IF you try to get IPMI Commands from your Dell DRAC and keep getting the error:
Error: Unable to establish IPMI v2 / RMCP+ session
The the problem is most likely that "IPMI over Lan" is dissabled. You can find out the status of "IPMI over Lan" by using the Dell EMC OpenManage System Administration (OMSA) omreport tool and issuing the following command:
omreport chassis remoteaccess
IF you see the line
Enable IPMI Over LAN : No
You can issue the command:
omconfig chassis remoteaccess config=nic enableipmi=true
And this will enable IPMI Over Lan.
On a side note, if you receive this error:
Error: Unable to establish LAN session
Error: Unable to establish IPMI v1.5 / RMCP session
Then make sure you are using IPMI v2 Lanplus (the `-I lanplus` option in ipmitool) so that your IPMI software is communicating using the right protocol.