On 2012-06-28 23:31, Lou Katz wrote:
The other day, I looked carefully at my auth.log (Xubuntu 11.04) and discovered many lines of the form:
Jun 28 13:13:54 localhost sshd[12654]: Bad protocol version identification '\200F\001\003\001' from 94.252.177.159
In the past day, I have recorded about 20,000 unique IP addresses used for this type of probe. I doubt if this is a surprise to anyone - my question is twofold:
1. Does anyone want this evergrowing list of, I assume, compromised machines? 2. Is there anything useful to do with this info other than put the IP addresses into a firewall reject table? I have done that and do see a certain amount of repeat hits.
-=[L]=- You can use fail2ban to block bruteforcing hosts automatically and even report to your mail their whois info http://www.fail2ban.org/
--- Denys Fedoryshchenko, Network Engineer, Virtual ISP S.A.L.