How IPMI and the BMC Work
The BMC is a separate microcontroller on the server motherboard with its own network port, flash storage, and power supply (draws standby power when the server is plugged in but powered off). It runs its own embedded OS and provides a web interface and IPMI protocol endpoint accessible over the network on a dedicated management IP address.
From a connected client, you can: power the server on, off, or cycle; view and interact with the BIOS or UEFI setup screen; mount a remote ISO image as a virtual CD-ROM to reinstall the OS; read CPU temperature, fan speeds, and power consumption; view the POST process even if the OS never boots; and configure BIOS settings remotely. All of this works regardless of the state of the installed operating system.
Vendor Names: iDRAC, iLO, IPMI
IPMI is the industry standard protocol specification (IPMI v2.0 is the current version). Most server-grade motherboards implement IPMI.
iDRAC (Integrated Dell Remote Access Controller) is Dell's BMC implementation for PowerEdge servers. iDRAC9 (current generation) provides a full HTML5 web console, virtual media mount, lifecycle controller for OS deployment, and a REST API (Redfish). iDRAC Basic is included; iDRAC Enterprise adds group management features.
iLO (Integrated Lights-Out) is HPE's BMC for ProLiant servers. iLO 5 and iLO 6 provide similar capabilities to iDRAC including HTML5 remote console and virtual media. iLO Advanced licenses unlock full-speed KVM — the base license throttles console frame rate.
IPMI on consumer boards: Some high-end consumer and workstation motherboards (especially from Supermicro and ASRock Rack) include a BMC with full IPMI. Standard consumer motherboards from Asus, Gigabyte, and MSI typically do not include IPMI.
IPMI Security Considerations
IPMI provides root-level control over your server — whoever controls IPMI controls the hardware. Never expose IPMI directly to the internet. Always put IPMI on a dedicated management VLAN that is inaccessible from untrusted networks. Historical IPMI implementations (v1.5 and early v2.0) had serious vulnerabilities including cipher suite 0 (authentication bypass) and RAKP authentication issues. Modern iDRAC and iLO firmware has addressed these, but the principle of isolating management interfaces is non-negotiable.
For a homelab, create a separate VLAN for management interfaces (switch management IP, IPMI/iDRAC/iLO, AP admin) and allow access only from your trusted workstation VLAN. This mirrors enterprise network design and builds correct habits.
IPMI / BMC Implementations Compared
| Brand Name | Vendor | Protocol | Remote Console | Virtual Media | Typical in |
|---|---|---|---|---|---|
| iDRAC (9/10) | Dell | IPMI v2.0 + Redfish | HTML5 (no plugin) | Yes (ISO mount) | PowerEdge servers |
| iLO (5/6) | HPE | IPMI v2.0 + Redfish | HTML5 (license throttles) | Yes (ISO mount) | ProLiant servers |
| IMM / XCC | Lenovo | IPMI v2.0 + Redfish | HTML5 | Yes | ThinkSystem servers |
| IPMI (generic) | Supermicro / ASRock Rack | IPMI v2.0 | HTML5 or Java KVM | Yes | Workstation/server boards |
| No BMC | Consumer boards | N/A | N/A | N/A | Desktop/consumer motherboards |
Frequently Asked Questions
Do I need IPMI for a homelab?
Not strictly — many homelabbers manage their servers just fine with SSH and physical access for the rare crash. But if your server is in a closet or another room, IPMI is extremely convenient. The ability to mount an ISO and reinstall an OS without touching the machine saves significant time. Used enterprise servers (Dell PowerEdge, HPE ProLiant) include IPMI as standard, which is one reason they are popular homelab hardware.
Can I use IPMI over a VPN?
Yes. If your IPMI management VLAN is accessible through your home VPN (WireGuard or OpenVPN on your pfSense/OPNsense router), you can access the IPMI web console from anywhere. This is the recommended approach for remote access — do not expose IPMI directly to the internet.
What tools can I use to access IPMI from the command line?
ipmitool is the standard open-source CLI tool for IPMI. It runs on Linux, macOS, and Windows. You can query sensors (ipmitool -H
Is IPMI the same as KVM over IP?
IPMI is the management protocol and hardware standard. KVM over IP (Keyboard, Video, Mouse over IP) is one feature provided by IPMI implementations — it lets you view the server screen and type keystrokes remotely as if you were sitting in front of it. KVM over IP works even during BIOS POST and OS crashes, unlike VNC or RDP which require the OS to be running.