Hello,
I've just resigned from the company I was working for, but there, every single VLAN is firewalled and yes, this includes all internal VLAN's. So my SC can't talk to my VMK unless it is explicitly allowed by firewall rules. It's very ugly on initial setup, but doesn't cause me grief.
Well within the vNetwork that firewall has absolutely no effect if:
a: SC and vMotion share the same vSwitch
b: Promiscuous mode is allowed. (reject is the default, but for some reasons people change this)
c: They are on the same subnet....
No way to place a firewall between the SC and vmkernel devices without some form of physical separation which forces things to be on separate vSwitches. Then you get to that point... I am actually gathering together all the hacks/attacks that can affect a virtual environment and so far I have been surprised by the MiTM possibilities.... Even without promiscuous mode adapters.....
I like physical separation because I tend not to trust anyone outside the administrative staff, considering that 70% of the attacks come from inside, can you afford to trust anyone? Even in the administrative staff we restrict rights whenever necessary.
Physical separation of the networks is the only defense against promiscuous mode ethernet adapters and while by default they are not allowed, there are quite a few security products out there that actually require this to be setup. Once it is setup for one portgroup, it is very very easy to drop a system on that network and now I have access to everything I should not. Defense: use physical separation where ever possible and monitor my configuration for such changes. I look over the network configuration pretty regularly.
I still think that load balacing requires like ethernet adapters, while failover does not.... But not sure, I tend to always match them up out of practice.
They say the book is on schedule! I will be writing more blogs on this subject as I find free time.
Best regards,
Edward L. Haletky, author of the forthcoming 'VMWare ESX Server in the Enterprise: Planning and Securing Virtualization Servers', publishing January 2008, (c) 2008 Pearson Education. Available on Rough Cuts at
http://safari.informit.com/9780132302074