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Internal network monitoring (lemmy.world)

submitted 3 weeks ago* (last edited 3 weeks 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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[–] plateee@piefed.social 7 points 3 weeks ago (1 children)

If you can swing compatible hardware, Security Onion is pretty great. It's not necessary to buy their solution, it's FOSS and there are instructions on getting it to work on proxmox.

(But you need to install agents on all your VMs and servers, and ideally do port mirroring so all traffic can make it to the Security Onion box.

[–] ueiqkkwhuwjw@lemmy.world 4 points 3 weeks ago

Very cool thanks for the recommendation.