Consider the following network:

with this configuration:
*.configurator.config = xml("<config> \
<interface hosts='R2' towards='switch2' address='1.1.1.1' netmask='255.255.255.0' /> \
<interface hosts='**' address='10.x.x.x' netmask='255.x.x.x' /> \
</config>")
The toward attribute does not have any effects. If we use names='eth0' then we get the expected result.