Re: [libvirt-users] Guests can't connect to each other

Your config looks fine (the important part is that you're using bridge mode for macvatap rather than private). I would suspect some sort of bug related to using macvtap on a vlan device (or, even more, a vlan connected to a bond). Try changing your network config to use 1) a vlan connected directly to eth0 or eth1, rather than the bond, 2) bond0 directly, and 3) eth0 or eth1 directly. This will hopefully give you an idea of which part of the equation isn't working.