十万火急的问题？各位看下！

ycfei

服务为网吧的做NAT之用。最近出现如下情况。
Jun  3 20:13:57 FC4 login(pam_unix)[2440]: session opened for user root by (uid=0)
Jun  3 20:13:58 FC4  -- root[2440]: ROOT LOGIN ON tty1
Jun  3 20:18:49 FC4 kernel: e1000: eth1: e1000_watchdog_task: NIC Link is Down
Jun  3 20:18:55 FC4 kernel: e1000: eth1: e1000_watchdog_task: NIC Link is Up 100 Mbps Full Duplex
Jun  3 20:19:04 FC4 kernel: e1000: eth1: e1000_watchdog_task: NIC Link is Down
Jun  3 20:19:07 FC4 kernel: e1000: eth1: e1000_watchdog_task: NIC Link is Up 100 Mbps Full Duplex
Jun  3 20:20:24 FC4 kernel: e1000: eth1: e1000_watchdog_task: NIC Link is Down
Jun  3 20:20:26 FC4 kernel: e1000: eth1: e1000_watchdog_task: NIC Link is Up 100 Mbps Full Duplex
Jun  3 20:20:27 FC4 kernel: e1000: eth1: e1000_watchdog_task: NIC Link is Down
Jun  3 20:20:31 FC4 kernel: e1000: eth1: e1000_watchdog_task: NIC Link is Up 100 Mbps Full Duplex
Jun  3 20:20:32 FC4 kernel: e1000: eth1: e1000_watchdog_task: NIC Link is Down
Jun  3 20:21:47 FC4 kernel: e1000: eth1: e1000_watchdog_task: NIC Link is Up 100 Mbps Full Duplex
Jun  3 20:56:27 FC4 sshd(pam_unix)[2507]: session opened for user root by root(uid=0)
Jun  4 01:42:00 FC4 kernel: conntrack_ftp: partial PORT 3515886544+26
Jun  4 11:33:02 FC4 kernel: conntrack_ftp: partial PORT 310688674+25
Jun  4 15:25:32 FC4 kernel: conntrack_ftp: partial 227  3578119009+13
Jun  4 19:47:49 FC4 kernel: conntrack_ftp: partial 227  3312963942+23
Jun  5 09:04:39 FC4 sshd(pam_unix)[2567]: session opened for user root by root(uid=0)
Jun  5 09:06:29 FC4 sshd(pam_unix)[2596]: session opened for user root by root(uid=0)
Jun  5 09:18:26 FC4 sshd(pam_unix)[2650]: session opened for user root by root(uid=0)
Jun  5 12:26:45 FC4 sshd(pam_unix)[2806]: session opened for user root by root(uid=0)
Jun  5 12:27:54 FC4 sshd(pam_unix)[2841]: session opened for user root by root(uid=0)
Jun  5 12:50:20 FC4 sshd(pam_unix)[2982]: session opened for user root by root(uid=0)
Jun  5 21:15:45 FC4 sshd(pam_unix)[3031]: session opened for user root by root(uid=0)
Jun  6 09:00:05 FC4 kernel: conntrack_ftp: partial PORT 2920820967+24
Jun  6 10:50:54 FC4 kernel: conntrack_ftp: partial PORT 3112470037+26
Jun  6 11:37:57 FC4 sshd(pam_unix)[3082]: authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=172.27.16.45  user=root
Jun  6 11:38:26 FC4 sshd(pam_unix)[3084]: session opened for user root by root(uid=0)
Jun  6 17:16:40 FC4 sshd(pam_unix)[3112]: session opened for user root by root(uid=0)
Jun  6 17:17:24 FC4 sshd(pam_unix)[3138]: session opened for user root by root(uid=0)
Jun  6 17:20:05 FC4 sshd(pam_unix)[3193]: session opened for user root by root(uid=0)
Jun  7 22:43:22 FC4 sshd(pam_unix)[3221]: session opened for user root by root(uid=0)
Jun  7 22:46:18 FC4 sshd(pam_unix)[3249]: session opened for user root by root(uid=0)
帮看哈是什么问题了。1000M网卡我新换的啊。