Kamis, 19 Januari 2012

GATEWAY DAN DNS

Akhirnya bisa melanjutkan bahasan tentang IP. Oke.. sebelumnya kita sudah bahas dan memahami alokasi dan aturan pemakaian IP. disini .Dalam dunia persilatan jaringan, pasti akan sering menemukan dua istilah aneh ini, yaitu :

1. Gateway

2. DNS (Domain Name Server)

Sudah pernah dengar, atau lihat ? ya, pasti sering kita temui jika sedang setting koneksi internet dengan ISP (speedy, IM2, SMART dll). Mengutip dari mbah wiki (teman dekat mbah google ) :

Gateway (telecommunications), a computer or a network that allows or controls access to another computer or network

Seperti namanya Gateway (Gate = Gerbang, Way = Jalur/jalan). Secara sederhana Gateway merupakan “pintu” pertama, jalur pertama yang harus dilewati paket2 data untuk dapat masuk ke network yang lain. Apa penting nya ?? sangat penting.

Ibaratkan kita berada di dalam rumah, lalu kita ingin “mengantarkan” masakan kita ke tetangga sebelah. Pasti jalan yang kita lewati pintu depan rumah kan ? masa lewat jendela :D. Nah, begitu pula jika kita ingin pergi ke toilet, pasti kita menuju pintu toiet (masa pintu depan rumah,, muter2 dong..) “Maskan” tadi adalah paket data yang kita kirimkan, dan pintu2 tadi adalah gatewaynya. Jadi, jangan sampai kita salah pilih gateway ! bisa dipastikan, network yang kita buat (internet) akan mengalami masalah, sebab paket2 datanya salah kirim ! hehe…

Baiklah,, itu tadi filosofi dari gateway. Sekarang kita lihat dari sisi teknisnya. Biar gampang lihat gambar aja ya …

Senin, 20 Oktober 2008

10 Tips Hemat Energi Pada PC Dan Laptop

10 Tips Hemat Energi Pada PC Dan Laptop

Written by Iwan Nurwijayanto on October 20, 2008.

Di bawah ini adalah sepuluh tips yang dapat Anda gunakan untuk menghemat pemakaian energi pada pc dan laptop.

1. Atur pencahayaan dan kontras monitor
Mungkin bagi orang yang awam atau pemula dalam menggunakan komputer, mereka jarang sekali memperhatikan pengaturan monitor mereka. Yang dimaksud dalam hal ini adalah tingkat pencahayaan dan kontras yang diatur terlalu tinggi akan bisa menghabiskan banyak energi. Maka untuk itu anda harus bisa mengatur pencahayaan dan kontras tersebut, untuk mengatur pencahayaan dan kontras monitor tersebut gunakan tombol yang berada di bawah monitor.

2. Matikan monitor
Tips yang ke-dua adalah dengan mematikan monitor, terutama monitor yang jenisnya adalah jenis CRT (Cathode Ray Tubel), karena monitor jenis tersebut lebih banyak mengkonsumsi tenaga listrik. Jadi, jika anda ingin meninggalkan PC tersebut dalam waktu yang lama, sebaiknya matikan monitor anda.
Anda juga dapat menyetting Windows agar secara otomatis langsung mati dalam beberapa waktu tertentu, itu bisa dilakukan dengan cara, klik “Control Panel-Options”. Dalam “Power Options Properties” klik tab “Power Schemes”. Lalu klik tanda panah di bagian “Power Schemes” lalu pilih “Home/Office desk”. Lalu pilih waktu yang diinginkan pada “Turn Off Monitor” dan klik “Apply” dan “OK”.

3. Matikan Hard disk
Meskipun kita tidak sedang melakukan apa pun pada komputer kita, tapi data anda akan selalu dibaca dari hard disk (oleh sistem operasi dan beberapa aplikasi). Karena alasan ini, hard disk hard disk akan terus menerus berputar dan tentu saja ini akan menghabiskan energi. Jika anda ingin meninggalkan PC anda dalam waktu yang lama, maka sebaiknya matikan hard disk PC anda. Pada “Power Options Properties” lalu klik tab “Power Schmes”. Klik tanda panah di bagian “Power Schemes” dan pilih “Home/Off desk”. Kemudian klik “Turn off hard disk” dan pilih waktunya. Lalu klik “Apply” dan “Ok”.

