Comment 8 for bug 1620622

Please be informed that both admin and public networks are untagged (not vlan interfaces) and they can not be assigned to the same interface. So, at least two physical interfaces are needed on slave nodes. One for admin network and another for public network (other networks like management, storage, etc. could be assigned on vlan interfaces). Fuel network manager component automatically assigns public and admin networks on different interfaces.

There are two types of repository checks from slave nodes
1) via master node (admin network)
2) via public gateway (public network)

When 1), there won't be any additional configuration on slave nodes. It is assumed Fuel master node is used as a gateway. By default it is 10.20.0.2 (172.25.10.2 for this particular case).

When 2), public interface (which is in down mode by default when a node in bootstrap) is configured TEMPORARILY (public ip is assigned and public gateway is configured as default). It is important that this public gateway which is 172.16.0.1 by default (193.1.202.1 for this particular case) MUST be working (it is not on the master node).

I attached a small sketch to the bug to exaplain all this stuff, but if you need details please refer to http://docs.openstack.org/developer/fuel-docs/