[ntp:questions] Need help on NTP client

Gao gao at pztop.com
Mon Jul 27 18:07:30 UTC 2015


 From my local ntpd server(ovpn.sjv.lan/192.168.123.46):


[root at ovpn ~]# getenforce
Disabled
[root at ovpn ~]# nmap -sU -p U:123 -v 192.168.123.22

Starting Nmap 5.51 ( http://nmap.org ) at 2015-07-27 11:03 PDT
Initiating ARP Ping Scan at 11:03
Scanning 192.168.123.22 [1 port]
Completed ARP Ping Scan at 11:03, 0.02s elapsed (1 total hosts)
Initiating Parallel DNS resolution of 1 host. at 11:03
Completed Parallel DNS resolution of 1 host. at 11:03, 0.00s elapsed
Initiating UDP Scan at 11:03
Scanning 192.168.123.22 [1 port]
Discovered open port 123/udp on 192.168.123.22
Completed UDP Scan at 11:03, 0.02s elapsed (1 total ports)
Nmap scan report for 192.168.123.22
Host is up (0.00029s latency).
PORT    STATE SERVICE
123/udp open  ntp
MAC Address: F4:6D:04:8D:CE:9B (Unknown)

Read data files from: /usr/share/nmap
Nmap done: 1 IP address (1 host up) scanned in 0.12 seconds
            Raw packets sent: 2 (104B) | Rcvd: 2 (104B)


---------------------------------
 From CentOS client (test.sjv.lan/192.168.123.22)

[root at test ~]# getenforce
Disabled
[root at test ~]# nmap -sU -p U:123 -v 192.168.123.46

Starting Nmap 6.40 ( http://nmap.org ) at 2015-07-27 11:06 PDT
Initiating ARP Ping Scan at 11:06
Scanning 192.168.123.46 [1 port]
Completed ARP Ping Scan at 11:06, 0.01s elapsed (1 total hosts)
Initiating Parallel DNS resolution of 1 host. at 11:06
Completed Parallel DNS resolution of 1 host. at 11:06, 0.00s elapsed
Initiating UDP Scan at 11:06
Scanning ovpn.sjv.lan (192.168.123.46) [1 port]
Discovered open port 123/udp on 192.168.123.46
Completed UDP Scan at 11:06, 0.01s elapsed (1 total ports)
Nmap scan report for ovpn.sjv.lan (192.168.123.46)
Host is up (0.00028s latency).
PORT    STATE SERVICE
123/udp open  ntp
MAC Address: 52:54:00:AC:2E:08 (QEMU Virtual NIC)

Read data files from: /usr/bin/../share/nmap
Nmap done: 1 IP address (1 host up) scanned in 0.09 seconds
            Raw packets sent: 2 (104B) | Rcvd: 2 (104B)





On 15-07-27 09:52 AM, Wang, Yu wrote:
> nmap -sU -p U:123 -v 192.168.123.46


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