Automatic blacklist of IP-addresses.

[Nils Hammar]

One feature that I haven't seen in OpenSSH (It may be there) is an 
automatic blacklisting of IP addresses when a certain number of login 
attempts are reached from that IP address. It seems like it is popular 
these days to try brute force access on password cracking and automatic 
blacklisting may limit these attempts.

Best regards/Nils Hammar