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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How it works...
The arguments -sn -PE scanme.nmap.org tell Nmap to send an ICMP echo request packet to the host scanme.nmap.org. We can determine that a host is online if we receive an ICMP echo reply to this probe. By setting the --packet-trace option, we can see easily what happens behind the curtains:
SENT (0.0775s) ICMP 192.168.1.102 > 74.207.244.221 Echo request (type=8/code=0) ttl=56 id=58419 iplen=28 RCVD (0.1671s) ICMP 74.207.244.221 > 192.168.1.102 Echo reply (type=0/code=0) ttl=53 id=24879 iplen=28 Nmap scan report for scanme.nmap.org (74.207.244.221) Host is up (0.090s latency). Nmap done: 1 IP address (1 host up) scanned in 0.23 seconds
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