Network Troubleshooting

Network Troubleshooting

Sebelum kita melakukan troubleshooting pada jaringan dan menggunakan beberapa toolnya (alat software/hardware), ada baiknya kita memahami apa itu Network Troubleshooting. Network troubleshooting dapat diartikan sebagai cara atau teknik mengenal (recognizing) dan mendiagnosa (diagnosing) masalah-masalah jaringan dengan tujuan untuk menjaga agar jaringan kita tetap berjalan dengan normal.

Sebagai seorang administrator jaringan, teknisi jaringan, dan spesialis jaringan, perhatian utama kita adalah memelihara konektivitas dari semua perangkat jaringan (dalam sebuah proses biasanya kita sebut fault management). Kita juga secara rutin dan berkelanjutan haruslah mengevaluasi dan >meningkatkan kinerja jaringan. Karena terkadang masalah-masalah jaringan yang serius dapat mengindikasikan masalah kinerja dari sebuah jaringan sehingga dengan perhatian yang lebih serius dapat membantu kita mengetahuiny lebih dini sebelum menjadi masalah yang lebih serius.

Network troubleshooting yang akan kita lakukan adalah berbasiskan pada layananlayanan di TCP/IP atau Internet. Beberapa alat troubleshooting untuk software yang >digunakan berbasiskan pada platform sistem operasi (OS) Linux dan Windows. Hal-hal yang sering terjadi dalam jaringan di antaranya adalah:

1. Masalah Konektivitas

Masalah konekvitas terjadi ketika suatu end stations (seperti komputer, hub/switch, router) tidak dapat berkomunikasi satu sama lain baik di lingkungan jaringan LAN (local area network) maupun WAN (wide area network). Menggunakan alat-alat manajemen berupa software maupun hardware, kita sering dapat mengatasinya bahkan sebelum pengguna lainnya mendapat peringatan. Masalah konektivitas meliputi:

a. Kehilangan Konektivitas (Loss of connectivity ) - Ketika para pengguna tidak dapat mengakses jaringan kita maka keefektifan organisasi Anda adalah lemah sehingga Anda harus dengan segera memperbaikinya.<

b. Konektivitas terputus-putus atau tidak stabil (Intermittent connectivity) – Kendati para pengguna memiliki akses ke sumber daya jaringan beberapa kali tetapi mereka kadangkala masih menghadapi koneksi jaringan yang 'mati' (periods of downtime). Masalah konektivitas yang terputus-putus dapat mengindikasikan bahwa jaringan kita berada pada ambang kerusakan yang lebih parah. Jika konektivitas tidak menentu (aneh) segeralah kita melakukan pengamatan dan penyelidikan pada masalah tersebut.

c. Masalah Timeout - Timeouts menyebabkan kehilangan konektivitas (loss of connectivity)tetapi lebih sering dihubungkan dengan kinerja jaringan yang buruk.


2. Masalah Kinerja Jaringan

Jaringan kita memiliki masalah kinerja ketika ia tidak dapat beroperasi secara efektif.Sebagai contoh, waktu respon jaringan yang lambat, jaringan tidak stabil seperti biasanya, dan para pengguna banyak yang mengeluh bahwa jaringan melayani pekerjaan mereka lebih lama. Beberapa masalah kinerja yang bersifat sewaktu-waktu muncul seperti duplikasi alamat dan laju utilisasi jaringan yang selalu konsisten tinggi dapat saja terjadi. Jika Anda secara teratur dapat memeriksa jaringan untuk masalah kinerja, Anda dapat memperpanjang fungsi konfigurasi jaringan yang ada dan merencanakan peningkatan kualitas jaringan dibandingkan harus menunggu akibat atau dampak dari masalah tersebut terhadap produktivitas pengguna.

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Diagram Alir Network Troubleshooting

Diagram Alir Network Troubleshooting





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BackTrack 3.0

BackTrack 3.0: Free Download

DOWNLOAD HERE

BackTrack description



BackTrack is a Slackware and SLAX-based live CD with a collection of security and forensics tools.

