The NSX-T Manager must be configured to synchronize internal information system clocks using redundant authoritative time sources.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-251782	SRG-APP-000373-NDM-000298	TNDM-3X-000068	SV-251782r879746_rule	2023-06-22	1

Description
The loss of connectivity to a particular authoritative time source will result in the loss of time synchronization (free-run mode) and increasingly inaccurate time stamps on audit events and other functions. Multiple time sources provide redundancy by including a secondary source. Time synchronization is usually a hierarchy; clients synchronize time to a local source while that source synchronizes its time to a more accurate source. The network device must utilize an authoritative time server and/or be configured to use redundant authoritative time sources. This requirement is related to the comparison done in CCI-001891. DoD-approved solutions consist of a combination of a primary and secondary time source using a combination or multiple instances of the following: a time server designated for the appropriate DoD network (NIPRNet/SIPRNet); United States Naval Observatory (USNO) time servers; and/or the Global Positioning System (GPS). The secondary time source must be located in a different geographic region than the primary time source.

Description

The loss of connectivity to a particular authoritative time source will result in the loss of time synchronization (free-run mode) and increasingly inaccurate time stamps on audit events and other functions. Multiple time sources provide redundancy by including a secondary source. Time synchronization is usually a hierarchy; clients synchronize time to a local source while that source synchronizes its time to a more accurate source. The network device must utilize an authoritative time server and/or be configured to use redundant authoritative time sources. This requirement is related to the comparison done in CCI-001891. DoD-approved solutions consist of a combination of a primary and secondary time source using a combination or multiple instances of the following: a time server designated for the appropriate DoD network (NIPRNet/SIPRNet); United States Naval Observatory (USNO) time servers; and/or the Global Positioning System (GPS). The secondary time source must be located in a different geographic region than the primary time source.

ℹ️ Check
From the NSX-T Manager web interface, go to System >> Fabric >> Profiles >> Node Profiles. Click "All NSX Nodes" and verify the NTP servers listed. or From an NSX-T Manager shell, run the following command(s): > get ntp-server If the output does not contain at least two authoritative time sources, this is a finding. If the output contains unknown or non-authoritative time sources, this is a finding.

ℹ️ Check

From the NSX-T Manager web interface, go to System >> Fabric >> Profiles >> Node Profiles. Click "All NSX Nodes" and verify the NTP servers listed. or From an NSX-T Manager shell, run the following command(s): > get ntp-server If the output does not contain at least two authoritative time sources, this is a finding. If the output contains unknown or non-authoritative time sources, this is a finding.

✔️ Fix
To configure a profile to apply NTP servers to all NSX-T Manager nodes, do the following: From the NSX-T Manager web interface, go to System >> Fabric >> Profiles >> Node Profiles. Click "All NSX Nodes" and then click "Edit". Under NTP servers, remove any unknown or non-authoritative NTP servers, enter at least two authoritative servers, and then click "Save". or From an NSX-T Manager shell, run the following command(s): > del ntp-server <server-ip or server-name> > set ntp-server <server-ip or server-name>

✔️ Fix

To configure a profile to apply NTP servers to all NSX-T Manager nodes, do the following: From the NSX-T Manager web interface, go to System >> Fabric >> Profiles >> Node Profiles. Click "All NSX Nodes" and then click "Edit". Under NTP servers, remove any unknown or non-authoritative NTP servers, enter at least two authoritative servers, and then click "Save". or From an NSX-T Manager shell, run the following command(s): > del ntp-server <server-ip or server-name> > set ntp-server <server-ip or server-name>