DenyHosts

DenyHosts入れてみた後
http://denyhosts.sourceforge.net/

Oct 30 03:19:22 ns sshd[7518]: Did not receive identification string from 219.149.211.49
Oct 30 03:19:23 ns sshd[7519]: Did not receive identification string from 219.149.211.49
Oct 30 03:26:56 ns sshd[7918]: Illegal user delta from 219.149.211.49
Oct 30 03:27:02 ns sshd[7921]: Illegal user delta from 219.149.211.49
Oct 30 03:27:04 ns sshd[7928]: Illegal user test from 219.149.211.49
Oct 30 03:27:08 ns sshd[7932]: Illegal user testing from 219.149.211.49
Oct 30 03:27:11 ns sshd[7936]: Illegal user tester from 219.149.211.49
Oct 30 03:27:14 ns sshd[7934]: Illegal user test from 219.149.211.49
Oct 30 03:27:15 ns sshd[7941]: Illegal user academy from 219.149.211.49
Oct 30 03:27:19 ns sshd[7944]: Illegal user testing from 219.149.211.49
Oct 30 03:27:23 ns sshd[7946]: Illegal user protector from 219.149.211.49
Oct 30 03:27:24 ns sshd[7952]: refused connect from 219.149.211.49 (219.149.211.49)
Oct 30 03:27:25 ns sshd[7948]: Illegal user tester from 219.149.211.49
Oct 30 03:27:26 ns sshd[7953]: refused connect from 219.149.211.49 (219.149.211.49)

結構いい感じで/etc/hosts.deny に書き込んでいってくれたり。
ただredhatな鯖にはいれるのがめんどくさい(pythonが古い)ので会社のメインだけかな。