good Privacy (PGP), which allows you to encrypt almost anything. You can find out more about PGP at the PGP site.

VPN Security: IPSec

Internet Protocol Security Protocol (IPSec) provides enhanced security features such as better encryption algorithms and more comprehensive authentication.

IPSec has two encryption modes: tunnel and transport. Tunnel encrypts the header and the payload of each packet while transport only encrypts the payload. Only systems that are IPSec compliant can take advantage of this protocol. Also, all devices must use a common k*y and the firewalls of each network must have very similar security policies set up. IPSec can encrypt data between various devices, such as:
  • Router to router
  • Firewall to router
  • PC to router
  • PC to server
VPN Security: AAA Servers

AAA (authentication, authorization and accounting) servers are used for more secure access in a remote-access VPN environment. When a request to establish a session comes in from a dial-up client, the request is proxied to the AAA server. AAA then checks the following:
  • Who you are (authentication)
  • What you are allowed to do (authorization)
  • What you actually do (accounting)
The accounting information is especially useful for tracking client use for security auditing, billing or reporting purposes.

VPN Technologies

Depending on the type of VPN (remote-access or site-to-site), you will need to put in place certain components to build your VPN. These might include:
  • Desktop software client for each remote user
  • Dedicated hardware such as a VPN concentrator or secure PIX firewall
  • Dedicated VPN server for dial-up services
  • NAS (network access server) used by service provider for remote-user VPN access
  • VPN network and policy-management center

Because there is no widely accepted standard for implementing a VPN, many companies have developed turn-k*y solutions on their own.
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5:39 pm

How Virtual Private Networks Work. (part.1)

The world has changed a lot in the last couple of decades. Instead of simply dealing with local or regional concerns, many businesses now have to think about global markets and logistics. Many companies have facilities spread out across the country or around the world, and there is one thing that all of them need A way to maintain fast, secure and reliable communications wherever their offices are.

Until fairly recently, this has meant the use of leased lines to maintain a wide area network (WAN). Leased lines, ranging from ISDN (integrated services digital network, 128 Kbps) to OC3 (Optical Carrier-3, 155 Mbps) fiber, provided a company with a way to expand its private network beyond its immediate geographic area. A WAN had obvious advantages over a public network like the Internet when it came to reliability, performance and security. But maintaining a WAN, particularly when using leased lines, can become quite expensive and often rises in cost as the distance between the offices increases.

As the popularity of the Internet grew, businesses turned to it as a means of extending their own networks. First came intranets, which are password-protected sites designed for use only by company employees. Now, many companies are creating their own VPN (virtual private network) to accommodate the needs of remote employees and distant offices.

Basically, a VPN is a private network that uses a public network (usually the Internet) to connect remote sites or users together. Instead of using a dedicated, real-world connection such as leased line, a VPN uses virtual connections routed through the Internet from the company's private network to the remote site or employee. In this article, you will gain a fundamental understanding of VPNs, and learn about basic VPN components, technologies, tunneling and security

What Makes a VPN ?

A well-designed VPN can greatly benefit a company. For example, it can:
  • Extend geographic connectivity
  • Improve security
  • Reduce operational costs versus traditional WAN
  • Reduce transit time and transportation costs for remote users
  • Improve productivity
  • Simplify network topology
  • Provide global networking opportunities
  • Provide telecommuter support
  • Provide broadband networking compatibility
  • Provide faster ROI (return on investment) than traditional WAN
What features are needed in a well-designed VPN? It should incorporate:
  • Security
  • Reliability
  • Scalability
  • Network management
  • Policy management
There are three types of VPN. In the next couple of sections, we'll describe them in detail.

Remote-Access VPN

There are two common types of VPN. Remote-access, also called a virtual private dial-up network (VPDN), is a user-to-LAN connection used by a company that has employees who need to connect to the private network from various remote locations. Typically, a corporation that wishes to set up a large remote-access VPN will outsource to an enterprise service provider (ESP). The ESP sets up a network access server (NAS) and provides the remote users with desktop client software for their computers. The telecommuters can then dial a toll-free number to reach the NAS and use their VPN client software to access the corporate network.

A good example of a company that needs a remote-access VPN would be a large firm with hundreds of sales people in the field. Remote-access VPNs permit secure, encrypted connections between a company's private network and remote users through a third-party service provider.

Site-to-Site VPN

Through the use of dedicated equipment and large-scale encryption, a company can connect multiple fixed sites over a public network such as the Internet. Site-to-site VPNs can be one of two types:

Intranet-based - If a company has one or more remote locations that they wish to join in a single private network, they can create an intranet VPN to connect LAN to LAN.

Extranet-based - When a company has a close relationship with another company (for example, a partner, supplier or customer), they can build an extranet VPN that connects LAN to LAN, and that allows all of the various companies to work in a shared environment.
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5:28 pm

ABOUT US


GARRY
FOUNDER & AUTHOR
GARRY is a young Entrepreneur running a famous blog from his living room. He is a SEO Consultant, Professional Blogger & an addicted Web Developer. For any query plz mail to me at 
zx15gp@gmail.com





In first half of the year 2012 GARRY launched his blog on callertunes and mobile networks which is now serving quality articles daily.CALLERTUNES4U BLOG offers many inforamative and helpful posts for all people around the globe who want latest information on mobile networks and now has a loyal readership of over 200+ regular readers.


GARRY started blogging in 2012 while was in college study.He started writing blogs just to do something more creative and since then have not looked back.His thirst for learning and understanding latest web technologies like HTML4, CSS3, PHP and JavaScript equipped him with an excellent art of web designing.He is now a web designer and blogger, by all rights without having taken any professional training.


The purpose of publishing CALLERTUNES4U BLOG was to provide high quality posts about latest information about mobile networks and caller tunes.Each post is published with a hope so that every person stay updated with new information about moblie networks and act as a rich resource to the online community and make a happy living online.

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