Ok, this made me curious enough to do a bit of research...

Suggested system for a honeypot but not exactly auto updating:
http://asashi.net/pages/monopubip.html

pfSense may have a way to do it (I like the 'for your amusement' part):
"DenySSH monitors the auth log of a BSD system for failed SSH login 
attempts and adds repeat attackers to a Packet Filter table, allowing 
you to define PF rules to block the attacking hosts or redirect them to 
a honeypot for your amusement" http://www.ohloh.net/tags/freebsd/security

http://cvstrac.pfsense.org/honeypot

http://xkcd.com/350/


Drew Lehman wrote:
> Has anyone already played with the idea of having a honeypot that sends
> information to the monowall to block any address that accesses the honeypot.
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