I have many setups using KVM-qemu
i looked at Vmware felt it was pricey. I have used microsoft hyper-v and it works you need more then a few cores for something that normaly on a new amd system required just 1 (I think I gave 3 cores to get asterisk to be happy ) anything network related seemed to be flaky I know there are updates and my linux setups on hyper v seem more stable but I would not spend the money or waste the resources for myself. played with suns virtualbox felt it was a toy and not production ready and that most of it is basically from KVM-Qemu anyway why not go with the real thing. after some playing numerous learning curves I found having a newer kernel helped !

KVM is cheap stable and very effective use of resources. If your want to get stupid fancy you can figure a way to run a good mix of openstack components and cluster a wack of systems together. (I have not found the right mix yet sorta waiting for the dust to settle on the development )

I have some configurations I have tried
I found updating and making a custom kernel with 3.19 for my debian 7 systems with numerous things enabled (I can list if your interested) made the systems more production environment stable. Using Intel Xeon s on some older 2011 servers (Hp proliant, dell ...) and a few 8 core AMD Fx series processor using Gamer type asus motherboards. (with all the virtual machine friendly stuff enabled in the bios.!)
I found I had to give double the cores on the intel machines to get similar performance. Then again the AMD systems are newer.

dual Broadcom gigabyte pci card runing in a bridged mode I had to make sure the proper driver was loaded for the card funny things happened til I got this sorted. Using the e1000 for each network device model. runing 1 pppoe

quad Intel pci card same idea bridged. runing 2 pppoe connections muilti wan seems to do its job as advertised!

I get some odd errors on the syslog but nothing that effects anything.

I had some issues trying to QOS giving me a firewall panic red alert on one network using muiltiwan but I might of added too many rules or something. not sure yet
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Shaun

Yes I do have multiple VM’s running in ESXi including Gateways setup using PPPoE.

In the ESXI world and I am assuming all Virtualisation software have the same approach: the hardware becomes the responsibility of the virtualisation software including the network cards except if you configure your device in passthrough mode.

Now I going to muddy the water a little bit, you can run your setup using one single network card to do all the networking same as what ClearOS allows, network topologies can be complex and many approaches exist to provide your request. I am going to provide what I believe to be the simplest approach and assuming that you have multiple network cards and all are ESXI compliant.

The 101 approach would be to create one ESXI Virtual Switches for each network card that you have and attach it: two networks would equate to building two vSwitch: let say vSwitch0 and vSwitch1. Then all that is left to do is associate the VM network card to the appropriate vSwitch.