ssh日志问题??

Snoopy

Mar 31 16:19:27 Snoopy sshd:  succeeded
Mar 31 16:21:58 Snoopy sshd(pam_unix)[1117]: session opened for user root by (uid=0)
Mar 31 16:25:26 Snoopy sshd: sshd -TERM succeeded

我是用这个命令的 cat /var/log/messages |grep ssh

刚才我在别人的电脑里用ssh连上我,

回来后,日志里却没有也~,,,,也看不到对方ip,怎么办啊??