On Fri, Jun 3, 2011 at 4:05 AM, sguazt <marco.guazzone@gmail.com> wrote:
Hi,
Still have problems. Under /var/log/messages I've this message:
fail2ban.comm : WARNING Invalid command: ['add', 'ssh-iptables', 'auto']
Don't know if it is related to my problem.
Anyway, I am the only one that has this problem (or that runs fail2ban ;) )?
Hi there. Although I do not use fail2ban this sure looks like a bug. You should probably file a bug report.
If you want some protection from ssh intruders here are a couple of iptables rules you can use until the fail2ban problem is resolved.
-A local_input_filter -p tcp -m tcp --dport 22 --tcp-flags FIN,SYN,RST,ACK SYN -m recent --set --name SSH --rsource
-A local_input_filter -m recent --update --seconds 40 --hitcount 3 --name SSH --rsource -j DROP
If someone tries to login to your system via ssh more than 3 times in 40 seconds any further packets will be dropped. I've been using these rules for about 5 years and they work well.
Mike