4. Matikan peralatan lainnya
Matikanlah peralatan lainnya seperti, speaker, modem eksternal, scanner, Zip drive dan printer. Karena peralatan itu sangat menghabiskan banyak energi. Seringkali orang meninggalkan peralatan tersebut dalam keadaan aktif, bahkan saat kita sedang keluar dalam waktu yang lama.

5. Mode Hibernate
Mode hibernate ini adalah fasilitas untuk melakukan shut down, tapi tidak menutup atau mematikan aplikasi yang sedang kita buka tadi. Hal ini dapat dilakukan dengan cara Mode “Hibernate”. Dengan mode ini, isi memory utama (RAM) akan tersimpan dalam hard disk. Cara melakukan mode hibernate adalah sebagai berikut, pada “Power Options” kliklah tab “Hibernate”. Lalu klik kotak dekat “Enable Hibernation”. Klik juga pada tab “Advanced”. Dalam bagian “When I Press the power button” lalu klik tanda panahnya kemudian klik “Hibernate”. Klik “Apply” dan “Ok”. Setelah itu tekan tombol “Power” pada komputer anda. Mode hibernate sudah berfungsi, tekan tombol “Power” sekali lagi, komputer anda akan menyala dan akan otomatis membuka aplikasi yang telah anda buka tadi.

6. Mode Standby
Agar bisa menghemat energi, sebaiknya pengaturan monitor dan hard disk berada di bagian yang paling rendah pada mode standby. Jika anda ingin meninggalkan PC sebentar, sebaiknya aktifkan mode standby. Namun yang harus anda ketahui adalah, saat mode standby aktif data-data yang belum anda simpan dapat rusak atau hilang kalau PC anda mengalami kerusakan. Sebaiknya simpan dahulu data atau dokumen anda sebelum anda mengaktifkan mode standby ini. Mode standby dapat dilakukan dengan cara, klik “Start-Turn Off computer” lalu klik “Stanby”.

7. Gunakanlah UPS
Gunakanlah selalu alat UPS, karena alat ini bisa membantu penyelamatan data atau shut down saat terjadi mati listrik. Untuk mengatur peralatan UPS dan mengkonfigurasikan alat tersebut “Power Option Properties” lalu pilih tab UPS. Bagian status dalam tab UPS menampilkan perkiraan jumlah menit yang dapat didukung UPS terhadap PC anda. Sebenarnya banyak cara untuk mengkonfigurasikan UPS, namun hal ini tergantung dari model dan kapasitas UPS yang digunakan.

8. Baterai Laptop
Jika anda men-charge baterai laptop, pastikan proses charge-nya selesai. Karena proses charge yang dilakukan setengah-setengah lalu dilanjutkan kembali, itu malah akan menghabiskan banyak energi. Jika anda ingin berpergian, sebaiknya bawa selalu baterai tambaha. Untuk menghemat pemakaian baterai. Anda bisa memanfaatkan feature Hibernate/Suspended atau gunakan soket listrik yang dihubungkan ke stopkontak.

9. Port USB
Jika saat anda menggunaka laptop dan saat itu anda memasukkan salah satu ke port USB di laptop, sebaiknya kalau sudah selesai langsung dilepaskan saja. Karena peralatan yang masih tertancap di port USB, itu juga dapat menghabiskan tenaga pada PC atau laptop anda. Sebaiknya lepaskan alat tersebut bila pemakainnya dirasa sudah cukup.

10. Skema Pemakaian Energi Laptop
Biasanya produsen-produsen laptop juga menyertakan feature dan software power management. Software ini sangat berguna sekali bagi para konsumen laptop, karena software ini mampu mengatur pemakaian baterai dan daya listrik yang sedang digunakan. Di software ini ada beberapa pilihan yang dapat digunakan untuk mengetahui beban hard disk dan energi lain yang sedang digunakan oleh laptop. Di antaranya mengetahui kecepatan prosessor atau pencahayaan monitor yang tepat untuk dapat menghemat baterai. Software ini sekaligus dapat menjadi pengawas bagi kita dalam menggunakan laptop.

Sabtu, 18 Oktober 2008

The Super Duper Problem Fixer

The Super Duper Problem Fixer
by: Ray geide
http://www.articlecity.com/articles/computers_and_internet


One of our customers pointed out a new program to me and wanted me to check it out. This program called itself a bug fixer. It was a sharp looking program and claimed to fix bugs on the user's computer that he didn't even know existed.

