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this post was submitted on 14 Jul 2023
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Usually you define a VLAN dedicated to your IPMI devices, only accessible through an access-controlled way (usually, VPN served by the firewall but don't do that if you're virtualizing the firewall for obvious reasons). The DC might offer a VPN of their own specifically for this purpose, or you can pay them for more space to install a physical firewall but that's a more significant investment.
Ultimately best practices say not to expose the IPMI to the internet, but if you really have no choice and your thing is up to date then you only need to fear 0-days and brute force attacks, the login pages are usually pretty secure since access is equivalent to physical access. You will attract a lot of parasite traffic probing for flaws though.