On Fri, Dec 25, 2009 at 2:37 PM, Csaba Szip <css...@gmail.com> wrote: > OpenBSD has some network virtualization (not yet fully ready?) stuff > in the tree called rdomain. I reading the current documentation, but i > dont find any solution to interconnect two rdomain. I create two > vether interface in different rdomain and switched them, but it doesnt > work. So that would be nice if this vwire (or similar) device will be > provided and coexist with rdomain.
Hello Csszep, what you need to "glue" rdomains together is _routing_ (combined eventually with some firewalling by pf) which operates at network layer-3 level, based on IP addresses etc. in IP packet headers. The purpose of vwire however is to establish a connection between two bridges which may have ether(4), other pseudo-device such as tunX, and real physical interfaces as members. Thus vwire "glues" together two bridges which become like a large virtual switch with the member interfaces being switch ports. Note that the bridge and the interconnecting vwire operate at link layer-2 exclusively, e.g. we consider _switching_ which looks only at MAC addresses of Ethernet frames. Thus, vwire will not even (need to) be aware of the protocols used by the payload which these switched Ethernet frames encapsulate. vwire will essentially just be bi-directional pipes which transport bits between two bridges. In order to make things interesting, these pipes might introduce some distortion into those bit streams, like loosing occasionally some bits, delay them, etc. vwire will be a link layer-2 device, much like a UTP cables with some "bumps" in it. It will not know anything about IP nor routing network layer-3. Regards, Rolf
