Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Tip 3 If you only care about the most popular services (which is sufficient for this lab), you can use the -top-ports=N argument to only scan the N most popular service ports.Nmap is a free and open source utility for network discovery and security auditing. Given that the target is a VM on the same computer (even better than on the same local area network!), shorter timeouts should be perfectly safe. However, you can make Nmap go faster by specifying a non-default Timing Template. Tip 2 If you accept the default options, this scan will take a very long time. Thus, you will have much more accurate results (and be able to fully answer the lab question) if you also enable service and version scanning with your UDP scan. Tip 1: Unlike TCP, there is no generic way to see if a UDP port is open or not, since UDP is connectionless. Perform a Nmap UDP port scan on the Metasploitable2 VM to detect active services. How many ports did Nmap report as closed?.How many ports did Nmap report as open?.What specific ports and services does Nmap find as open? Copy and paste in the entire PORT | STATE | SERVICE table.Either a connect scan ( -sT) or a SYN scan ( -sS) is fine. Perform a Nmap TCP port scan on the Metasploitable2 VM to detect active services. Nmap sent, and a few packets later the target host sent In a short paragraph, explain what replies are received as a result of the Nmap host discovery.(Tip: You can type this hostname into your web browser and see a web page that should immediately confirm the correctness of your answer.) Not to give away part of the answer to a question above, but what is the response hostname to the reverse DNS query Nmap sent for 8.8.8.8.in-addr.arpa? You can obtain this information from the Wireshark trace you just obtained.To document your answer, run Wireshark in the background and capture just the Nmap network scan with the -sn option, with no (or minimal) extra background network traffic.What methods did Nmap use to perform host discovery when run as the root user (i.e.What command did you enter to run the scan as the root user?.When a privileged user tries to scan targets on a local ethernet network, ARP requests are used unless -send-ip was specified." - ĭeliverables (Host discovery of 8.8.8.8): When executed by an unprivileged user, only SYN packets are sent (using a connect call) to ports 80 and 443 on the target. Note: Using sudo so that Nmap can generate arbitrary network packets for this scanįrom the Nmap documentation: "The default host discovery done with -sn consists of an ICMP echo request, TCP SYN to port 443, TCP ACK to port 80, and an ICMP timestamp request by default. Normally this would be used to scan an entire subnet (or larger), but for this lab, we're going to target specific IPs of interest.įirst, target just the Metasploitable2 VM by its IP address. Perform a basic nmap host discovery scan without port scanning. Shut down your VMs, complete the setup, and then return to continue the lab. Warning: If both systems have the same IP address here and you are running VirtualBox, then it is 99% likely that you did not complete the "Networking Configuration" part of the Virtual Machine setup tutorial.
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