Abstract: A method and system for learning network information through a plurality of network devices is provided. The plurality of network devices are configured for IPsec. The method enables negotiation between the network devices to set up a security association and provide network information between the configured network devices. This network information includes a plurality of sub-network routes.

Abstract: A method, system, and computer program product for dynamically updating a routing table in a virtual private network including a concentrator with a routing table and one or more security associations is provided. A change is identified in the virtual private network, and related network information is also identified. A notification update message is created, including (i) a type of change to be made to the routing table based on to the identified change and (ii) the related network information. The notification update message is sent to the concentrator, which updates the routing table according to the notification update message. During the updating of the routing table of the concentrator, current security associations of the virtual private network tunnel are maintained.