Symptoms

After updating to iDRAC9 6.xx.xx.xx firmware versions from earlier iDRAC9 3.xx/4.xx/5.xx firmware versions, the iDRAC9 DNS settings will shift from Disabled to Enabled. These settings changes can lead to the iDRAC9 becoming inaccessible by FQDN string. The following DNS settings will shift from Disabled to Enabled after update: Auto Config Domain NameUse DHCP to Obtain DNS Server AddressesUse DHCPv6 to obtain DNS Server Addresses iDRAC9 UI > iDRAC Settings > Connectivity > Network > Common Settings Example: iDRAC9 UI > iDRAC Settings > Connectivity > Network > IPv4 Settings Example: iDRAC9 UI > iDRAC Settings > Connectivity > Network > IPv6 Settings Example: This behavior is expected when traversing from iDRAC 5.xx.xx.xx firmware to iDRAC 6.xx.xx.xx firmware versions. The default DNS values were modified for Auto Config Domain Name attributes. This was a one-time change to add DNS support for Zero-Touch Deployment by FQDN. The change is captured within several online iDRAC9 6.xx.xx.xx documents. iDRAC9 6.00.02.00 Release Notes: iDRAC9 6.00.02.00 Release Notes Automation — API and CLI Redfish Lifecycle Events (RLCE) in Telemetry Added threshold range values to Telemetry Sensor reports Added basic memory error information, available through Redfish APIs Support for Redfish 2020.3, 2020.4 updates Note: For more information about these features, see the Redfish API guide at developer.dell.com. Support for additional Redfish 2020.1 and 2020.2 updatesAdded support for CA certificates to the Server Configuration Profiles (SCP)Use DHCP to Obtain DNS Server AddressesReport "OS installation complete" statusAdded progress bar for Server Configuration Profiles exportServer HostName included in iDRAC Redfish EventsRedfish support for property "LastPowerOutputWatts"Support for aliasing of Top-Level Redfish URIsSupport for Zero-Touch Deployment using mDNSFQDN support in Zero-Touch Deployment iDRAC9 6.10.30.00 Release Notes: iDRAC9 6.10.30.00 Release Notes iDRAC firmware In iDRAC, attaching a folder that is in an NFS share hosted by a Linux-based operating system is not supported.In the Lifecycle (LC) interface, It is recommended to avoid performing any operations on media that are mounted as RFS through iDRAC GUI/RACADM/Redfish.Updating iDRAC firmware to version 6.xx or later changes the static IPv4 or IPv6 DNS settings. Ensure that you reconfigure the network settings after the upgrade is complete. iDRAC9 6.xx User Guide: iDRAC9 User's GuideConfiguring the network settingsTo configure the network settings: Note: For information about the options, see the iDRAC Settings Utility Online Help. Note: While configuring network settings, use DHCP to Obtain DNS Server Addresses. Use DHCPv6 to Obtain DNS Server Addresses, and Auto Config Domain Name options are enabled by default after updating iDRAC to release version 6.00.00.00. Also DNS Domain Name gets DHCP Domain name, and older static domain name gets ignored after updating to version 6.00.00.00.

Cause

iDRAC9 6.00.02.00 firmware intentionally modified the default setting values for the iDRAC DNS DHCP settings to Enabled. This change was required to enable Zero-Touch Deployment feature using FQDN with DHCP client straight from factory shipments.

Resolution

iDRAC9 DNS settings may need to be reverted back to the Disabled setting after updating to iDRAC9 6.xx.xx.xx firmware versions from earlier firmware releases. The iDRAC will still be accessible using remote interfaces through IPv4 or IPv6 addressing. Also, DRACTOOLS RACADM utility can be leveraged through Host Operating System to modify the iDRAC Settings. #Disable Auto Config Domain Name Example: racadm>>racadm set idrac.NIC.DNSDomainFromDHCP Disabled [Key=idrac.Embedded.1#NIC.1] Object value modified successfully #Disable IPv4 Use DHCP To Obtain DNS Server Example: racadm>>racadm set idrac.ipv4.DNSFromDHCP Disabled [Key=idrac.Embedded.1#IPv4.1] Object value modified successfully #Disable IPv6 Use DHCP to Obtain DNS Server Example: racadm>>racadm set idrac.ipv6.dnsfromdhcp6 Disabled [Key=idrac.Embedded.1#IPv6.1] Object value modified successfully

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