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Originally posted by Matir ...very suspicious, if you ask me. Or stupid. One of the two.
You have to keep in mind that the attack could be coming from someone compromised by this very same attack. So for someone with a root password of "root", I wouldn't be surprised to see something equally as stupid ... like having basically every service known to man turned on
The problem with using mac addresses is that the machine connecting has to be on the local network due to the fact that mac addresses aren't remotely transmited (in OSI terminology they're utilized on the link layer not the network layer). So if you were connecting remotely over the internet, you couldn't filter based on the remote systems mac address.
Portsentry will add the offender to hosts.deny AND add a KILLROUTE. 3 caveats though:
1.) You need to run sshd on a differnet port
2.) You need to configure portsentry to monitor port 22
3.) To prevent your routing table from getting flooded, set-up a cronjob to flush it every 2 days or so