You can find dedicated BMC port (ethernet port) on the rear side.
Examples : Dell iDRAC / HP iLO / Supermicro IPMI
BMC is set as DHCP in factory default.
If BMC is connected to DHCP server, it receives a specific IP address. Or, you can set a static IP address on the BMC via BIOS.
You can access BMC via web browser with that IP address.
You can access BMCs of serveral servers via virtual machine in the host below.
INTERNET External | eno1|(firewall enabled) +------------+------------+ | | | HOST | | +----------+| | | RDP-VM || | |172.19.0.3|| | +----------+| +------------+------------+ br0(eno2)|172.19.0.1 Internal | | Servers (IPMI,iDRAC,iKVM../172.19.0.X) |