@@ -75,8 +75,18 @@ QEMU_CONF=/etc/libvirt/qemu.conf

 # Set default defaults here as some hypervisor drivers override these

 PUBLIC_INTERFACE_DEFAULT=br100

-GUEST_INTERFACE_DEFAULT=eth0

 FLAT_NETWORK_BRIDGE_DEFAULT=br100

+# set the GUEST_INTERFACE_DEFAULT to some interface on the box so that

+# the default isn't completely crazy. This will match eth*, em*, or

+# the new p* interfaces, then basically picks the first

+# alphabetically. It's probably wrong, however it's less wrong than

+# always using 'eth0' which doesn't exist on new Linux distros at all.

+GUEST_INTERFACE_DEFAULT=$(ip link \

+    | grep 'state UP' \

+    | awk '{print $2}' \

+    | sed 's/://' \

+    | grep ^[ep] \

+    | head -1)

 # Get hypervisor configuration

 # ----------------------------