Forgive my ignorance because I don’t use the AIS product and have limited experience with VMware but I think you’d probably have to install AIS on the virtual machines in order to protect them.

I don’t know why avast wouldn’t protect the network connections to the other machines, but I can assume that it’s just because they are virtual interfaces and not real ones.

Since you have Avast installed on the host machine, it would protect your computer from anything trying to come from the virtuals, and obviously wouldn’t allow viruses to go out to the virtuals as well.

So basically, you’re still protected pretty well, and I don’t know if Avast plans on creating NDIS filter drivers for VMWare virtual network adapters or not. Since it’s a software connection and not a hardware one, I don’t even know if it’s possible.

Again, since I have limited knowledge on this I could be wrong. That’s just the way that I think of it being.

Hope it helps in some way.