Systems and methods are disclosed for providing a hierarchy of appliances to access resources across branch offices. A method comprises: establishing, by a first aggregator appliance, connections with a first plurality of branch office appliances; establishing, by a second aggregator appliance, connections with a second plurality of branch office appliances, the first plurality not having information identifying the second plurality; receiving, by the first aggregator appliance, from a first branch office appliance a request from a client for access to a resource; identifying, by the first aggregator appliance via the second aggregator appliance, a second branch office appliance from the second plurality to service the request; transmitting, by the first aggregator appliance, to the first branch office appliance information identifying the second branch office appliance; and establishing, by the first branch office appliance, a connection with the second branch office appliance. Corresponding systems are also described.