r8 - 2009-10-17 - 03:02:39 - AskBjoernHansenYou are here: NTP >  Servers Web > NTPPoolServers
NTP users are strongly urged to take immediate action to ensure that their NTP daemons are not susceptible to being used in distributed denial-of-service (DDoS) attacks. Please also take this opportunity to defeat denial-of-service attacks by implementing Ingress and Egress filtering through BCP38.

ntp-4.2.8p8 was released on 02 June 2016. It addresses 1 high- and 4 low--severity security issues, 4 bugfixes, and contains other improvements over 4.2.8p7.

Please see the NTP Security Notice for vulnerability and mitigation details.

Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.

NTP Pool Time Servers

pool.ntp.org uses DNS round robin to make a random selection from a pool of time servers who have volunteered to be in the pool. This is usually good enough for end-users. The minimal ntpd configuration file (e.g. /etc/ntpd.conf) for using pool.ntp.org is:

driftfile /var/lib/ntp/ntp.drift
server 0.pool.ntp.org
server 1.pool.ntp.org
server 2.pool.ntp.org
server 3.pool.ntp.org

ALERT! Any questions about the pool.ntp.org server pool should be directed either to the pool mailing list or to the comp.protocols.time.ntp usenet newsgroup.

IDEA! Time server operators are encouraged to visit the NTP Pool web-site to find out how they can join the NTP pool.

The NTP Pool DNS system automatically picks time servers which are geographically close for you, but if you want to choose explicitly, there are sub-zones of pool.ntp.org. The "continent" ones are:

Area: HostName:Sorted ascending
Worldwide pool.ntp.org
Asia asia.pool.ntp.org
Europe europe.pool.ntp.org
North America north-america.pool.ntp.org
Oceania oceania.pool.ntp.org
South America south-america.pool.ntp.org

There are also sub-zones for many countries. Click on your continent to see which country-zones are available there.

When using the by-country zones, be careful: some of them currently contain only one or two servers, so you are probably better off using either the zone of a nearby country, or using the continent or global zone (This is sometimes also valid if you live in a big country). In general though, just use the "global" zone as in the suggested configuration near the top of the page and let the system sort it out for you.

Related topics: RulesOfEngagement, StratumTwoTimeServers, ManagingYourListEntries, SubmittingYourListEntriesViaEmail, http://www.pool.ntp.org

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