Many dropped packets of my NIC

couple of things to check:

run ethtool eth0 and see what speed/duplex status you have on the interface, then check if switch on the port you connect your server to has the same settins [ expected are: full duplex, 100 or 1000 MBit/s. identical on both sides ]
if there is no duplex missmatch - check the switch port and the network interface - maybe one of them is faulty
check / replace the patch-cord, maybe it is faulty or goes along some source of interference

which network card are you using it is normally do with driver u can re install them

uname -a
lspci |grep Ethernet
dmesg |grep eth0
ethtool eth0
ethtool -k eth0
ethtool -S eth0

take the out put of this and post back

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