Hello!
Consider the following testing environment: there're two host machines - HOST1 and HOST2 - (Core i5, 16Gb RAM, 3 Nics, one of the nics -HV - is used for test VMs) that host one VM each (now they are "DC" and "EXCH1"). These VMs are connected by the 5-port 1Gb switch UPVEIL.
All operating systems (both for host and virtual machines) are Windows Server 2012R2.
To make sure VM1 can communicate with VM2 I run on VM1 "ping VM2 -t" - there would be NO any packet loss however many minutes/hours thisping continues.
When any action starts that require a bit more network traffic to pass from VM1 to VM2 or vice versa (copying files, connecting to the other VM's Computer Management console...) the network communication stops after several seconds:
After some timeout it resumes and the process of stopping/resuming may be repeated several times or the operation may never be completed at all.
Exactly the same Nics and switch operate perfect when connecting HOSTs (NOT the VMs) - the problem arises ONLY between VMs (Hyper-V).
I did this test many times with different Nics and different switches - no problems exist until the Nics start to get used by Hyper-V.
???
Thank you in advance,
Michael