dell R410网线松动故障
首先发现是在线人数掉线了，之后定位到这台机器，一看message信息吓一跳赶紧联系机房看下网卡的灯和网线情况，发现确是网线松动导致的。
bnx2: eth0 NIC Copper Link is Up, 1000 Mbps full duplex, receive & transmit flow control ON
bnx2: eth0 NIC Copper Link is Down
bnx2: eth0 NIC Copper Link is Up, 1000 Mbps full duplex, receive & transmit flow control ON
bnx2: eth0 NIC Copper Link is Down
Jun 10 17:34:51 192 kernel: bnx2: eth0 NIC Copper Link is Up, 1000 Mbps full duplex, receive & transmit flow control ON
Jun 10 17:34:57 192 kernel: bnx2: eth0 NIC Copper Link is Up, 1000 Mbps full duplex, receive & transmit flow control ON
Jun 10 18:33:04 192 kernel: bnx2: eth0 NIC Copper Link is Up, 1000 Mbps full duplex, receive & transmit flow control ON
Jun 10 18:33:46 192 kernel: bnx2: eth0 NIC Copper Link is Up, 1000 Mbps full duplex, receive & transmit flow control ON
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