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ipmideck talks to your servers over IPMI 2.0 over LAN. On most servers this LAN channel is disabled by default (or shipped with default credentials), so before ipmideck can reach a BMC you need to enable IPMI-over-LAN and configure a user account on the controller itself. IPMI-over-LAN uses UDP port 623 (the IPMI/RMCP+ port). Make sure that port is reachable from the host running ipmideck and that any firewall between the host and your BMCs allows it.
The steps in these guides come from each vendor’s official documentation, but BMC web-interface paths vary between firmware generations and models. Verify each path against your own hardware before relying on it. Where a vendor’s documentation is sparse, the page says so explicitly.

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Pick your BMC

Each guide walks through enabling IPMI-over-LAN in that vendor’s BMC web interface, including default credentials, the enable toggle, and a verification command.

Dell iDRAC

iDRAC7 / iDRAC8 / iDRAC9 — PowerEdge servers.

Supermicro

Supermicro IPMI 2.0 BMC (X8–X12 boards). Low-confidence — verify on hardware.

HPE iLO

HPE iLO 4 / iLO 5 — ProLiant servers.

Lenovo XCC

Lenovo XClarity Controller (XCC / XCC2) — ThinkSystem servers.

IBM IMM

IBM IMM2 — System x servers. Low-confidence — verify on hardware.

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After you enable it

Once IPMI-over-LAN is on and you have a BMC user account, verify connectivity from the host that will run ipmideck: 
ipmitool -I lanplus -H <bmc-ip> -U <user> -P <password> chassis status
A successful response confirms the LAN channel is live. Then add the server in ipmideck’s setup wizard — see Getting Started and Supported Hardware.
Many vendors recommend disabling IPMI-over-LAN again when it is not in use, since the protocol’s authentication is weaker than the BMC’s HTTPS interface. Keep your BMCs on a trusted management network and use strong, non-default credentials.