Dell iDRAC is Supported / tested with ipmideck. These steps are from official Dell
documentation and a real iDRAC6, confirm the navigation path matches your iDRAC firmware
before relying on it.
Steps
Open the iDRAC web interface
In a browser, navigate to the iDRAC IP address (factory default 
192.168.0.120) and
log in. The default PowerEdge credentials are root / calvin, change these
immediately if they are still in use.Open Network/Security → Network
In the left pane choose iDRAC Settings, then open the Network/Security tab and
its Network sub-tab. This page holds the IPv4 settings and, further down, the
IPMI Settings.
On iDRAC9 the equivalent path is iDRAC Settings → Connectivity → Network.
Enable IPMI Over LAN
Scroll to the IPMI Settings section and tick Enable IPMI Over LAN. Set the
Channel Privilege Level Limit to Administrator (or at least Operator) so
ipmideck can read sensors and control power.
Set an encryption key (optional)
The Encryption Key can stay all-zeros (the default) for a standard
lanplus
session. Set a 40-character hex key only if your security policy requires it.
Path differs by generation: iDRAC6 / iDRAC7 / iDRAC8 use Network/Security → Network →
IPMI Settings (shown above), while iDRAC9 uses iDRAC Settings → Connectivity → Network.
Verify the exact path against your hardware.