It sounded like a super duper problem solver until I downloaded it and took a closer look. Being a programmer I quickly saw behind its smoke and mirrors. It actually only performed six of the over 1000 cleaning processes which our A1Click Ultra PC Cleaner and RegVac Registry Cleaner do.

Even though it did little compared to our programs, it found 504 problems. How can that be? My computer was clean. The program did not show any details about the results but wanted $30 before it would clean them. I'll never know for sure about those results, but I suspect that they were fabricated and that the true number of problems was 0.


There are many shady developers out there that just want to make a quick buck. I doubt this bug fixer program will even be around in a year.

This provides a good lesson to anyone. Be sure to purchase software from a trusted developer and don't buy a program just because it looks nice.

We have been in the software business since 1996 and are continually improving our programs. You will not hear hype and lies from us. Our programs may not look that good on the surface, but under the hood they are super. When you purchase our programs, all future updates are free.

If you haven't tried RegVac Registry Cleaner and A1Click Ultra PC Cleaner, try them today.

Selasa, 14 Oktober 2008

The Battle of the Browsers – The History and the Future of Internet Browsers

The Battle of the Browsers – The History and the Future of Internet Browsers
by: Nicholas C Smith. http://www.articlecity.com/articles/computers_and_internet


With Internet Explorer 8 now available, can Microsoft hope to retain market dominance over fierce open source rivals such as Mozilla's Firefox or the feature packed Opera web browser. Can history give us a clue to what the future of web browsers/browsing might hold? How did Netscape Navigator go from having a dominant 89.36% market share of all web browsers in 1996 and yet only 3.76% by mid 1999?

Let us take a journey that will begin long before even the intellectual conception of Internet Explorer, that will glance at its long defeated rivals, examine the current browsers available and will end with a prediction of what the future of browsing will offer us – and which browser(s) will still be around to offer it.

People often think that Internet Explorer has been the dominant web browser since the golden age of the internet began. Well for a very long time now it has indeed been the most popular browser and at times been almost totally unrivalled. This was mainly a result of it being packaged free with Microsoft Windows, in what some would later call a brutal monopolisation attempt by Microsoft. The last few years however have heralded the arrival of new, possibly superior browsers. Mozilla's Firefox has been particularly successful at chipping away at Explorers market dominance. So where did it all begin, and why were Microsoft ever allowed to have a hundred percent market dominance?

Origins

The truth is they never did have total dominance, but at times they have come very close. Microsoft actually entered the Browser Battle quite late on. Infact a man named Neil Larson is credited to be one of the originators of internet browsers, when in 1977 he created a program – The TRS-80 - that allowed browsing between “sites” via hypertext jumps. This was a DOS program and the basis of much to come. Slowly other browsers powered by DOS and inspired by the TRS 80 were developed. Unfortunately they were often constricted by the limitations of the still fairly young internet itself.

In 1988, Peter Scott and Earle Fogel created a simple, fast browser called Hytelnet, which by 1990 offered users instant logon and access to the online catalogues of over five thousand libraries around the world – an exhilarating taste of what the internet, and web browsers, would soon be able to offer.

In 1989 the original World Wide Web was born. Using a NeXTcube computer, Tim Berners-Lee created a web browser that would change how people used the internet forever. He called his browser the WorldWideWeb(http://www., which is still likely to sound familiar to internet users today. It was a windowed browser capable of displaying simple style sheet, capable of editing sites and able to download and open any file type supported by the NeXTcube.

In 1993 the first popular graphical browser was released. Its name was Mosaic and it was created by Marc Andreessen and Eric Bina. Mosaic could be run on both Unix, and very importantly, on the highly popular Microsoft Windows operating system (incidentally it could also be used on Amiga and Apple computers). It was the first browser on Windows that could display graphics/pictures on a page where there was also textual content. It is often cited as being responsible for triggering the internet boom due to it making the internet bearable for the masses. (It should be noted that the web browser Cello was the first browser to be used on Windows – but it was non graphical and made very little impact compared to Mosaic).

