We can check for for packet loss at the hardware level using ethtool:
ethtool -S eth0
Typically (although can vary) you are looking for a counter such as:
rx_*_errors
When the packets are received from the NIC they are then placed into send and receive queues - we should ensure that none of them are currently full - we can view these with:
ss -nmp
and finally check for protocol errors with netstat:
netstat -s
Sources
https://access.redhat.com/sites/default/files/attachments/20150325_network_performance_tuning.pdf
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