![]() ![]() The formatting can be customized to print out how you want and you can scan more ports if needed. It’s used in the engagement of penetration testing and is the security auditing in cybersecurity. This is just the basics for building tools like this. Network Mapper (Nmap) is one of the most common and widely used tools for network reconnaissance. That output is a little noisy for my taste, so if we remove some of the print statements like in this example here, we get the following output: IP(dst=host)/TCP(sport=src_port,dport=dst_port,flags="S"),timeout=1, Angry IP Scanner is a cross-platform and, like nmap, is an open-source network scanner created to for fast and efficient deployment. # Send SYN with random Src Port for each Dst port Angry IP Scanner is another classic tool that could (and should be) used in tandem with nmap and other similar tools for hacking and monitoring networks. But, if we get an expected TCP SYN/ACK response, we will send a RST so the host doesn't keep listening for our ACK since we already know the host is listening on that port. ![]() If we get an ICMP unreachable or error response, we also know the host is not willing to take requests on that port. If you are looking for a simple to use and well working port scanning tool for Windows, check out Angry IP Scanner. ![]() If we get no response or a TCP RST in return, we know that the host is filtering or not listening on that port. Using a random TCP source port to help obfuscate the attack (although most firewalls are smarter than this nowadays), we send a TCP SYN packet to each destination TCP port specified. We start out by defining our host and ports to scan and then move on to the fun stuff. This is a fairly basic tool to test whether a host has specific TCP ports open and listening. We will be emulating some nmap & Angry IP Scanner type features and creating the following tools: We've seen a lot of cool applications for scapy in your network tools, but a good inspiration for new tools is to look at existing tools to figure out how they do their job. ![]()
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