the machines you are trying to access are not on VLAN 9 (or 10) and
that the Internet is not available on VLAN 9 (or 10).
+Q: I added a pair of VMs on the same VLAN, like this:
+
+ ovs-vsctl add-br br0
+ ovs-vsctl add-port br0 eth0
+ ovs-vsctl add-port br0 tap0 tag=9
+ ovs-vsctl add-port br0 tap1 tag=9
+
+ The VMs can access each other, but not the external network or the
+ Internet.
+
+A: It seems likely that the machines you are trying to access in the
+ external network are not on VLAN 9 and that the Internet is not
+ available on VLAN 9. Also, ensure VLAN 9 is set up as an allowed
+ trunk VLAN on the upstream switch port to which eth0 is connected.
+
Q: Can I configure an IP address on a VLAN?
A: Yes. Use an "internal port" configured as an access port. For