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freebsd 6.1 被攻擊了

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jeffher.tw:
Dear All,

       之前設定好pppoe 上網, 已經正常好一段時間了,不過今天早上發現一直出現警告訊息如下:
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Feb  3 09:02:39 freebsd sshd[53100]: error: PAM: authentication error for illegal user hatton from 162.248.221.57
Feb  3 09:02:41 freebsd sshd[53103]: error: PAM: authentication error for illegal user orange from 162.248.221.57
Feb  3 09:02:44 freebsd sshd[53106]: error: PAM: authentication error for illegal user beavis from 162.248.221.57
Feb  3 09:02:46 freebsd sshd[53109]: error: PAM: authentication error for illegal user tigger from 162.248.221.57
Feb  3 09:02:49 freebsd sshd[53112]: error: PAM: authentication error for illegal user purple from 162.248.221.57
Feb  3 09:02:51 freebsd sshd[53115]: error: PAM: authentication error for illegal user mustang from 162.248.221.57
Feb  3 09:02:54 freebsd sshd[53118]: error: PAM: authentication error for illegal user justin from 162.248.221.57
Feb  3 09:02:56 freebsd sshd[53121]: error: PAM: authentication error for illegal user chris from 162.248.221.57
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請問這個有方法可以拒絕這樣的攻擊嗎?
另外因為警告訊息一直出現, 連打指令都會被中斷, 有辦法改善這種情況嗎?  :)

jeffher1024

darkranger:
http://phorum.study-area.org/index.php/topic,53156.0.html

jeng:
如果沒有要對外開放ssh ,建議只開放允許內網登入

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