Aug 10 22:26:34 hoge sshd[4349]: Failed password for root from 218.106.115.234 port 49937 ssh2
Aug 10 22:26:35 hoge sshd[4351]: Failed password for root from 218.106.115.234 port 50001 ssh2
Aug 10 22:26:37 hoge sshd[4353]: Failed password for root from 218.106.115.234 port 50051 ssh2

rootで入れるようにしてるとこなんてあるのか？