The Browser Wars - Netscape Navigator versus Internet Explorer

Mosaic's decline began almost as soon as Netscape Navigator was released (1994). Netscape Navigator was a browser created by Marc Andreessen, one of the men behind Mosaic and co-founder of Netscape Communications Corporation. Netscape was unrivalled in terms of features and usability at the time. For example, one major change from previous browsers was that it allowed surfers to see parts of a website before the whole site was downloaded. This meant that people did not have to wait for minutes simply to see if the site they were loading was the actual one the were after, whilst also allowing them to read information on the site as the rest of it downloaded. By 1996 Netscape had almost 90% market dominance, as shown below.

Market Share Comparisons of Netscape Navigator and Internet Explorer from 1996 to 1998

....................Netscape.......IE
October 1998..........64%.........32.2%
April 1998............70%.........22.7%
October 1997..........59.67%......15.13%
April 1997............81.13%......12.13%
October 1996..........80.45%......12.18%
April 1996............89.36%.......3.76%

In these two years Netscape clearly dominated the internet browser market, but a new browser named Internet Explorer was quickly gaining ground on it.

Microsoft released their own browser (ironically based on the earlier Mosaic browser which was created by one of the men now running Netscape), clearly worried about Netscape's dominance. It was not so much the worry that it would have a 100% market share of internet browsers on their Windows operating system, but more the worry that browsers would soon be capable of running all types programs on them. That would mean foregoing the need for an actual operating system, or at the most only a very basic one would be needed. This in turn would mean Netscape would soon be able to dictate terms to Microsoft, and Microsoft were not going to let that happen easily. Thus in August 1995, Internet Explorer was released.

By 1999 Internet explorer had captured an 89.03% market share, whilst Netscape was down to 10.47%. How could Internet Explorer make this much ground in just two years? Well this was down to two things really. The first, and by far the most important was that Microsoft bundled Internet Explorer in with every new copy of Windows, and as Windows was used by about 90% of the computer using population it clearly gave them a huge advantage. Internet Explorer had one other ace it held over Netscape – it was much better. Netscape Navigator was stagnant and had been for some time. The only new features it ever seemed to introduce were often perceived by the public as beneficial for Netscape's parent company rather than Netscape's user base. (i.e., features that would help it monopolise the market). Explorer, on the other hand, was given much attention by Microsoft. Regular updates and excellent usability plus a hundred million dollar investment would prove too much for Netscape Explorer.

2000 – 2005

These years were fairly quiet in the Battle of the Browsers. It seemed as if Internet Explorer had won the war and that nobody could even hope to compete with it. In 2002/2003 it had attained about 95% of the market share – about the time of IE 5/6. With over 1000 people working on it and millions of dollars being poured in, few people had the resources to compete. Then again, who wanted to compete? It was clearly a volatile market, and besides that everybody was content with Internet Explorer. Or were they? Some people saw faults with IE – security issues, incompatibility issues or simply bad programming. Not only that, it was being shoved down peoples throats. There was almost no competition to keep it in line or to turn to as an alternative. Something had to change. The only people with the ability and the power to compete with Microsoft took matters into their own hands.

Netscape was now supported by AOL. A few years prior, just after they had lost the Browser Wars to Microsoft, they had released the coding for Netscape into the public domain. This meant anybody could develop their own browser using the Netscape skeleton. And people did. Epiphany, Galeon and Camino, amongst others, were born out of Netscape's ashes. However the two most popular newcomers were called Mozilla and Firefox.

Mozilla was originally an open sourced project aimed to improve the Netscape browser. Eventually it was released as Netscape Navigator 7 and then 8. Later it was released as Mozilla 1.0.

Mozilla was almost an early version on another open source browser, Firefox. With it being an open source the public were able to contribute to it - adding in what features it needed, the programming it required and the support it deserved. The problems people saw in Internet Explorer were being fixed by members of the open sourced browser community via Firefox. For instance, the many security issues IE 6 had were almost entirely fixed in the very first release of Firefox. Microsoft had another fight on their hands.

2005 – Present

Firefox was the browser that grew and grew in these years. Every year capturing an even larger market share percentage than before. More user friendly than most of its rivals along with high security levels and arguably more intelligent programming helped its popularity. With such a large programming community behind it, updates have always been regular and add on programs/features are often released. It prides itself on being the peoples browser. It currently has a 28.38% market share.

Apple computers have had their own browser since the mid 1990's – Safari - complete with its own problems, such as (until recently) the inability to run Java scripts. However most Apple users seemed happy with it and a version capable of running on Windows has been released. It has had no major competitor on Apple Macs, and as such has largely been out of the Browser Wars. It currently holds a 2.54% market share and is slowly increasing.

