mel at beckman.org
Wed May 1 23:28:53 UTC 2019
Harlan and Mehmet,
I can expand on one important reason that James only alluded to with his “Kepping the Auditors happy” comment.
Passing NTP through a firewall and then using that as a critical time reference source represents a huge security risk. Here’s one detailed explanation of that risk:
On May 1, 2019, at 3:48 PM, James R Cutler <james.cutler at consultant.com<mailto:james.cutler at consultant.com>> wrote:
On Wed, May 01, 2019 at 02:35:58PM -0700, Harlan Stenn wrote:
- Why do folks want to have one or more NTP server masters that have at
least 1 refclock on them in a data center, instead of having their data
center NTP server masters that only get time over the internet?
Answers to that include:
* Keeping the Auditors happy
* Knowing that “everyone does it” - the vendor told them so
* Bragging rights (expensive hardware)
* Being unbothered by fighting with facilities for building penetrations and antenna mounts
* Misunderstanding the beauty and economy Dave Mills marvelous algorithms for consistent time based on multiple sources, even those connected via internet
* Unwillingness or inability to leverage other local resources capacity to run ntpd with minimal impact in order to have a good constellation of local NTP servers
* Willingness to farm out time service without doing a deep dive into why and how, just leaving the design to the appliance vendors
This covers most of what I have encountered in providing enterprise time services for $dayjob+clients. I probably left out some significant points, but it has been a few years...
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