Calculating NRT using Nmap
Network Response Time (NRT) serves as a pivotal metric for evaluating network performance, as it directly reflects the efficiency of communication within a network. In this pursuit, Nmap, a versatile and renowned network scanning tool, offers an array of scanning options tailored to efficiently measure NRT. In this exploration, we delve into the mechanics of calculating NRT using Nmap and elucidate the command syntax, supplemented by a practical example. With NRT being a vital indicator of network responsiveness, our examination aims to provide comprehensive insights into harnessing Nmap’s capabilities for gauging this essential performance parameter.
Nmap Scanning Options for NRT Measurement
Nmap offers several scanning options, such as TCP SYN Scan, TCP Connect Scan, and UDP Forward Scan, to measure NRT. For our purpose, we’ll focus on the TCP SYN Stealth Scan, commonly known as the SYN Scan.
Command Syntax:
nmap -[advanced commands] IP
Command Example:
sudo nmap -sS -Pn -n -p80 -d3 www.w3wiki.com
-sS
: Specifies a SYN Stealth Scan, a type of port scan where only SYN packets are sent to the target.-Pn
: Disables host discovery, treating all provided IP addresses as “up.”-n
: Disables DNS resolution, preventing Nmap from attempting to resolve IP addresses to hostnames.-p80
: Specifies scanning only port 80 (HTTP).-d3
: Enables debugging output level 3, which provides detailed information about the scan process.
In this example, we perform a SYN Stealth Scan on port 80 of the website “www.w3wiki.com.” The output will display detailed information about the scan process, timing, and response time.
Understanding the Output:
- The output will show the target host’s IP address, along with port 80 (HTTP) being open.
- You will also see timing statistics, including values like
srtt
(smoothed round-trip time) andrttvar
(round-trip time variation). These values help estimate the network response time.
Network response time can be approximated using the srtt
value, indicating the smoothed round-trip time. Keep in mind that NRT calculation involves multiple factors, and the provided values offer insights into the responsiveness of the network. By using Nmap’s scanning options and analyzing the output, you can effectively measure network response time and gather valuable information for network performance assessment.
Here, we get the final time for host srtt – 5416. This means approximately RTT is 5.416ms. We also get the Timing report along with this.
We have got the results of our scan on the target URL “www.w3wiki.org”
Using Nmap to Calculate Network Response Time
Nmap stands for Network Mapper. It is a tool, primarily used for Port scanning, to check vulnerabilities, and of course, the main purpose – Network Mapping. Most popular Linux distributions give you full root access to their distribution by default but it’s easy to configure otherwise; only remember to always add Nmap as an interactive shell before your machine starts up (not just nmap ). You should never try this at home without doing some research first! Once installed simply run: sudo apt-get install nmap. This will perform various checks which usually means that there are no existing security issues in /etc/rc.local or all files listed below have been reviewed via scans performed manually prior launch process being known about.
Contact Us