NMAP
or the Network Mapper is a tool which has long been used for port scanning and
network mapping. It is a must-have for a lot of security and network
administrators who constantly scan ports to detect potential vulnerabilities.
It is also often employed for attacking systems though. Combined with popular hacking
methods like phishing, keylogging, or cookie stealing, it can target computer
activities whether logging on to emails or social networking sites like
Facebook.
There
are two main reasons why the NMAP has picked up popularity in the industry. First,
it is very easy to use and second, it has a wide range of uses.
Uses
- Scanning
There
are three basic scans that can be performed on ports using the NMAP.
- SYN Scan is the most basic and common
scan used for computer ports. Results may come faster when compared to
others, but these can be really general as well.
- FIN Scan allows for the detection of
weak firewalls and filtered packets. It also warns attackers should they
need to create stealth when attacking victim networks.
- ACK Scan allows for the scanning of both
unfiltered and filtered ports. It is currently rendered the most advanced
scan the NMAP can do.
·
Use of Decoy
When
scanning ports, the NMAP allows the use of decoys to avoid being caught by
system administrators. Decoy IP addresses will be shown in target security logs
instead of the actual IPs of attackers. However, decoy addresses have to be
alive. It is still essential to check target security logs for assurance.
- Reverse DNS Lookup
The
NMAP is able to perform a reverse DNS lookup on a subnet as well. This tool can
produce a listing of available IP addresses along with the related PTR record
of a subnet. Subnets may be entered in a CDIR notation.
Aside
from scanning ports, NMAP is also able to:
- Find
active IP addresses wi
thin networks
- Ping
IP address range
- Find
which IPs are unused on given subnets
- List
servers with open ports
- Get
info on OS detection and remote host ports
NMAP
has constantly been rated 5 stars and is often promoted by compliance, network
and security engineers. The tool can be helpful in training new generation
engineers since it prompt enlightening as well as the collection of valuable
information regarding one’s network. It is a huge contribution to segment
architecture and base lining of networks, highlighting potentially risky
changes and connection information.
But is NMAP for good or
bad?
It
is a very powerful tool and as with others, can be a double-edged sword. The
NMAP can discover open ports but it would still depend on users what they want
to do further, whether exploit vulnerabilities or make networks safer.
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