How can I forget about NMap. I am so damn ignorant. This is one of the powerful tool used for various scanning process.
Nmap is a free open-source utility for network exploration and security auditing. It is used to discover computers and services on a computer network, thus creating a “map” of the network. Just like many simple port scanners, Nmap is capable of discovering passive services. In addition, Nmap may be able to determine various details about the remote computers. These include operating system, device type, uptime, software product used to run a service, exact version number of that product, presence of some firewall techniques and, on a local area network, even vendor of the remote network card. Nmap runs on Linux, Microsoft Windows etc.
The idle scan is a TCP port scan method that through utility software tools such as Nmap and Hping allows sending spoofed packets to a computer. Idle scans take advantage of predictable Identification field value from IP header. An attacker would first scan for a host with a sequential and predictable sequence number (IPID). The latest versions of Linux, Solaris, and OpenBSD are not suitable targets, since the IPID has been implemented with patches. Computers chosen to be used in this stage are sometimes known as “zombies”. Once a suitable zombie is found the next step would be to send a SYN packet to the target computer, spoofing the IP address from the zombie. If the port of the target computer is open it will respond with a SYN/ACK packet back to the zombie. The zombie computer will then send a RST packet to the target computer because it did not actually send the SYN packet in the first place. Since the zombie had to send the RST packet it will increment its IPID. This is how an attacker would find out if the targets port is open. If the IPID is not incremented then the attacker would know that the particular port is closed.
To perform idle scanning by nmap, the user should find a suitable zombie on the LAN:
nmap -sP 192.168.1.0/24
This tells nmap to do a ping sweep and shows all the hosts that are in a given IP range. Once you have found a zombie, next you should send the spoofed packets:
nmap -P0 -p
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