Internet Explorer's market share has dropped from over 90% to around 75%, and is falling. It will be interesting to see what Microsoft will attempt to regain such a high market share.

Opera currently holds 1.07%.

Mozilla itself only has a 0.6% market share these days.

The Future of Web Browsing

Web browsers come and go. It is the nature of technology (if such a term can be used), to supplant inferior software in very short periods of time. It is almost impossible for a single company to stay ahead of the competition for long. Microsoft have the advantage of being able to release IE with any Windows using PC. That covers over 90% of the market. They also have the advantage of unprecedented resources. They can compete how they wish for as long as they wish. So there is no counting IE out of the future of web browsing.

Safari is in a similar position, being easily the most popular Mac web browser. Its long term survival is dependant upon Apple and the sale of their computers.

These are the only two browsers that are almost guaranteed another five years of life, at least. Firefox may seem like another candidate, but the public is fickle, and one bad release, or if it seriously lags behind the new Internet Explorer 8 for long, could easily see its popularity quickly descend into virtual oblivion.

However, it seems likely community driven browsers, such as Mozilla and Firefox, will be the only types of browser capable of competing with the wealthy internet arm of Microsoft in the near future.

As for web browsing itself, will it change any time soon? Well it already has for some online communities. For example, if you want to buy clothes you could try entering an online 'world' creating an online virtual You to go from 'shop to shop' with, looking at products and trying/buying what you see. Some 'worlds' allow you to recreate yourself accurately including weight and height and then try on things apparel such as jeans to give you an idea of how you would look in that particular item.

Will 'worlds' like this destroy normal web browsers such as IE ? - It seems unlikely. Traditional web browsers provide such freedom and ease of access that it is hard to see any other alternative taking over. However they are part of the new, 'thinking out of the box' wave of alternatives that some people will find attractive, and really who knows what the future will bring.

Internet And Business Online – The Act Of Interdependence

Internet And Business Online – The Act Of Interdependence
by: Scott Lindsay http://www.articlecity.com/articles/computers_and_internet

The best role of business online is that of interdependency. We’ve all heard the old saying, “No man is an island.” When it comes to online business this is especially true.

If a business owner who takes their business into the online world determines they will be self reliant and never accept the help of anyone then that individual will not be in business long enough to change their minds.

It is accepted fact that the greatest tool for long-term exposure to your website is through Search Engine Optimization (SEO). Without it potential customers can’t find you. It is unreasonable to expect that you can adequately develop a website without optimizing your website for the best possible search engine ranking.

Search engines also place a high value on sites that have links placed on existing sites. These ‘backlinks’ demonstrate to search engines that others trust your site. By placing your link on their website these other businesses indicate a trust and recommendation for your site.

In effect the two strategies listed above rely exclusively on what others can do for you when it comes to your online business.

Shirley Temple once proclaimed in her movie Rebecca of Sunnybrook Farm, “I’m very self-reliant.” American westerns are filled with lines dealing with pulling yourself up by your bootstraps and holding down the fort. Many of us have grown up to believe if we want something done right we have to do it ourselves.

This thinking is in opposition to the rules associated with an online business.

The online world can only exist because people share. Individuals share technology, but the also share links, reviews, blogs, forums and a wide range of other marketing strategies that find a commingling of interdependency.

In online business you are as dependent on others as they may be on you. Unlike the word ‘dependent’, the term interdependent indicates a mutual dependency. In other words you are depending on others to help provide links back to your site while they are equally dependent on you (or others) for the success of their business.

Have you really taken a proactive approach to networking? It’s possible you are reading this today and you’ve never considered asking someone else to place a link to your site on his or her online business site.

It can feel awkward depending on others to achieve online success especially if you’ve been lead to believe reliance on others is also a sign of imposing on their otherwise brilliant generosity.

I suppose it could be a deep-seated sense of pride that makes it hard to consider the need to ask others for help. However, the truth is depending on others is really what has made the Internet possible. The growth of this online world is comprised of a link of computers, networks and servers that are connected in a way that provides the maximum benefit for all.

Building an online business can feel a bit like trying to build a house of cards. Without the ability to rely on the other ‘cards’ around you it is virtually impossible to build.

Interdependence. This is the essence of online business.