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Nmap -PU can't find any host available
From: Anorpi Jia <5262122 () gmail com>
Date: Sat, 29 Mar 2014 10:45:53 +0800

Hi,
I run [nmap -sn -n -PU xxx.xxx.xxx.xxx/24]for host discovery´╝îThe
description of -PU in official Documents:

[Upon hitting a closed port on the target machine, the UDP probe should
elicit an ICMP port unreachable packet in return. This signifies to Nmap
that the machine is up and available.]

Meaning that when the target host returns ICMP unreachable [Type3
Code3].Nmap will report this host is available.
I use wireshark to capture.And wireshark displays many hosts replied ICMP
port unreachable,but the final result is shown by nmap:"Nmap done: 256 IP
addresses (0 hosts up)"´╝îMeaning is no host is available. Selinux and
iptables are disable.

My computer:
Centos 6.5
Nmap 6.40
The Screenshot in attachments

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