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Time Server NTP - ipNTP
Network Time Protocol (NTP)
The Network Time Protocol is a standard rule set for the syncronization of clocks in computer systems via packet communication networks (for example: Ethernet). The Network Time Protocol (NTP) uses the connectionless network protocol UDP for Ethernet. This enables reliable time indication over networks with variable packet transit times.
General principles
NTP is one of the oldest Ethernet TCP/ IP protocols in use. It uses the UDP port 123. The current version is V4. It synchronizes the local clock with the help of external time signals transmitted either directly from a local recipient (DCF77 or GPS ) or from an NTP server.
NTP uses a hierarchical system of differet strata. While NTP time servers with stratum 1 are connected with a very precise external clock (such as a GPS or DCF77 radio), network time servers with stratum 2 derive their time from one or more systems with stratum 1, etc.
SNTPThe Simple Network Time Protocol (SNTP) is a simplified version of the NTP. It is described in RFC4330.
SNTP is implemented in the UNIX and Linux operating systems assuming the form of ntpd/xntpd background processes.
In the more recent Windows versions as of Windows XP, SNTP is used by the operating system to keep the local computer currently on time. This process is performed in the background with win32time. Due to the fact that Microsoft introduced this procedure rather late, many providers have in the meantime developed independent and usually better programs for time synchronization under Windows.
Abouttime
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freeware |
Windows
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AtomSync
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shareware |
Windows
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Automachron
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shareware |
Windows
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Crony
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open source
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Linux
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NTPTime
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freeware |
Windows
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NetTime 2.07b
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freeware |
Windows
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NetTime 2.2
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gpl
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Windows
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OpenNTPD
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freeware |
Linux, Mac OS, Solaris
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Tardis 2000 v1.5
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shareware |
Windows
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More information
A detailed documentation can be found under the link: http://www.ntp.org
Redundant servers for synchronization
Under Windows operating systems, redundant synchronization can be performed only with the help of NTP time server clients.
Therefore, a second IP address must be entered for the NTP server at the host, so that as sson as a connection to the first time server
is no longer possible, the system will try to get synchronized with the second server.
Public NTP servers:
| de.pool.ntp.org |
Public pool of NTP servers in Germany |
| europe.pool.ntp.org |
Public pool of NTP servers in Europe |
| de.pool.ntp.org |
Public pool of NTP servers |
Time synchronisation with Windows operating systems
Time synchronisation with Unix/Linux operating systems |
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