May 2017
Intermediate to advanced
416 pages
21h 33m
English
Content preview from Nmap: Network Exploration and Security Auditing Cookbook - Second Edition
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I recommend that you also run a couple of test scans to measure the speeds of the different DNS servers. I've found that ISPs tend to have the slowest DNS servers, but you can make Nmap use different DNS servers by specifying the argument --dns-servers. For example, to use Google's DNS servers, use the following command:
# nmap -R --dns-servers 8.8.8.8,8.8.4.4 -O scanme.nmap.org
You can test your DNS server speed by comparing the scan times. The following command tells Nmap not to ping or scan the port and only perform a reverse DNS lookup:
$ nmap -R -Pn -sn 74.207.244.221 Nmap scan report for scanme.nmap.org (74.207.244.221) Host is up. Nmap done: 1 IP address (1 host up) scanned in 1.01 seconds
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