Добрый день.
В логах все время вижу такое с периодом меньше минуты:
# tail -n 70 /var/log/syslog | grep kernel
Oct 2 12:12:20 SRV kernel: [ 823.008244] r8169 0000:00:0c.0: eth1: link up
Oct 2 12:13:02 SRV kernel: [ 865.008236] r8169 0000:00:0c.0: eth1: link up
Oct 2 12:13:56 SRV kernel: [ 919.008242] r8169 0000:00:0c.0: eth1: link up
Oct 2 12:14:33 SRV kernel: [ 955.008235] r8169 0000:00:0c.0: eth1: link up
Oct 2 12:14:51 SRV kernel: [ 973.008240] r8169 0000:00:0c.0: eth1: link up
Oct 2 12:15:21 SRV kernel: [ 1003.008238] r8169 0000:00:0c.0: eth1: link up
Oct 2 12:15:33 SRV kernel: [ 1015.008240] r8169 0000:00:0c.0: eth1: link up
Oct 2 12:16:51 SRV kernel: [ 1093.008240] r8169 0000:00:0c.0: eth1: link up