Membuat VPN dengan MikroTik RB750

Membuat VPN dengan MikroTik RB750

Catatan saya selanjutnya dalam belajar mikrotik adalah tentang  "Cara Membuat VPN dengan MikroTik RB750". Sebelumnya mungkin ada beberapa pembaca blog gaptek ini yang masih belum tau apa itu VPN, dapat membaca sekilas infonya pada postingan saya sebelumnya tentang VPN.

Membuat VPN Server dengan MikroTik RB750

Dalam artikel ini saya akan sharing tentang bagaimana cara membuat VPN Server dengan MikroTik RB750 menggunakan protokol PPTP. Salah satu manfaatnya adalah kita bisa membuat koneksi VPN antara komputer ditempat kerja dengan komputer yang berada di rumah. Berikut gambar topologi jaringan yang saya gunakan:

Karena secara default MikroTik RB750 telah dikonfigurasi sebagai internet gateway, maka disini saya hanya tinggal menambahkan lagi beberapa setingan agar VPN Server dapat kita buat. Berikut adalah langkah-langkah cara membuat VPN Server dengan MikroTik RB750 dengan menggunakan protokol PPTP.

1. Matikan DHCP Client pada interface 0 (ether1-gateway)
   ip dhcp-client disable 0
   
   
2. Berikan IP Address Public pada ether1-gateway
   ip address add address=121.212.12.12/29 interface=ether1-gateway
   
   
3. Tambahkan IP Firewall Filter berikut:
   ip firewall filter add chain=input in-interface=ether1-gateway connection-state=new acction=accept
   
   
4. Buat IP Pool, untuk memberikan IP Address dinamic bagi client yang terhubung secara VPN.
   ip pool add name=vpn-pool ranges=10.10.10.2-10.10.10.5
   
   
5. Buat PPP Profile
   ppp profile add name=vpn-profile local-address=10.10.10.1 remote-address=vpn-pool
   
   
6. Buat PPP Secret
   ppp secret add name=user-vpn01 password=user-password01 service=pptp profile=vpn-profile
   
   
7. Enable PPTP Server
   interface pptp-server server set enable=yes

Membuat VPN Client di Windows XP

Setelah VPN Server di MikroTik RB750 berhasil kita buat, langkah selanjutnya adalah membuat VPN Client di komputer rumah kita. Disini saya akan menguraikan langkah2 membuat VPN Client di komputer yang menggunakan OS Windows XP.

1. Buka Control Panel - klik icon Network Connections
2. Klik Create a new connection - klik Next
3. Pada jendela Network Connection Type, pilih Connect to the network at my workplace - klik Next
4. Pada pilihan Create the following connection, pilih Virtual Private Network connection - klik Next
5. Isi kolom Company Name, misalkan VPNKU - klik Next
6. Pada jendela selanjutnya isikan alamat IP Address public dari MikroTik RB750 yang akan kita hubungi, yaitu 121.212.12.12
7. Klik Next - klik Finish.
8. Untuk mencoba VPN, double klik ikon VPNKU, pada jendela Connect VPNKU  isikan Username= user-vpn01 password= user-password01 seperti yang sudah dibuat sebelumnya.
9. Apabila sudah terhubung akan ada notifikasi "VPNKU is now connected" dipojok kanan bawah monitor. Untuk melihat informasi status jaringan, double klik aja icon tersebut dan kita akan mendapatkan informasi kurang lebih seperti dibawah:
   
   

 Sekarang komputer kita sudah terhubung dengan jaringan LAN yang menggunakan gateway MikroTik RB750, kita dapat melakukan transfer data, ngeprint ke printer sharring, meremote server dan lain sebagainya. Koneksi internet kita pun sudah menggunakan gateway MikroTik RB750, untuk mencobanya lakukan aja dengan perintah tracert google.com dan perhatikan bedanya antara sebelum konek ke VPN dan sesudah konek VPN.

Demikianlah uraian singkat tentang bagimana cara membuat koneksi VPN menggunakan MikroTik RB750 ini semoga ada manfaatnya.

