I wanted to set up a VM running Ubuntu that could watch traffic involving other VMs. I’m working on a new TCP/IP Weapons School 2.0 class. The problem is that modern versions of VMware Server (I run 1.0.8 now) act as switches and hubs not hubs. I want to distribute ato the students that was running and capturing the traffic using Sguil and other tools. I also want to see the traffic on the server itself, even though it is not listed by the VMnet0.”]
Source: https://taosecurity.blogspot.com/2008/12/nsm-friendly-vmware-lab-setup.html