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Host discovery is a term I’ll use to describe a certain phase of a penetration test, where one attempts to determine the accessible hosts on a network. Many times if a firewall ruleset is written explicitly, it is difficult to accurately determine the number of hosts that are behind a firewall.
Fortunately, Nmap offers a wide variety of host discovery techniques beyond the standard ICMP echo request. They are described in the following sections. Note that if you specify any of the -P options discussed in this section, they replace the default discovery probes rather than adding to them.
Discover Live Hosts. There are various techniques that can be used to discover live hosts in a network with nmap. Depending on whether you are scanning from the same LAN subnet or outside of a firewall, different live host identifications can be used (we will discuss this later).
Because host discovery needs are so diverse, Nmap offers a wide variety of options for customizing the techniques used. Host discovery is sometimes called ping scan, but it goes well beyond the simple ICMP echo request packets associated with the ubiquitous ping tool.
Use our Nmap cheatsheet for essential commands including host discovery, network and port scanning, and firewall evasion.
5 sie 2024 · Aug 5, 2024. -- In this comprehensive Nmap tutorial, we delve into the art of host discovery and network mapping. Learn how to effectively use Nmap, a powerful open-source network scanning...
"Nmap (Network Mapper) is a free and open source (license) utility for network discovery and security auditing. 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. Nmap uses raw IP packets in novel ways to determine what hosts
