Chasing two rabbit, could u ?

Ya, " mengejar dua kelinci dalam waktu yang bersamaan, bisakah anda ? "

Where am I ?

Kerja = 10 jam , 7 hari seminggu kadang lebih, ngga' pernah kurang
termasuk hari raya, beuhhh all become black day ....
Kuliah = 4 jam
Belajar = 6 jam
Tidur = 4 jam, ngga' pernah lebih
Profesi saat ini = Graphic designer
Profesi impian = Network engineer
Pengalaman kerja network engineer = 0


is it another rats in a part of my life !

hhhh... bertanya pada diri sendiri, sebenarnya saya sedang mengejar apa ? apa yang saya cari dari semua ini ? apakah ini yang dinamakan dengan " on the big hope there's a big responsibility " cieee ...

dan terus apa hubungannya dengan rabbit ? hehehe...

ya ibaratkanlah sedang mengejar dua kelinci: (sambil makan kacang)

1. Kerja (buat bayar kuliah) -> Rabbit 1
2. Kuliah (buat mewujudkan cita-cita) -> Rabbit 2

kira-kira bisa ngga' ngedapetin dua-duanya bro ... ? hehe.. sungguh pertanyaan yg menantang ...



kapan saya bisa menjadi " real network engineer " ? kerja di balik console ? bekerja dibalik wall mainframe, travel dari suatu tempat ketempat lain ... installasi project fiber optic kayak mas-mas itu ...

hhhhhh... apakah saya harus menyerah dan menjadi laskar yang hilang ?

duh serasa jadi Lintang ? hehehe ..

sampe kapan saya bertahan ! tapi klo saya berhenti ... ? pilihannya tentu menjadi semakin ruwet?

" Kuliah kamu gimana nak ?
Kreditan motor ? siapa yang bayar ?
Arisan,inilah itulah ... "

Sedangkan umur sudah 23 ? kapan lagi cr portfolio ? resume networking nya ? yang ada malah diketawain sama my dream telco company ( Kamu pengalaman ngga' ada, yang ada malah kerja jadi graphic design, wah kamu salah jalan nak ..." tapi pak ... design itu sekedar hobi saya, iseng .. iseng berhadiah ... oalaa kayak lotere nak hehe.. mo lanjut kuliah ngga' ada duit ... eh ngga' taunya diterima di TV Lokal, yaaa... hhhhhh .... tell me what should I must to do!

ngga' mungkin donk kita lepasin ... kita bicara relatifitas ... bukan gambling !

padahal klo mau diturutin kuliah masih 2 tahun lagi ... Network Engineer ? mungkinkah !!!??

begitu banyak pertanyaan2 yang timbul dalam masa-masa kegelapan ini ( it's the dark time harry .. you should don't speak name ") hehehe ... bro seandainya ada Hegrid yang menemani atau paling tidak Hermoine yang bikin hari-hari ku lebih berwarna ... duh .. mode on : alone in the dark hehehe....

but yang jelas, mungkin saya harus tetap bertahan yah , saya harus fokus, jalani sebaik dan sebisa mungkin, itu yang penting .... sisanya do'a bro ... yakinlah bahwa niatmu itu benar ...

hhhh... semoga MDGS 2010 menjadi nyata !!! amin....

" Life is about choice ... ! not enough .. "

"dengan segala kebimbangan dan kegalauan mencoba menuangkan apa adanya"
tulisan yang aneh .. hehehe ..... :p

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Konfigurasi DHCP Server on RedHat machine

DHCP (Dynamic Host Configuration Protocol) adalah protokol yang berbasis arsitektur client/server yang dipakai untuk memudahkan pengalokasian alamat IP dalam satu jaringan. Sebuah jaringan lokal yang tidak menggunakan DHCP harus memberikan alamat IP kepada semua komputer secara manual. Jika DHCP dipasang di jaringan lokal, maka semua komputer yang tersambung di jaringan akan mendapatkan alamat IP secara otomatis dari server DHCP. Selain alamat IP, banyak parameter jaringan yang dapat diberikan oleh DHCP, seperti default gateway dan DNS server.

DHCP didefinisikan dalam RFC 2131 dan RFC 2132 yang dipublikasikan oleh Internet Engineering Task Force. DHCP merupakan ekstensi dari protokol Bootstrap Protocol (BOOTP).

DHCP Client akan mencoba untuk mendapatkan "penyewaan" alamat IP dari sebuah DHCP server dalam proses empat langkah berikut:

DHCPDISCOVER: DHCP client akan menyebarkan request secara broadcast untuk mencari DHCP Server yang aktif.

DHCPOFFER: Setelah DHCP Server mendengar broadcast dari DHCP Client, DHCP server kemudian menawarkan sebuah alamat kepada DHCP client.

