[tech] Snort: should we block attacking hosts?

[Daniel Axtens]

Greetings!

Perusal of the daily snort emails shows that much of the alerts are generated by a relatively small number of hosts, mostly trying to propagate some sort of MS-SQL worm.

What are people's opinions on setting up fail2ban to drop traffic coming from hosts who send lots of known-bad traffic?

The obvious downside is potential DOS on valid users. How big is this risk and do we care?

Thanks in advance,
-- d