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Sabtu, 09 Agustus 2008

All You Wanted to Know About Proxies

Though a common term in the computer age today, it needn’t bring out doubt in users. We all know what a proxy is, something that’s used instead of the real thing, especially when it comes to dubious deals where you send a proxy to carry out an intended act instead of the real person. Similarly in the world of servers, proxy servers are fast gaining popularity. A closed proxy can be accessed by limited people and permits using someone else's computer to conceal your identity and/or location. An open proxy refers to a proxy server that can be accessed by anyone who uses the Internet.

By and large, a proxy server permits users in a particular network group to accumulate and further internet services such as DNS or web pages. Consequently their bandwidth usage is lessened and controlled. In case of any open proxy, however, every user on the Internet can avail of this forwarding service.

The open proxies, also known as anonymous open proxies, allow users to hide their true IP address from the service they access. In fact the use of proxies has at times been intended to abuse or disrupt a service. This obviously includes breaking its terms of service or the law. For such reasons open proxies have been viewed as problematic from time to time. They have been under severe scrutiny because school children, as well as office staff have been known to use it time and again to access restricted sites during work hours.

The use of proxies can work to your advantage as it ensures that no one can take advantage of you in this visual world. This is very true in reference to users who use social forums on a daily basis. Users may be getting onto such sites to gain knowledge, learn about latest developments or also increase their social networking base, but there are always those who are on the prowl to find the vulnerable and easy targets. And just incase you’re targeted your life could be a mess. Your credit card accounts could be tampered with, someone would know all your details and you could be stalked or blackmailed and worse still you’d find yourself visiting sites and forums which you never have. You could even be made the next porn star. For your identity to be protected and enhancement of online security, the use of proxies works just fine. This permits you to access facebook, hotmail, youtube, and others without a worry. These may be popular as fun sites, but they also promote educational needs, helping you learn along the way or even have a secure social networking group you can depend on. Along the way you can make alliances that can assist you in getting a job, help make business or even make a friend. The opportunities are endless, as long as you keep yourself safe from prowlers.

A computer can be run on an open proxy server without the owner knowing this. This is possible because of misconfiguration of proxy software used in a particular computer. Malware, viruses, trojans or worms are all used for this purpose. Open proxies are slow, as slow as 14400 baud (14.4 kbit/s), or even below 300 baud. At times they could keep alternating between fast to slow every minute. PlanetLab proxies are quicker and were deliberately put in place for public use.

Despite the popularity of proxies, because of the controversies surrounding them, there are systems in place that don’t permit their usage everywhere. IRC networks routinely test client systems for identified open proxy types. Mail servers can be configured to routinely check mail senders for proxies with the help of proxycheck software. Mail servers can also consult various DNSBL servers that block spam. Such servers also list open proxies and help in blocking them.

Nevertheless, anonymous open proxies have also been hailed because they enhance ambiguity, in other words security when browsing the web or engaging in other internet services. The use of proxies conceals any users’ true IP address. This is a boon because your IP address can be used against you. It can help miscreants construe information about any user and accordingly hack into his/her computer. Open proxies are being looked upon as the next big thing when it comes to dodge efforts at Internet censorship by governments and concerned organizations. There are various web sites that make available updated lists of open proxies on an ongoing basis.

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Hughesnet

Hughesnet is a form of high-speed Internet service which utilizes telecommunications satellites in earth orbit to provide Internet access to consumers.

A hughesnet connection is basically an arrangement in which the upstream (outgoing) and the downstream (incoming) data are sent from, and arrive at, a computer through a satellite. Each subscriber's hardware includes a satellite dish antenna and a transceiver (Modem) that operates in the microwave portion of the radio spectrum. Your computer, through the satellite modem, broadcasts requests to a satellite dish antenna that sits on top of your home or business. The dish antenna then sends and receives signals from satellites that orbit some 22,300 miles above the equator. As long as your dish maintains a clear view of the southern sky (in the U.S.), you receive broadband Internet access. Currently, satellite broadband is slower in both the uplink and downlink, when compared to a DSL Internet service, for example.

Satellite Internet services are of two types. One-way service uses DVB-IP (Digital Video Broadcast- Internet Protocol), which is only for inbound connectivity. Hence, one way service is ideally suited for webpage viewing.
Two-way services provide complete broadband services to the users. Two-way service enables high-speed access for both download and upload. This platform is ideal for home, offices and small and medium enterprises. In this two-way satellite Internet connection, the upstream data is usually sent at a slower speed than the downstream data arrives. Thus, the connection is asymmetric. The upload speed will always be slower than the download speed. A dish antenna, measuring about one and half feet high by three feet wide by three feet deep, transmits and receives signals. Uplink speeds are variable and nominally 128 to 500 Kbps for a subscriber using a single or multiple computers. The downlink occurs at speeds ranging from about 700 Kbps to 2000 Kbps, depending on factors such as Internet traffic, the capacity of the server, the sizes of downloaded files and upon the plan provided by the service providers.
Satellite Internet systems are an excellent option for people in rural areas where Digital Subscriber Line (DSL) and cable modem connections are not available. Now, because of technical development it becomes a good option for urban subscriber also who needs high speed Internet. A satellite installation can be used even where the most basic utilities are lacking, if there is a generator or battery power supply that can produce enough electricity to run a desktop computer system. The two-way satellite Internet option offers an always-on connection that bypasses the dial-up process. In this respect, the satellite system resembles a cable modem Internet connection. But this asset can also be a liability, unless a firewall is used to protect the computer against hack attempts.
The nature of the satellite internet connection is good for web browsing and for downloading of files. Because of long latency compared with purely land-based systems, interactive applications such as online gaming are not compatible with satellite networks. In a two-way geostationary-satellite Internet connection, a transaction requires two round trips between the earth's surface and transponders orbiting 22,300 miles above the equator. This occurs in addition to land-based data transfer between the earthbound satellite system hub and the accessed Internet sites. The speed in such a connection is theoretically at least 0.48 second (the time it takes an electromagnetic signal to make two round trips at 186,000 miles per second to and from a geostationary satellite), and in practice is somewhat longer. Satellite systems are also prone to rain fade (degradation during heavy precipitation) and occasional brief periods of solar interference in mid-March and late September, when the sun lines up with the satellite for a few minutes each day. Rain fade and solar interference affect all satellite links from time to time, not just Internet systems.
So now there is an amazing internet service called broadband satellite Internet services for those who can't get a cable to their home or office or for those who have no access to DSL. It provides a super-fast, independent 2-way duplex, always-on Internet connectivity that delivers flexible, IP-based services on a single platform.
All agencies with Satellite Internet services utilize the same technology, but have different pricing packages and customer service. But, if you talk about pricing packages, better internet services and customer services, the HughesNet® is one of the best among all.

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