Thousands of ssh probes

Eitan Adler eitanadlerlist at
Fri Mar 5 13:06:40 UTC 2010

On Fri, Mar 5, 2010 at 2:54 PM, John <john at> wrote:
> My nightly security logs have thousands upon thousands of ssh probes
> in them.  One day, over 6500.  This is enough that I can actually
> "feel" it in my network performance.  Other than changing ssh to
> a non-standard port - is there a way to deal with these?  Every
> day, they originate from several different IP addresses, so I can't
> just put in a static firewall rule.  Is there a way to get ssh
> to quit responding to a port or a way to generate a dynamic pf
> rule in cases like this?
> --
> John Lind
> john at starfire.MN.ORG
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Look at security/blocksshd and security/denyhosts
Also changing SSH to a non-standard port helps - a lot.

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