DHCPREQUEST: Client meminta DCHP server untuk menyewakan alamat IP dari salah satu alamat yang tersedia dalam DHCP Pool pada DHCP Server yang bersangkutan.

DHCPACK: DHCP server akan merespons permintaan dari klien dengan mengirimkan paket acknowledgment. Kemudian, DHCP Server akan menetapkan sebuah alamat (dan konfigurasi TCP/IP lainnya) kepada klien, dan memperbarui basis data database miliknya. Klien selanjutnya akan memulai proses binding dengan tumpukan protokol TCP/IP dan karena telah memiliki alamat IP, klien pun dapat memulai komunikasi jaringan.

(courtesy of : http://wikipedia.org)

Berikut konfigurasi DHCP Server yang saya dokumentasikan dengan Server berbasis RedHat dan Client Windows.

----------------------------------------------------------------------------------

1. Cek Paket DHCP

# rpm –qa grep dhcp




2. Jika sudah terinstall, maka masuklah ke direktori /etc dan carilah file dhcpd.conf, namun jika belum terinstall paketnya, maka anda perlu mendownloadnya disini dan menginstalnya terlebih dahulu, dan setelah itu copy dhcpd.conf yg ada di :

# cp /usr/share/doc/dhcp-3.0.5/dhcpd.conf.sample /etc/dhcpd.conf

(perintah ini untuk meng-copy file dhcpd.conf.sample ke /etc/dhcpd.conf )

Tetapi, Jika sudah ada, langsung saja masuk ke direktori /etc dan carilah file dhcpd.conf:

# cd /etc
# ls dchpd*

3. Kemudian konfigurasi file dhcpd.conf

# nano dhcpd.conf

4. lalu pada file dhcpd.conf masukkan network id dan netmask subnetting jaringan anda
(pada project kali ini saya memasukkan net id : 202.100.10.0/28 (255.255.255.240)

5. masukkan juga IP default gateway pada options router dan option subnetmask ;
(pada project kali ini saya memasukkan IP gateway : 202.100.10.1/28 (255.255.255.240)

6. masukkan option domain name dan option domain-name-servers
(pada project kali ini saya memasukkan IP option domain-name-servers: 192.168.0.1 /28 (255.255.255.240) dan option domain name : mdgs-server.co.id

7.masukkan range dynamic boot-p (Jangkauan IP yang disewakan untuk DHCP Client )
(pada project kali ini saya memasukkan range dynamic boot-p dari 202.100.10.10/28 - 202.100.10.15/28)

8. Anda juga bisa menset default lease time (Lama waktu penyewaan DHCP service kepada client)
(pada project kali ini saya memasukkan default lease time selama 21600;) atau per 6 jam DHCP akan mereset otomatis dan mendistribusikan ulang lagi servisnya.





9. Restart service dhcp

# service dhcpd restart

10. Untuk mengetest apakah dhcp server telah berjalan atau belum, maka cobalah masuk ke Network Connection -> Local Area Connection dan pilih Obtain an IP Address Manually pilih OK dan Klik Kanan Repair Local Area Connection.

dan apabila berhasil akan terlihat output tampilan seperti ini (klik kanan -> status):


11. client slide (windows platform):





Output yang terlihat menunjukkan bahwa lease time (waktu penyewaan) sebesar 21600 second; atau sekitar 6 jam (dari pukul 22.29.50 – 04.29.50)





by : Zaid Amin

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Broadcast

Yesterday on Nov 19 2008, I have been completed Phase II and through to Phase III of the Netspace competition, sincerely in the beginning of the competition I wonder and sometimes think to stop, why bro, why ? is this about your daily or what !? come on, you are in 40%...

in the other, my spirit and my commitment fully push me under the limit... I'm not sure I'm indeed.. hehehe...

but, I believe bro I can pass it... so what's the point ?

40 % really ? of the region in Asia Pacific ... " they said that " ...

hhhh ... boring to "broadcast" ...

where are you my queen ? &%#*^%#* ;p

------------------------------------------------------------------------------------------------

Dear NetSpace Skills Pursuit Competitor,

We had some issues with the launch of Phase III that have now been resolved. If you logged on to the NetSpace Skills Pursuit in the past 24 hours to see if you made it to Phase III on the competition Skills track, it would have said that you were in Open Play. We apologize for any inconvenience.

Congratulations! You are in the top 40% for your region and have qualified to continue on the Skills track on Phase III. You are still in the running for one of the prize packages. Phase III is open until December 3, 2009. The top 1,000 competitors at the end of Phase III will continue onto Phase IV on the competition Skills track which opens on December 4, 2008 and closes December 18, 2008. The top 10 scores on each leader board at the end of Phase IV will win a prize package. Winners will be announced on January 8, 2009 as we need to verify that all winners are actual Networking Academy students or alumni.