Cara Jailbreak Untethered iOS 6.1.2 Dengan EvasiOn

Evaders (@evad3rs), grup hacker iOS yang terdiri dari @pod2g, @planetbeing, @MuscleNerd dan @pimskeks telah resmi meluncurkan evasi0n, jailbreak untethered untuk iOS 6.
Evasi0n dipastikan dapat bekerja dengan baik untuk semua iDevice yang mendukung iOS 6 hingga 6.1.2, diantaranya:

• iPhone 3GS
• iPhone 4
• iPhone 4S
• iPhone 5
• iPad mini
• iPad 2
• iPad 3
• iPad 4
• iPod touch 4G
• iPod touch 5G

Sebelum jailbreak:

• Pastikan Anda telah melakukan backup dari iTunes ataupun dari iCloud.
• Sebelum menggunakan evasi0n, nonaktifkan passcode pade iDevice Anda terlebih dahulu.
• Saat proses jailbreak berlangsung, harap bersabar, jangan menjalankan iTunes, dan jangan menjalankan program apapun di komputer Anda yang bisa mengganggu proses jailbreak. Lebih baik, jangan menyentuh komputer sama sekali.
• Buat pengguna iPhone 4 (khusus FU) dan iPod touch 4G yang masih menggunakan iOS 6.1 dengan jailbreak tethered, disarankan untuk melakukan fresh restore ke iOS 6.1.2

Perhatian!:

Dengan mengikuti tutorial di bawah ini, berarti Anda tahu Apa yang sedang Anda kerjakan. Resiko kerusakan ditanggung oleh Anda sendiri.

1. Download evasi0n dari http://evasi0n.com/
2. Pastikan Anda memilih yang sesuai dengan sistem operasi yang Anda gunakan.
3. Ekstrak kemudian jalankan evasion dari komputer Anda.
4. Hubungkan iDevice ke komputer Anda, dan tunggu sampai evasi0n berhasil mendeteksinya. iDevice boleh dalam keadaan nyala.
5. Jika berhasil dideteksi, tombol Jailbreak pada evasi0n akan aktif. Silakan tekan tombol Jailbreak tersebut untuk memulai proses jailbreak.

1. Selanjutnya proses jailbreak akan dimulai, ada banyak tahap-tahap yang dilalui dan semuanya otomatis dikerjakan oleh evasi0n.
2. Setelah proses awal tersebut selesai, evasi0n akan berhenti sejenak untuk meminta Anda membuka kunci layar pada iDevice.

1. Setelah Anda membuka kunci layar dan masuk ke homescreen, akan muncul sebuah ikon putih berlogo evad3rs. Tap ikon yang bernama “Jailbreak” tersebut satu kali untuk melanjutkan proses jailbreak. Pastikan hanya men-tap ikon ini sekali saja, bukan berkali-kali.

1. Kemudian proses jailbreak evasi0n akan berlanjut di komputer Anda dengan beberapa tahap final. Harap bersabar.
2. Jika proses jailbreak berjalan lancar, evasi0n akan menampilkan pesan “Done!”.
3. iDevice Anda secara otomatis akan melakukan reboot, proses ini mungkin sedikit agak lama.

1. Kemudian pada layar iDevice Anda akan muncul logo evasi0n dengan background putih, diikuti dengan rebootnya iDevice Anda untuk menyelesaikan proses jailbreak.
2. Setelah iDevice Anda reboot beberapa kali secara otomatis, Anda sudah bisa masuk ke homescreen dan membuka Cydia.

Selamat! iDevice Anda telah berhasil dijailbreak.

Troubleshooting

• Walaupun sebelum dirilis secara resmi ke publik evasi0n telah melalui beberapa tahap uji coba, tetapi beberapa masalah bisa saja terjadi. Berikut ini adalah beberapa masalah yang mungkin saja terjadi pada saat atau setelah melakukan proses jailbreak.
• Patching kernel ini adalah salah satu tahap dalam proses jailbreak. Tahap ini memang cukup memakan waktu sampai beberapa menit, namun jika Anda merasa tahap patching kernel ini sudah terlalu lama, Anda bisa melakukan reboot paksa dengan menekan sambil tahan tombol Home dan Power secara bersamaan sampai iDevice Anda reboot, kemudian mengulangi proses jailbreak.
• Dikarenakan padatnya trafik Cydia, maka beberapa repositori mungkin akan menampilkan pesan error sewaktu Anda akan menginstall apps/tweaks. Ini wajar dan sudah sering terjadi setiap kali sebuah jailbreak dirilis. Anda cukup bersabar hingga trafik ke Cydia mulai menurun.
• Tombol Jailbreak pada evasi0n berwarna abu-abu/tidak bisa diklik
  Jika Anda mengalami masalah ini, pastikan kalau iDevice Anda tidak terlindungi dengan passcode. Matikan passcode terlebih dahulu sebelum menghubungkan iDevice Anda ke komputer. Setelah proses jailbreak selesai, Anda boleh mengaktifkan passcode kembali.
• Setelah proses jailbreak selesai, Anda mungkin akan melihat beberapa ikon aplikasi tambahan yang muncul di homescreen. Ini wajar. Abaikan saja aplikasi ini, atau Anda bisa menyembunyikannya kembali dengan bantuan SBSettings dari Cydia.

