On Tuesday, 01/25/2011 at 10:30 EST, Scott Rohling <scott.rohl...@gmail.com> wrote: > I just noticed that the vlan12 device and eth0 use the same MAC address (so > would seem to be the same virtual NIC).. so this setup goes out of the realm of > my experience.. I've used vlan aware vswitch's before, but it was always with > just eth0 on Linux and not the extra 'vlan' device. Just on the surface - I > don't see how anything goes out over vlan12 - but I probably don't understand > the setup well enough to give solid advice. Sorry - meant to help :)
In the post, you saw just "eth0" with two locally-attached subnets. That's called "multinetting" and always indicates a configuration error. (It was dubiously used in old "hub"-style, shared-media networks.) When vconfig is used to assign a VLAN to an interface, it generates a virtual interface e.g. eth0.12. Assign another VLAN and you get another eth0.<vlan> interface. Then you ifconfig the virtual interfaces as you would a real one. But when you do that, the guest must be authorized for PORTTYPE TRUNK and the list of VLANs. If the GRANT doesn't match the guest configuration, nothing will talk. (Just like a real switch.) Alan Altmark z/VM and Linux on System z Consultant IBM System Lab Services and Training ibm.com/systems/services/labservices office: 607.429.3323 alan_altm...@us.ibm.com IBM Endicott
