Client Authentication

Michael Ross gmx at
Wed Mar 27 00:08:24 UTC 2013

On Tue, 26 Mar 2013 22:56:37 +0100, Daniel O'Callaghan  
<danny at> wrote:

> On 27/03/2013 4:18 AM, Joseph Olatt wrote:
>>> Any ideas/suggestions on this will be appreciated.  Thanks,
>>> >
>>> >-- Doug
>> A little while back I wrote a system to do a simple Two Factor
>> Authentication and dynamic manipulation of PF (Packet Filter) Tables. I
>> created it to prevent brute-force attacks on the servers that I have
>> exposed on the Internet.
> I'm happy to share a program I wrote which slows down the brute force  
> attackers.
> It simply counts the SYN packets from a given IP and limits the rate per  
> minute by dropping the packet if they are coming too fast.
> Uses ipfw divert sockets, so would work if you prefer ipfw over pf.

Me Me Me! ...ahem.
I do prefer IPFW over PF and would very much like to try it out,
so please do share.



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