Good luck!

How to shrink partition in Windows 7 and Vista

Windows 7 and Vista include a built-in functionality in Disk Management to shrink and expand partitions. No more 3rd party utilities needed!
To get to this utility, open up Control Panel, and type in partition into the search box.. you’ll immediately see the link show up:

Shrink a Partition
In the Disk Management screen, just right-click on the partition that you want to shrink, and select “Shrink Volume” from the menu.

In the Shrink dialog, you will want to enter the amount you want to shrink by, not the new size. For example, if you want to shrink your 50gb partition by roughly 10gb so that it will now be roughly 40gb, enter 10000 into the box:

Extend a Partition
In the Disk Management screen, just right-click on the partition that you want to shrink, and select “Extend Volume” from the menu.

On this screen, you can specify the amount that you want to increase the partition by. In this case, I’m going to extend it back to the roughly 50GB size that it was before.
Note that the extend partition feature only works with contiguous space.

Load Balancing over Multiple Gateways

The typical situation where you got one router and want to connect to two ISPs:

Of course, you want to do load balancing! There are several ways how to do it. Depending on the particular situation, you may find one best suited for you.

Policy Routing based on Client IP Address

If you have a number of hosts, you may group them by IP addresses. Then, depending on the source IP address, send the traffic out through Gateway #1 or #2. This is not really the best approach, giving you perfect load balancing, but it's easy to implement, and gives you some control too.
Let us assume we use for our workstations IP addresses from network 192.168.100.0/24. The IP addresses are assigned as follows:

• 192.168.100.1-127 are used for Group A workstations
• 192.168.100.128-253 are used for Group B workstations
• 192.168.100.254 is used for the router.

All workstations have IP configuration with the IP address from the relevant group, they all have network mask 255.255.255.0, and 192.168.100.254 is the default gateway for them. We will talk about DNS servers later.
Now, when we have workstations divided into groups, we can refer to them using subnet addressing:

• Group A is 192.168.100.0/25, i.e., addresses 192.168.100.0-127
• Group B is 192.168.100.128/25, i.e., addresses 192.168.100.128-255

If you do not understand this, take the TCP/IP Basics course,
or, look for some resources about subnetting on the Internet!

We need to add two IP Firewall Mangle rules to mark the packets originated from Group A or Group B workstations.
For Group A, specify

• Chain prerouting and Src. Address 192.168.100.0/25
• Action mark routing and New Routing Mark GroupA.

It is a good practice to add a comment as well. Your mangle rules might be interesting for someone else and for yourself as well after some time.
For Group B, specify

• Chain prerouting and Src. Address 192.168.100.128/25
• Action mark routing and New Routing Mark GroupB

All IP traffic coming from workstations is marked with the routing marks GroupA or GroupB. We can use these marks in the routing table.
Next, we should specify two default routes (destination 0.0.0.0/0) with appropriate routing marks and gateways:

This thing is not going to work, unless you do masquerading for your LAN! The simplest way to do it is by adding one NAT rule for Src. Address 192.168.100.0/24 and Action masquerade:

Test the setup by tracing the route to some IP address on the Internet!
From a workstation of Group A, it should go like this:

C:\>tracert -d 8.8.8.8

Tracing route to 8.8.8.8 over a maximum of 30 hops

  1     2 ms     2 ms     2 ms  192.168.100.254
  2    10 ms     4 ms     3 ms  10.1.0.1
  ...

From a workstation of Group B, it should go like this:

C:\>tracert -d 8.8.8.8

Tracing route to 8.8.8.8 over a maximum of 30 hops

  1     2 ms     2 ms     2 ms  192.168.100.254
  2    10 ms     4 ms     3 ms  10.5.8.1
  ...

You can specify the DNS server for workstations quite freely, just make it can be reached (test it by tracing the route to DNS server's IP address)!

