Mark Wendt (Contractor) wrote:
> Realistic?  I get messages from my intrusion detectors every day of 
> folks from all over the world scanning my ports, trying to find a way 
> in.  They hit a block of IP addresses and scan all of them in that 
> block.
A very effective way to stop this is to use denyhosts.  I have now set 
the limits very tight, if a particular IP is the source of more than 2 
unsuccessful login attempts within a month, it gets added to the 
hosts.deny list, and takes 180 days to get off that list.  I had some 
very determined hackers using a stable of several hundred compromised 
nodes to attack my machine.  They are still trying, but they are totally 
being blocked.  The main feature of denyhosts is that it doesn't care 
about port number, any failed login from ANY port is added to the 
threshold, and then being on hosts.deny pretty much blocks any access.

Jon

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