On 06/02/2014 11:46, Notify Me wrote: > We're a redhat shop, and we use redhat auth which by default uses redhat > NTP sources. Sounds odd to me too. They claim this is what PCI DSS demands.
PCI DSS states: > 10.4.3 Time settings are received from industry-accepted time sources. The default RHEL time servers are defined as X.rhel.ntp.org. Many people would consider ntp.org as industry-accepted, and there are several PCI-DSS auditing companies out there who explicitly recommend using pool.ntp.org for this purpose. If that's not good enough, the PCI DSS standards explicitly state in the NTP interpretation section: > More information on NTP can be found at www.ntp.org, including > information about time, time standards, and servers. So, if PCI themselves view ntp.org as being authoritative about NTP I can't see any reason why the time servers they publish wouldn't pass an audit. Nick