this post was submitted on 04 May 2025
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CrowdSec vs Fail2Ban - What to use? (programming.dev)
submitted 1 year ago* (last edited 1 year ago) by Matty_r@programming.dev to c/selfhosted@lemmy.world
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Hey all, i've decided I should probably setup something else to help block nefarious IP addresses. I've been looking into CrowdSec and Fail2Ban but i'm not really sure the best one to use.

My setup is OpnSense -> Nginx Proxy Manager -> Servers. I think I need to setup CrowdSec/Fail2Ban on the Nginx Proxy Manager to filter the access logs, then ideally it would setup the blocks on OpnSense - but i'm not sure that can be done?

Any experience in a setup like this? I've found a few guides but some of them seem fairly outdated.

Edit: thanks everybody for the great info. General consensus seems to be with crowdsec so I'll go down that path and see how it goes.

Edit 2: So after having it up and running for the better part of a day, i'm going to remove it again. For some reason there was a performance impact loading websites, probably because it was waiting for a response from the Crowdsec hub? Either way, after stopping it from running everything is back to normal again. So I might revisit how I do it and probably try Fail2Ban now instead. Thanks everybody

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[–] SirMaple__@lemmy.ca 1 points 1 year ago* (last edited 1 year ago) (1 children)

I've been thinking about going this route. What size subnet are you banning? /24?

Only thing stopping me is I selfhost email and don't want to ban say a whole subnet from Microsoft/Azure and end up blocking the outgoing servers for O365. I'm sure I can dig around and look at the prefixes to see which are used for which of their services just haven't had the time yet.

[–] mbirth@lemmy.ml 4 points 1 year ago (1 children)

I let CrowdSec determine that. I'm seeing /13, /12 and even /10 in my decisions list. All seem to be Amazon AWS ranges.

[–] sudneo@lemm.ee 2 points 1 year ago

Wow, those are big networks. Obviously I suppose in case of AWS it doesn't matter as no human visitor (except maybe some VPN connection?) will visit from there.

As someone who bans /32 IPs only, is the main advantage resource consumption?