If you ever have issues with the NetSpace site, please send an email to NetSpace@external.cisco.com.

Good luck with the NetSpace Skills Pursuit competition!

Best regards,

Tracy Granlund

Student Advocacy Team

Cisco Networking Academy

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BINARY (HELL!)

Abbreviations like Kb, KB, Mb and GB are often confused, misunderstood or used incorrectly. Here's a brief explanation of proper usage.

Let's start at the beginning. The only data that a computer can understand is on (1) and off (1). But those two simple commands can be grouped into millions of combinations and it is the way they are grouped in series that creates complex data.

The basic unit is called a bit (binary digit). Each bit has an electronic switch, or gate. If the gate is open the bit is on and electricity can go through. The computer reads on or open switches as a number 1. If the gate is closed or off, the electricity is blocked and the computer reads off bits as 0.

Bits can be grouped together to allow more complex code. Eight bits are grouped together to form a byte. This allows 256 possible combinations of 1/0. The abbreviation for bit is a lowercase "b"; the abbreviation for byte is an uppercase "B". Bits and bytes can then be expressed in larger measurements. They are generally expressed in exponents of two, known as binary code

The Standards

Although computer data is normally measured in binary code, the prefixes for the multiples are based on the metric system. The nearest binary number to 1,000 is 2^10 or 1,024; thus 1,024 bytes was named a Kilobyte. So, although a metric "kilo" equals 1,000 (e.g. one kilogram = 1,000 grams), a binary "Kilo" equals 1,024 (e.g. one Kilobyte = 1,024 bytes). Not surprisingly, this has led to a great deal of confusion.

In December 1998, the International Electrotechnical Commission (IEC) approved a new IEC International Standard. Instead of using the metric prefixes for multiples in binary code, the new IEC standard invented specific prefixes for binary multiples made up of only the first two letters of the metric prefixes and adding the first two letters of the word "binary". Thus, for instance, instead of Kilobyte (KB) or Gigabyte (GB), the new terms would be kibibyte (KiB) or gibibyte (GiB).

Sometimes in the routine life, just a few abbreviations involved with our activity, it's like about bits,B ytes, KBytes and the end GBytes, it's not underestimated fact, if we far from ZByte and up.

In other case, when question comes during on my study, which that Subnetting or in Network design activity, record data stream capture or any field's are involve the abbreviations meter, sincerely I've been stack or confused, little forget exactly, ;) which one that's correctly to calculate the metric.

but, come on !! soon you will be graduate man, how could you answer if your knowledge about abbreviations and the role of it 's none, where's your basically
By the way, here are brief summaries of the Old Standard and the IEC Standard:

IEC Standard 1 bit (bit) = 0 or 1 = one binary digit

1 Octet = Always 8 bits
1 kilobit (kbit) = 10^3 bits = 1,000 bits

1 megabit (Mbit) = 10^6 bits = 1,000,000 bits

1 gigabit (Gbit) = 10^9 bits = 1,000,000,000 bits

1 terabit (Tbit) = 10^12 bits = 1,000,000,000,000 bits

1 petabit (Pbit) = 10^15 bits = 1,000,000,000,000,000 bits

1 exabit (Ebit) = 10^18 bits = 1,000,000,000,000,000,000 bits

1 zettabit (Zbit) = 10^21 bits = 1,000,000,000,000,000,000,000 bits

1 yottabit (Ybit) = 10^24 bits = 1,000,000,000,000,000,000,000,000 bits

Binary to Decimal Conversion to Decimal Conversion
Converting binary to decimal examples:

128 64 32 16 8 4 2 1: Bit values
0 0 0 0 0 0 0 0 = 0
1 1 1 1 1 1 1 1 = 255
0 0 0 0 1 1 1 1 = 15
0 1 0 1 0 1 0 1 = 85
1 0 0 0 0 0 1 1 = 131
0 0 0 1 0 1 1 0 = 22

Binary (Cont.) (Cont.)
Bits Binary Decimal

0 00000000 0
1 10000000 128
2 11000000 192
3 11100000 224
4 11110000 240
5 11111000 248
6 11111100 252
7 11111110 254
8 11111111 255

Math to Memorize! to Memorize!
Subnet mask First Subnet'

256-192 =64
256-224 =32
256-240 =16
256-248 =8
256-252 =4

Powers of 2 Powers of 2

2^1=2
2^2=4
2^3=8
2^4=16
2^5=32
2^6=64
2^7=128
2^8=256

Courtesy of : Globalnet Training Inc. - CCNA/DA Copyright 2002/2003

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