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Re: fail2ban for NetBSD-based routers & networks

On Mon, Feb 11, 2013 at 9:00 PM, Erik Fair <> wrote:
> I use NetBSD as a router for my public IP network. It works pretty well, but 
> I'm getting really tired of the door-knob turners who keep trying accounts & 
> passwords on ssh, IMAP, etc. I would like to shut them out of the network as 
> a a whole at my router efficiently.
> I can't do much about UDP attacks on DNS - those may or may not have a valid 
> source IP address, so it would be foolish to trust that enough to use it as 
> filtering source data. However, any TCP based attack has to be two-way, so 
> that's worth banning.
> Does anyone have a fail2ban equivalent for NetBSD that has:
> authentication of the sources of the filtered addresses (by that I mean, any 
> one of N authenticated hosts may contribute an address to the filter, but no 
> one gets to lie to it - yes, I recognize that this means it must operate 
> under one administrative authority),
> aging management of the blacklist, i.e. addresses age out, but if they come 
> back, the age-out period goes up either geometrically or exponentially, and
> the blacklist is persistent across router reboots, e.g. a database in /var/db 
> exists which an rc script will load into the operational blacklist at boot.
> Clearly, such a daemon/service has to use one of the filtering mechanisms 
> available in NetBSD, e.g. ipf, pf; it would be helpful to know which of those 
> have been exercised enough to be trusted with a potentially high rate of 
> table/filter change without crashing the kernel.
>         thanks,
>         Erik <>

fail2ban is in wip

I started working on a fork many weekends ago but didn't get very far
due to the path assumptions made in the software.

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