On 11/13/2015 09:15 AM, Sergio Belkin wrote: > But.... AFAIK, routers divide broadcast domains, and switches (and > therefore bridges) divide collision domains. Oh good, Cisco terminology. :) I'll be more specific than I was earlier, then. It's possible to unify two collision domains into a single broadcast domain with a router, but it's also possible to use a bridge to link collision domains to create a larger broadcast domain. Don't get hung up on that. The comparison of a Linux bridge to a switch is apt. You could, conceptually, connect two PCs to each other using a Linux bridge. You wouldn't, however, connect two ports on one switch (here, the Linux bridge) to two ports on another switch. Doing that creates a loop in your network. Linux Ethernet bridges have several uses, so it's not clear what you're really trying to do. That is, you've said that you're trying to create a virtualized Linux bridge, but a bridge is a tool, not a goal in itself. What do you expect the bridge to do when you've set it up?