BackTrack is a Slackware and SLAX-based live CD with a collection of security and forensics tools.

BackTrack distribution was created by merging Auditor Security Linux with WHAX (formerly Whoppix).

Combining the best features from both distributions, and paying special attention to small details, this is probably the best version of either distributions to ever come out.

Based on SLAX (Slackware), BackTrack provides user modularity. This means the distribution can be easily customised by the user to include personal scripts, additional tools, customised kernels, etc.


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New Home Network Technology

New Home Network Technology

Previous Tira want to say Happy Idul-Adha 1429H, not long felt Tira not renew writing this blog, do not take to heart the purpose of this blog, but because of a busy time, this time Tira will try again to discuss network technology
New developments in home networks affect more than just home offices and entertainment systems. Some of the most exciting advances are in healthcare and housing.

In healthcare, Wireless Sensor Networks (WSNs) let doctors monitor patients wirelessly. Patients wear wireless sensors that transmit data through specialized channels. These signals contain information about vital signs, body functions, patient behavior and their environments. In the case of an unusual data transmission -- like a sudden spike in blood pressure or a report that an active patient has become suddenly still -- an emergency channel picks up the signal and sends medical services to the patient's home.
The housing industry is another important field for home network technology development. Bill Gates owns one of the few smart houses in existence, but someday, we might all live in one. A smart house is a fully networked structure with functions that can be controlled from a central computer, making it an ideal technology for homeowners who travel frequently or for homeowners who simply want it all.

Builders are beginning to offer home network options for their customers that range from the primitive -- installing Ethernet cables in the walls -- to the cutting-edge -- managing the ambient temperature from a laptop hundreds of miles from home. In one trial experiment called Laundry Time, Microsoft, Hewlett Packard, Panasonic, Proctor & Gamble and Whirlpool demonstrated the power of interfacing home appliances. The experiment networked a washing machine and clothes dryer with a TV, PC and cell phone. This unheard-of combination of networked devices let homeowners know when their laundry loads were finished washing or drying by sending alerts to their TV screens, instant messaging systems or cell phones. Research and development also continues for systems that perform a wide variety of functions -- data and voice recognition might change the way we enter, exit and secure our homes, while service appliances could prepare our food, control indoor temperatures and keep our homes clean.

This technology is promising, but it's not quite ready for the consumer market yet. The average consumer can't afford a WSN or a smart house, and if he could, there's a good chance he or she wouldn't be able to operate these sophisticated systems. Another issue is security -- until developers find a way to secure these networks, consumers risk sharing medical information and leaving their homes open to attack.

For lots more information about home networks, installation and technology, see the links on the next page.

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ASSESSMENT OF A PORTABLE MAPPING TOOL FOR TIME-CRITICAL

ASSESSMENT OF A PORTABLE MAPPING TOOL FOR TIME-CRITICAL
MANAGEMENT OF DISASTERS

In the field of disaster response, the following paper presents a hand-held mobile mapping tool that can potentially be used to coordinate field operations, to help navigation of rescue teams and to identify priority areas of high vulnerability. The tool is named “Mobile Geoimager” and is a combination of various sensors aimed to collect coordinates, heading, tilts and medium resolution
pictures. The Mobile Geoimager is part of a multi-user framework that incorporates communication technologies between field stations and base station. The tool aims to provide accurate and updated spatial information to field operators and to manage share of field and external information. Its major interest is to combine a set of technologies using low-cost commercial off-the-shelf hardware. In short, it comprises mobile computer system, GPS, magnetic sensors, digital image sensors and wireless communication. On the software side, the system benefits greatly from free Open-Source software, ranging from databases, operating systems to web mapping technology in order to control the flow of information. It is going to incorporate as much as possible standards and to reduce development efforts by using available software libraries. An accurate integration of already available technologies is expected to enhance information exchange during field operation in disaster response phase.

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