r/gns3

I made a MPLS lab on gns3 where it has the topology as such. the router i used is iso Cisco c7200 , i connected the first cloud to host device through loopback interface, the other cloud connected to Ubuntu machine on VMware through VMnet2 virtual interface.

The ping test was successful between the two devices and there's no packet loss, but when i tried to make Iperf3 test with 10 samples of packet bursts (from 1 to 10 mbps) the output shows that there's a **99% packet loss** with 1.2 ms latency.

The routers configuration is correct and working as it should be so i don't think its a configuration related problem more than cloud interfaces problem.

has anyone came through problem like this and if anyone could help please?

Thanks in advance.