David G. Miller wrote:
> Rainer Traut <tr.ml@...> writes:
>
>> Hi,
>>
>> to prevent scripted dictionary attacks to sshd
>> I applied those iptables rules:
> SNIP
>
> Lots of good advice from several people. All of the suggested solutions mean
> you still have to wade through log entries from the unsuccessful attacks.
>
> I've been quite happy with similar IP tables rules but I moved sshd to listen on
> something other than port 22 for external connections. I haven't seen a single
> brute force attack since making the move and all unsuccessful attempts to login
> via ssh get logged so it's not like attackers can stay below my radar.
>
> It seems that the script kiddies who are responsible for most of these attacks
> don't bother scanning (nmap) before the attack. If port 22 isn't open they move
> elsewhere. If I ever see any failed login attempts I can assume that the
> perpetrator is at least a little more skilled than usual and possibly take
> additional action.
>
> Cheers,
> Dave
>
I use Denyhosts for my security. All attacking IP's are blocked
automatically and sent to Denyhosts database server. Those IP's, from
around the world are then shared amongst all denyhosts users/systems, so
I am already protected from IP's attacking others.
Ljubomir
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