Fort Rotterdam Makassar

The Fort Rotterdam is the fortress known as "ujung pandang" the tip of view, is a relic of the glory and might of the history of the kingdom of Gowa in the 17th century. This fortress was built in 1545 by the king of Gowa IX. he is known as i marigau Karaeng Bonto daeng lakiung, known as the turipallangga Karaeng ulaweng. 

in its heyday the fort was a stronghold of the kingdom of Gowa. then taken over by the Dutch government and the Japanese rule. oelh independence after the government of Indonesia used as a place of asylum and archaeological heritage, cultural centers and museums La Galigo.

fort rotterdam is located in the city center along the coastal strip makassar Losari. can be done with a variety of vehicles and public transport. This fort near the shopping center there Somba Opu road, which provides many craft items typical sulawesi. These location are also many hotels, cafes, travel agency.

BIRA BEACH SOUTH SULAWESI

 

Bira Beach lies at the south-eastern tip of South Sulawesi. Coming from Makassar the 190 kilometers going there will take about four hours by car. Tanjung Bira and surroundings are famous for their white beaches with powder-like sand and shipbuilding. Tourism is slowly developing in this area, resulting in better access to the villages and some reasonable quality places to stay. Bira is suitable for relaxing on the beach, swimming, snorkeling, diving and walks in the area. Please be aware of the very strong currents around cape Bira.

 

The rainfall pattern in Bira (and as well Bulukumba and Sinjai) is different from Makassar and many other areas in Sulawesi, Bali and Java. While Makassar has heavy rains in the period December - February, Bira and surroundings are dry, though an occasional shower from the west will be possible. In Bira most rain falls during the months April, May and June.

 

The most visited part of the peninsula is around the very end of the tar road. This area is called Kapongkolang. Unfortunately this place has in the past been cleared of trees before the building of restaurants and small hotels started. Because of the dry limestone soil, trees only slowly come back again. It takes just a short walk from here to visit greener beaches in the area.

 

Bira's harbour you will find at the south-east side of the peninsula. This is the place from where the ferries to Selayar and Labuan Bajo (Flores) leave. During the west monsoon many classical style boats that usually are operated for dive cruises moor here for shelter and repairs.

 

Pulau Kambing, Pasi Tanete and Selayar

South of the Bira peninsula lies the 80 km long, long-stretched island of Selayar. The 16 km wide strait between Bira and Selayar is well know for its attractive diving spots. The most popular dive locations here are around the islands "Pulau Kambing" and "Pasi Tanete". It is strongly advised to be accompanied by a dive guide that knows this area well, as currents can be dangerous. 

 

 

 

TANAH BERU

On the road from Bulukumba to Tanjung Bira you will pass after about 25 km Tanah Beru, a village full of boat builders. In the past many boat builders from around Bira moved here, resulting in an interesting concentration of boats under construction. If you are in the village, just go off the main road at the point it makes a sharp curve, and spend some time to visit the building sites. 

Most boats are of the type "Finisi" (Pinisiq). Many of these boats still are built without the use of technical drawings. Still many wood connections are made with wooden pins. Recently the price of boats built here went up drastically due increasing hardwood prices. This did not stop new boats being built. A big part of the boats under construction are ordered by foreigners that operate these "pinisiq" for dive cruises.

 

TORAJA TOUR, SOUTH SULAWESI

Welcome to the Tana Toraja, the "Land of Heavenly Kings".

The long drive from the lowlands to the mountain stronghold of Tanaopens up a breath-taking new world. The rugged mountains and verdant valleys are home to a people whose love of religious spectacle is equaled only by their hospitality. With majestic panoramas, captivating villages and dramatic ceremonies, Tana Toraja is the undisputed highlight of any journey to Sulawesi.
Upgraded roads, an airport and several star-rated hotels have opened the Toraja highland to visitors of all interests. The essence of the Toraja beliefs and way of life can be experienced without undue effort, as many interesting sites are clustered around the town of Rantepao, easily accessible by road...

