How to fix the Unicast issue in Vmware

[Eddie_Brown]

Basically any Unicast communications from one VM to another is not being received when they sit on separate hosts. This is true for NLB as well as a new service we have introduced to our network. Dynamics AX AOS clustering. When the AOS servers are on different hosts the performance is severely degraded and the application becomes unusable. Has anyone else come across this type of scenario? VMware has a couple of KB's on it outlining this problem however I would like to get another perspective on this issue.

[Stephane_Grosj1]

When you say "unicast" issue in VMware, are you referring to "unicast NLB mode" (as you are speaking of NLB), or something else? I'm not familiar with AOS Clustering, is it using a similar trick than NLB?

"unicast NLB mode" would result in flooding, this is not efficient, but that should work. What platforms do you use?