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Learn to hack part 3

In chapter 1 we have seen a few tricks and oddities in a Microsoft Word system. In chapter 2 we learned a lot about RFCs. In this third chapter, before we fight, we must first know who we are, so know ourselves first before taking action.

Know yourself

"Whoever has deep knowledge of himself and his enemy will eventually win all battles. Whoever knows himself but does not know his enemy has only an equal chance of winning. However, who does not know himself or his enemy, will lost on all battlefields ". Sun tzu - Art of War.

Art of War
Sun-Tzu : Art of War

IP Address

When we use the internet and are connected to a network, our computers can be accessed by other people, each computer or laptop has its own identity called an IP address. There are two IP addresses, namely dynamic and static IP addresses, what we use to connect to the internet is a dynamic IP address that can change in value.

The format for writing the IP Address is A.B.C.D which consists of 8 digits between 0 to 255. For local IP Addrees that are not connected to the internet is which we usually call localhost. When connected to the internet, we will get another IP Address with a value of depending on the provider.

To find out the IP address of our own computer, you can use the Command Prompt by typing ipconfig. Then the computer will display the data we are looking for.

It should also be noted that IP addresses have two types, namely public IP addresses and private IP addresses.

Public IP is the IP used on the internet. Its use must be through registration with an organization that handles this problem. The goal is that there are no two hosts with the same IP. Meanwhile, Private IP is used on local networks and does not require registration.

In conclusion: a private IP is an IP that is used on a network that is not connected to the internet such as a LAN. While Public IP is used for networks connected to the internet, so if when we connect to the internet then we replace this public IP with a private IP then we will not be connected to the internet.

Sample case ; an ordinary cafe has a Public IP to connect to the internet but to connect to other users using a private IP. At the beginning it was explained, when we did the ipconfig command, what appeared was a private IP.

Well! To find out the public IP, there are many sites that can check the public IP in the list below.
MAC Address (Media Access Control Address)

Is a network address implemented at the data link layer in the seven layers of the OSI model, which represents a particular node in the network.

The simple meaning of MAC Address is the physical address of a computer. To find out, we can use the ipconfig / all command.

The descriptions indicate the hardware names used. To prove it, please open the device manager in the control panel. In the network adapter section there is the same hardware name when checked in ipconfig / all. While the MAC Address is in the Physical address section.


To get hostname just type hostname at the command prompt and your computer name will appear. For more details, use the command whoami / all.
Apart from the host name, we will also get other important information such as SID (Security Identifier), group name etc.

SID functions as an identifier of the user account. For example, someone has a KTP with the real name Jeni. However, he could change his name to Juned or Jeng. The real name is still Jeni, this is called SID.

Protocol is a communication standard between computers that has different standards in the implementation of computer networks. Unix, Linux and Sun Solaris platforms use the NFS (Network File Sharing) network, Novell Netware uses the IPX network protocol, while Microsoft Windows uses the NetBIOS (Network Basic Input-Output System) network protocol.

As for network and internet communication protocols that are global in nature, namely TCP / IP (Transmission Control Protocol / Internet Protocol)

The way to find out all the networks connected to your network. We can use the (Network View) tool to find and manage networks. With this tool you can perform automatic searches so you know which computers are connected to your network.

How to use this tool is very easy, you just have to run the program, click on the file menu> New or click the new icon. The Discover dialog box will appear then enter the requested information such as Title etc. In the Address section, enter the IP range that will be searched then click OK. Wait for the search process to complete.

With the help of this tool we can scan ports, ping, FTP, Telnet, VNC etc.

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