Fail2ban activity.

Hi Luvers, Just seeking an opinion from those using fail2ban. I am seeing a lot of fail2ban activity (ie banning of IP on ssh) on a particular server. This is far more than I am getting for other servers I am managing. What do people using fail2ban usually see on average. I am seeing new ips being banned pretty much every 10-15 mins on this server. Is this a lot or normal? Given that other servers may not see one for days. Cheers Daniel.