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Thursday, July 17, 2008

Cell Phone Reverse Number Lookup Companies

One of the most frustrating things is missing a call, and then not recognizing the number afterwards. Or having the phone number of an old friend, but then not having the details of their new address should they move. Thankfully, with cell phone reverse number lookup, this is a problem that you can overcome much easier.

What Is Cell Phone Reverse Number Lookup?

Much like its residential sibling, cell phone reverse number lookup allows you to basically look up the name and address details of pretty much any cellular number that you may have. So, if you've lost the address details of an old friend, or are looking to find out whom the unrecognized call was from, help is at hand with a cellular reverse lookup.

However, this isn't quite as easy as using the same kind of service for residential phone numbers, since cellular carriers generally don't release these details into the public domain. Although that's not to say you can't find out the details you need - it just means that you're going to have to pay a small fee for cellular reverse lookup, as opposed to the free service for residential numbers.

How Do I Find Cellular Reverse Lookup Companies?

The first thing you need to do is find details of the companies that actually offer cell phone reverse number lookups, but this can be done easily and quickly by using any Internet search engine such as Google.

Although you may see adverts for companies that offer the service free of charge, don't be taken in by their promises, as you can pretty much guarantee that they're dummy ads, and are only there to lead you to the paying sites anyway. The good news is that, even though you have to pay for the service, it's a one-off amount, and you can then use the information as many times as you want.

What Are Some Of The Better Companies?

One of the best, and most respected, cellular reverse lookup companies is Reverse Phone Detective, which not only allows you to search for both residential and cell phone numbers, but offers full background checks, any criminal history, financial status and much more. Their fee is pretty fair too, with prices ranging from $29.95 per year to $39.95 for the deluxe lifetime membership.

Another highly popular provider of this type of information is Reverse Mobile, which has access to over 70% of all cellular numbers in the US, as well as over 95% of all unlisted phone numbers. They offer the same kind of information as Reverse Phone Detective, although the price differs slightly. You can have their premium service, which is the same unlimited lifetime one as Reverse Phone Detective and at the same $39.95, but their cheaper options only offer 3 months for $29.95 or 6 months for $34.95.

Whatever you need cell phone reverse number lookup for, it's good to know that you can get all the information you need for a small fee. Which, if you think about it, may just save you a whole lot more in the long run...

If you would like to try a reverse cellphone look up right now, check out http://www.ReverseCellPhoneLook-Up.com

Steve Somerton writes informative articles on various subjects including Cell Phone Reverse Number Lookup Companies. You are allowed to publish this article in its entirety provided that author's name, bio and website links must remain intact and included with every reproduction.

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Virtual Private Networks - The Basics

Virtual Private Networks (VPNs) can extend a local area network (LAN) over the Internet to remote networks and remote client machines. A VPN uses the Internet to route LAN traffic from one location to another by encapsulating the data inside encrypted IP packets. The encrypted packets are unreadable by intermediary Internet devices and can contain any kind of network communications - such as file and printer sharing, e-mail, remote procedure calls, and database access.

VPNs can be setup using server computers, firewalls or routers. Client access to the VPN can be made using client-side VPN software or by connecting to an ISP that supports the VPN protocol.

VPNs solve the problem of accessing private servers over the Internet through a combination of IP encapsulation, cryptographic authentication and data payload encryption.

IP Encapsulation
IP encapsulation provides a way to protect the data while in transit between the remote client and the private LAN. Computers outside the VPN should not be able to snoop on the traffic exchanged between the remote client and private server or be able to insert their own data into the communication stream. This is accomplished by creating what people refer to as a private and protected "tunnel" through the public Internet. When an IP packet contains another IP packet this is called IP encapsulation, and it provides a mechanism to refer to a host within a private network when a direct network connection may not exist. When this is combined with data encryption then we've effectively created our virtual tunnel.

Cryptographic Authentication
Cryptographic Authentication is used to securely validate the identity of the remote client so that the private LAN can determine what level of security should be applied to that user. VPNs use the authentication process to determine whether or not a remote user can participate in the encrypted tunnel, and for exchanging the public key that will subsequently be used for data encryption.

Data Payload Encryption
Data Payload Encryption uses a public key to encrypt the data field of the IP encapsulated packet. That is, data payload encryption is exactly like normal IP except that the data has been encrypted. It does not encrypt the header information, so details of the private network can be gleaned by analyzing the header information.

Advantages and Disadvantages
Compared to Wide Area Networks (WANs), VPNs offer some advantages but, also, present some disadvantages.

 Advantages - cheaper than WANs - easier to setup than WANs Disadvantages - slower than WANs - less reliable than WANs - less secure than isolated WANs

Example
Although there are a number of ways to configure a VPN here is an example of one scenario that is fairly common -- an employee wishes to work from home and exchange data between their home machine and a private web server on the corporate network. There are two important processes here -- the process of negotiating and building a VPN session, and the process of protecting and handling the data within an existing VPN connection. Here I'll briefly describe the latter and leave the former as a potential topic for a future article.

Suppose we have the following:
(a) a VPN client with a public IP address of 66.123.77.196 and a private IP address of 192.168.0.202 (provided by the corporation's DHCP server).
(b) a VPN server on the corporate network with two interfaces -- a public interface to the Internet that uses 168.156.192.75 and an interface to the private network with an IP of 192.168.0.101
(c) a web server on the corporate network with an IP address of 192.168.0.102

Prior to creating a VPN session the client host has one interface and a connection to the Internet through an ISP. The client machine can communicate with any host on the Internet but can not access the web server on the private network 192.168.0.X. After the VPN session has been created then the client host has 2 interfaces -- the original interface to the Internet and a new VPN interface. The new VPN interface becomes the default gateway -- that is, all packets will initially travel through the new interface. However, the VPN interface is not a physical network card -- it doesn't physically connect to anything. The VPN interface is used to encrypt and encapsulate packets that are subsequently sent as the payload of a new, outer packet. It is the outer packet that is sent out over the Internet (using the original interface) to the corporate VPN server.

The inner packet will use the client's private IP of 192.168.0.202 as the source IP address and the web server's private IP of 192.168.0.102 as the destination address. The VPN client encrypts the data field of the inner packet and this inner packet then becomes the payload of an outer packet. The outer packet uses the client's public IP of 66.123.77.196 as the source IP address and the public interface of the VPN server (168.156.192.75) as the destination IP. The IP encapsulated packet is then sent to the ISP and out over the Internet.

When the IP encapsulated packet reaches the VPN server at the edge of the private network it will unwrap the inner packet and decrypt its data field. Since the VPN server also has an interface to the private network it will then be able to forward the inner packet to the destination web server. When data is sent from the web server back to the client then the process is reversed -- that is, the VPN server handles the encryption/encapsulation and the VPN client is responsible for unwrapping/decoding.

Steve Leytus is a senior software engineer and develops applications for NutsAboutNets.com. For more information about low cost, PC-based diagnostic tools for installing, optimizing and trouble-shooting 802.11 (Wi-Fi) wireless networks please visit http://www.NutsAboutNets.com

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