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Internal network monitoring (lemmy.world)

submitted 1 month ago* (last edited 1 month ago) by ueiqkkwhuwjw@lemmy.world to c/selfhosted@lemmy.world

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How do you monitor your homelab network for internal attackers? E.g. you have a publicly available service and theres a vulnerability that you miss or you pull a bad update and suddenly someone has access to your VM/machine/container. How could you increase the chances of automatically detecting that?

The built in IDS in opnsense seems pretty useless, and doesn't really help detect if e.g. someone is trying to exploit services between your vlans (I could be using it wrong though).

Crowdsec in opnsense is nice but it seems to also be primarily for protecting from malicious actors coming from the WAN.

I've heard about the opnsense zenarmor plugin but you have to agree to a privacy policy to use it?

Another option I guess would be collecting firewall logs and making custom notifications for things that you think would be suspicious on your network.

I also know update cooldowns and not exposing anything could largely solve this too, but the monitoring and alerting question really interests me.

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[–] ueiqkkwhuwjw@lemmy.world 5 points 1 month ago* (last edited 1 month ago) (1 children)

Thanks for your helpful answer.

Do you do all of that on a separate log sever? Or on your firewall? I haven't found a good way to do that on opnsense that doesn't feel hacky.

[–] thelittleblackbird@lemmy.world 5 points 1 month ago

My setup is "simple" and all these monitoring functions are performed in my opnsense box with the telegram plugin.

Most of the alerts are pretty basic and are done into the FW level or the outbound basic logging. So opnsense with the basic tooling is just enough.

I have in my todo to connect the logging system from opnsense to a proper Prometheus/grafana system to really have proper log of several days without having an impact on the FW but I never find the time to do it (lazyness problem)