They do technically serve separate functions (crosstalk_ip is where the GRE tunnels terminate and as you might want your Openstack-internal network not to be flooded by customer traffic you might want to separate the two) but for 99% of people I don't think the separation is important.
They do technically serve separate functions (crosstalk_ip is where the GRE tunnels terminate and as you might want your Openstack-internal network not to be flooded by customer traffic you might want to separate the two) but for 99% of people I don't think the separation is important.