Toraja Land whose ancestor oriented group believes that their forefathers descended from heaven onto a mountain some twenty generations ago. Their colourful culture is especially rich in elaborate sacrificial, post mortuary, and cave burial sites.
Tana Toraja (Toraja Land), which lies in the north of the province is known for its unique culture and ancient traditions. The center of tourism is Rantepao, 328 km from Ujung Pandang by road. There are several small bungalow hotels at Rantepao, and Makale, the district capital. The entry to Tana Toraja is marked by a gate built in traditional boat-shaped architecture. The road passes through the mountains of Kandora and Gandang on which, according to Toraja mythology, the first ancestors of celestial beings descended from heaven. The majority of the people still follows an ancestral cult called "Aluk Todolo" which governs all traditional ceremonies. From Rantepao, side trips can be made to Kete, a traditional village where there are handicraft and unique shops. Behind the village there is a grave site on a hillside. Life-size statues guard over old coffins. As roads are not always paved, it is necessary to use a jeep or walk if the weather is good (between May and October).
Two cliff graves easy to reach are Lemo and Londa. Londa is one of the oldest hanging graves belonging to the nobility. A large balcony is filled with effigies of the dead. Kerosene lamps with young village guides, can be hired to enter the caves to see skeletons and old coffins. At Lemo, burial chambers are cut out of the rock and several balconies filled with effigies look out while new caves are being dug to serve as family graves.
There are several grave sites and traditional villages of which Palawa is a classic example of a village on a small hill with "Tongkonan" or a burial place with celebrations and festivals. Visitors are welcome but they are expected to adhere to local customs of dress, seating and bringing a token present.

TOUR BANTIMURUNG BUTTERFLY

In 1857, leading British naturalist, Alfred Russell Wallace discovered wonders beyond his imagination as he travelled into the interior of South Sulawesi, Indonesia. He found himself surrounded by thousands of enchanting butterflies of various sizes and colors.  Fascinated by the scene, he dubbed the area “the Kingdom of Butterflies” and later spent most of his life in this region to enjoy and examine the 150 species of butterflies not found elsewhere. Today the area is known as the Bantimurung Bulusaraung National Park, which is not only the scene of butterflies but also of magnificent caves and a stunning waterfall.

Located in the Maros regency in the province of South Sulawesi, the Bantimurung Bulusaraung National Park is a mere 50Km from Makassar or 20Km from the Sultan Hasanuddin international airport.

The Bantimurung National Park has a total area of approximately 43,750 hectares and is divided into three major types of ecosystems, namely the karst ecosystems, a lowland forest ecosystem, and a lower montane forest ecosystem.  The valleys of limestone hills and steep karts walls with tropical vegetation have made Bantimurung an ideal habitat for various rare and endemic species of butterflies, birds and insects.

Although there are not as many butterflies today as there were during Wallace’s expedition, visitors can still observe the wide variety of butterflidx within the Butterfly Conservation Captivity managed by the Center for Butterfly Breeding. Among various species of butterflies found here are: the Troides halipron, Papiliio Pofites, Papiliio Satapses, Papiliio blumei and Graphium androcles. One of the rarest and biggest butterflies of the world, the papillo androcoles are also found in this National Park. This unique species has the tail similar to swallows. Within the national park, visitors can also find a butterfly museum which houses thousands of unique and rare butterflies that have and still inhabit the area. Among other fauna found in the area are: the Kuskus (Phalanger celebencis), Tarsiers (Tarsius sp.), Monkeys (Macaca Maura), hornbills (Ryticeros cassidix, Peneloppides exahartus), and Weasels (Macrogofidia mussenbraecki).

By the butterfly center, the fascinating Bantimurung waterfall draws visitors with its powerful rush of water and refreshing atmosphere. This is a favorite holiday destinaton especially on weekends.

The word Bantimurung itself is derived from two Bugis words: Benti meaning water, and Merrung meaning roaring. Therefore meaning roaring waters. Others also suggest that the name Bantimurung comes from the words Banting Murung or smashing one’s gloom, meaning that here visitors can release their sadness or depressing thoughts through  refreshing nature.

With a height of 15 meters and a 20 meters width, the Bantimurung waterfall can only be described as one of nature’s finest artwork, where waters rush down through its multi levels rocky streams, decorated by colorful surroundings.

The hills of Bantimurung-Bulusaurung National Park also hold wonders in some of its astonishing caves. The most notable of these caves are the Goa Mimpi (dream caves) and Goa Batu (the Stone Cave). Inside these caves, visitors can marvel through their interiors filled with fascinating stalactites and stalagmites. The dreamlike crystal clear stalactites and stalagmites earned the cave its popular name, the dream cave or Goa Mimpi. Among these caves are found prehistoric “hand stencils”, similar to the rock art of Australia.

Hiking through 10 meters ascending stairs, visitors can discover another amazing cave, the Stone cave, or Gua Batu. Aside from offering hiking challenges, Goa Batu also present enchanting sceneries of small waterfall, and a 30 meters long intriguing cave.