nmap alwys report "Host seems down."

P

postcd

Guest
Hello, nmap on Linux CentOS always report "Host seems down."

# nmap ianfette.org;nmap ianfette.org -Pn;nmap -sP -vv --packet-trace google.com

Starting Nmap 5.51 ( http://nmap.org ) at 2016-07-13 15:22 EDT
Note: Host seems down. If it is really up, but blocking our ping probes, try -Pn
Nmap done: 1 IP address (0 hosts up) scanned in 0.49 seconds

Starting Nmap 5.51 ( http://nmap.org ) at 2016-07-13 15:22 EDT
Nmap done: 1 IP address (0 hosts up) scanned in 0.50 seconds

Starting Nmap 5.51 ( http://nmap.org ) at 2016-07-13 15:22 EDT
Warning: Hostname google.com resolves to 6 IPs. Using 64.233.185.102.
Initiating ARP Ping Scan at 15:22
Scanning google.com (64.233.185.102) [1 port]
SENT (0.0510s) ARP who-has 64.233.185.102 tell 127.0.0.1
SENT (0.2520s) ARP who-has 64.233.185.102 tell 127.0.0.1
Completed ARP Ping Scan at 15:22, 0.43s elapsed (1 total hosts)
Nmap scan report for google.com (64.233.185.102) [host down]
Other addresses for google.com (not scanned): 64.233.185.113 64.233.185.100 64.233.185.139 64.233.185.138 64.233.185.101
Read data files from: /usr/share/nmap
Note: Host seems down. If it is really up, but blocking our ping probes, try -Pn
Nmap done: 1 IP address (0 hosts up) scanned in 0.47 seconds
Raw packets sent: 2 (56B) | Rcvd: 0 (0B)

# ping ianfette.org -c2
PING ianfette.org (173.201.140.128) 56(84) bytes of data.
64 bytes from p3nlhg53c096.shr.prod.phx3.secureserver.net (173.201.140.128): icmp_seq=1 ttl=54 time=52.7 ms
64 bytes from p3nlhg53c096.shr.prod.phx3.secureserver.net (173.201.140.128): icmp_seq=2 ttl=54 time=52.6 ms

Please which commands should i do to discover cause?
 

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