 Public Time Servers
Domain Time II Server
Version 5.2 |
If you don't have your own GPS receiver, cesium clock, or other trusted time source on your
local network, you will need to obtain the time over the Internet from a public time server.
This page will help you locate an appropriate server.
Note: Internet time servers are not always reliable; they can be overloaded, misconfigured, or subject to network delays and other issues.
Be sure to enable the Analyze time samples... option
and include at least three time sources in your configuration (setting each source to request 3 samples) to help compensate for these problems.
You should test each time server you choose for reliability and accuracy before committing to use it in production.
The Domain Time II Time Server Test (included with Domain Time II Manager)
and NTPCheck
(included with Domain Time II Server and Client) utilities are ideal for this purpose.
Do not assume you can use the default time servers listed by Domain Time II Server. These servers
are listed as a convenience, to help you get started. You must honor the requirements
posted by each time service provider. Usually nothing more than asking permission is required.
Some servers have regional restrictions; others only allow specific NTP strata; others may have
other requirements. It is your responsibility to ensure compliance. Time service providers
operate on the honor system, and the system will only continue functioning smoothly if everyone abides by
the rules.
Symmetricom Servers
Symmetricom provides time servers for its customers only. Licensed users may use
them as primary and secondary time sources. You may, of course, also use these
servers for testing purposes, but please do not use these servers regularly
unless you are a Symmetricom customer!
- ntp1.symmetricom.com
TrueTime TimeVault
NTP Stratum 2
Protocols: NTP
Access: Any registered customer may use this server as a time source for Domain Time Server.
Please do not point individual clients at this server. Please do not check more than once per minute.
- ntp2.symmetricom.com
TrueTime TimeVault
NTP Stratum 2
Protocols: NTP
Access: Any registered customer may use this server as a time source for Domain Time Server.
Please do not point individual clients at this server. Please do not check more than once per minute.
Public NTP Servers
There are hundreds of NTP/SNTP servers available on the Internet. Be a good network citizen; if you have more than 100
clients on your network, your main server may qualify for connecting to a Stratum 1
server, otherwise you should pick a Stratum 2 server.
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