![]() Even segmented /22 networks can take hours to scan and that’s not realistic for everyday security scanning. Timing values in the 0- 2 range are less likely to set off network IDS alarms they also take a long time to run, especially if the network is large. The levels range from 0 to 5 (see Table 1). The –T4 parameter is a timing template, and 4 is the level (aggressive). In the Command field, you see nmap –T4 –A –v. While that Intense scan runs, let’s take a closer look at it. It will take a few minutes for the scan to complete. ![]() ![]() For an initial test, select an IP address or a hostname on your network, enter it into the Target field, and click Scan. The target can be a single host, a network, or a web address. You only have to supply a target for the scan. Zenmap’s default scan setting is Intense Scan, and the command-line equivalent of that command is shown in the Command field.
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