Ubuntu 14.04. x64. Сервак старый, IBM.
uname -a
Linux router 3.19.0-28-generic #30~14.04.1-Ubuntu SMP Tue Sep 1 09:32:55 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
lspci -knn
03:00.0 PCI bridge [0604]: Broadcom EPB PCI-Express to PCI-X Bridge [1166:0103] (rev c3)
04:00.0 Ethernet controller [0200]: Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet [14e4:164c] (rev 12)
Subsystem: IBM Device [1014:0342]
Kernel driver in use: bnx2
05:00.0 PCI bridge [0604]: Broadcom EPB PCI-Express to PCI-X Bridge [1166:0103] (rev c3)
06:00.0 Ethernet controller [0200]: Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet [14e4:164c] (rev 12)
Subsystem: IBM Device [1014:0342]
Kernel driver in use: bnx2
dmesg
[1754554.633499] bnx2 0000:04:00.0 eth0: NIC Copper Link is Down
[1754606.986451] bnx2 0000:04:00.0 eth0: NIC Copper Link is Up, 1000 Mbps full duplex
[1754606.986461]
[1754681.728189] bnx2 0000:04:00.0 eth0: NIC Copper Link is Down
[1754734.049114] bnx2 0000:04:00.0 eth0: NIC Copper Link is Up, 1000 Mbps full duplex
[1754734.049125]
[1754813.737753] bnx2 0000:04:00.0 eth0: NIC Copper Link is Down
[1754866.270428] bnx2 0000:04:00.0 eth0: NIC Copper Link is Up, 1000 Mbps full duplex
В день несколько раз падает сеть. Куда стоит копать?