ntp time clock

recently, found that the company domain member user time and the domain server time is not synchronized, to achieve: 1, the domain member server and intra-domain client and domain NTP server synchronization, 2, the domain NTP server as the client and the external NTP server

1th. NTP time server Setup 1.1ntp Introduction NTP (networktime Protocol, Network Time Protocol) is a protocol that is used to synchronize the time of each computer in a network. Its purpose is to synchronize the computer clock t

local network is less restricted.#restrict 192.168.1.0 Mask 255.255.255.0 nomodify notrap# Use public servers from the Pool.ntp.org project.# Please consider joining the pool (http://www.pool.ntp.org/join.html).Server cn.pool.ntp.org#broadcast 192.168.1.255 autokey# Broadcast Server#broadcastclient # Broadcast Client#broadcast 224.0.1.1 AutoKey # Multicast Server#multicastclient 224.0.1.1 # Multicast Client#manycastserver 239.255.254.254 # Manycast Server#manycastclient 239.255.254.254 AutoKey

receivetime = readtimestamp (buffer, receive_time_offset ); Long transmittime = readtimestamp (buffer, transmit_time_offset ); Long roundtriptime = responseticks-requestticks-(transmittime-receivetime ); Long clockoffset = (receivetime-originatetime) + (transmittime-responsetime ); If (config. logd) log. D (TAG, "round trip:" + roundtriptime + "Ms "); If (config. logd) log. D (TAG, "clock offset:" + clockoffset + "Ms "); // Save Our results Mntptime

setting the system clock. OPTIONS-P Print The time returned by the remote machine. -S Set the system time to the returned time. -U use UDP instead of TCP as the transport. -l use Syslog to output errors (cron.warning) and output (Cron.info). -T Set timeout in seconds for every attempt to retreive date. Rdate-s t

First, build time synchronization server1. Compile and install NTP serverRpm-qa | grep NTPIf not found, the NTP package is not installed, the NTP packet is found on the CD, and theRPM-UVH ntp***.rpmTo install2. Modify the ntp.conf configuration fileVi/etc/ntp.conf①, first co

control come from? By default, it is obtained through the system clock on the BIOS. You can see by following this command:W32tm-query-configuration650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/5D/1A/wKiom1Uh8_PAMwVHAAO8RUrTItE262.jpg "title=" 1.jpg " alt= "Wkiom1uh8_pamwvhaao8rurtite262.jpg"/>From the picture above we can note that this server is both an NTP server and an

the command line; Export TZ can be. When the date view time, the system is to find the TZ environment variable, TZ is not set to take the search for/etc/localtime file, so the TZ environment variable settings will overwrite the /etc/localtime file information, but the environment variable settings at the next logon is not valid, To be permanently valid, you can write commands to the/etc/profile file. Time

Network Time Protocol (NTP, Network Time Protocol) is used to synchronize all of its client clock services. The NTP server synchronizes the clock of the local system with a public NTP s

Protocol Package: The main fields are interpreted as follows: L LI (Leap indicator): The length is 2 bits, the value is "11" when the alarm state, the clock is not synchronized. NTP itself does not process for other values. L VN (version number): 3 bits in length, the version of NTP, the current version is 3. L Mode: Length is 3 bits, indicating the mode of ope

the built-in complementary metal oxide semiconductor (CMOS) clock is used. The setting forces the host to declare itself as a reliable time source, thereby using the built-in complementary metal oxide semiconductor (CMOS) clock. If you want to use the outside time server with the default a value can be. 5. Perform th

The newly installed CentOS system server may be set incorrectly. you need to adjust the time zone and adjust the time. The following is the process for CentOS to use NTP to synchronize time from a time server: Perform the following steps to synchronize

# hwclock -systohccn.pool.ntp.org is a public NTP server located in China to synchronize your time (If your time is different from the server's time cut, you may not be able to synchronize time or even execute commands such as sudo reboot ). 4. Set automatic online synchron

There are tow pen source software related to the NTP in Linux, the first is ntpdate, the second is ntpd. you can install them as following: Apt-Get installl NTP; Apt-Get install openntpd; Or emerge NTP; emerge openntpd. NtpdateCan be run manually as necessary to set the host clock, or it can be run from the host START

Network Time Protocol (NTP) is a network protocol used for Packet Exchange to synchronize the clock of two computers. NTP uses UDP port 123 as the transport layer. It is used to offset the impact of variable latency. NTP is one of the oldest network protocols in use (started

First, select the server base clock, you can select the internal hardware clock and external NTP timing server. (Make sure your time is accurate first) A. Configuring the Windows Time service to use the server internal hardware clock