I have done a bandwidth test between two Router Board 750 GL (ROUTER OS 6.7) during 60 seconds. I have checked that a lot of packets have been lost during the test but when the test is finished it shows Lost packets=0. Why it does not show the total packet lost?

/tool bandwidth-test 40.1.1.1 duration=60s direction=both local-udp-tx-size=1500 protocol=udp remote-udp-tx-size=1500 user=1234 password=1234 local-tx-speed=40M remote-tx-speed=40M

status: done testing
duration: 60s
tx-current: 39.9Mbps
tx-10-second-average: 39.9Mbps
tx-total-average: 39.9Mbps
rx-current: 39.9Mbps
rx-10-second-average: 39.7Mbps
rx-total-average: 39.7Mbps
lost-packets: 0
random-data: no
direction: both
tx-size: 1500
rx-size: 1500

How Is it posible to know how many packets have been lost during the test?

Thanks in advandec

So you are pushing 40Mbps each direction, but what is the size of the pipe you are traversing?

The problem is not the pipe because I have connect with a straight cable. I am working in my desk before going to the customer. The problem is that packets have been lost during the band with test but when the test is finished it shows 0 PACKETS. Why it does not show all the packets that have been lost during the test?

whats to say packets are actually being dropped? Is it possible that all packets were sent/received?

Isn't possible that dropped packets were sent again so they weren't lost by the costs of lower measured bandwidth?

How are you proving that packets are lost?
You are pushing 40Mbps through a 1,000Mbps pipe, direct connected. I would be surprised if you were losing packets at all. You are testing UDP, but you are NOT pushing 110% of the pipe, so you shouldn't see any dropped packets at all.

It is very easy to drop packets because I remove the Ethernet cable during 3 seconds aprox. and once I connect it again the packet lost it shows 10.000 packes lost (for example), and when the test finishs it shows 0 packet LOST, how is it posible it shows 0 packe lost if during the test it has been lost 10.000 packets as mínimum.