системный журнал – auth.log

Я здесь довольно новый. Я смотрел на свои системные журналы и заметил это:

Jul 21 00:57:47 htpc sshd[13001]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=188.120.248.13 user=root Jul 21 00:57:49 htpc sshd[13001]: Failed password for root from 188.120.248.13 port 56899 ssh2 Jul 21 00:57:49 htpc sshd[13001]: Received disconnect from 188.120.248.13: 11: Bye Bye [preauth] Jul 21 00:57:52 htpc sshd[13003]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=188.120.248.13 user=root Jul 21 00:57:54 htpc sshd[13003]: Failed password for root from 188.120.248.13 port 54709 ssh2 Jul 21 00:57:54 htpc sshd[13003]: Received disconnect from 188.120.248.13: 11: Bye Bye [preauth] Jul 21 00:57:57 htpc sshd[13005]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=188.120.248.13 user=root Jul 21 00:57:58 htpc sshd[13005]: Failed password for root from 188.120.248.13 port 59488 ssh2 Jul 21 00:57:58 htpc sshd[13005]: Received disconnect from 188.120.248.13: 11: Bye Bye [preauth] 

Он просто продолжает идти. Кто-нибудь знает, что это такое?

Заранее спасибо.