A method and system for transporting packets between an access node and a core node via a proxy node. The access node has an access node address, the core node has a core node address, and the proxy node has a proxy node address. A first packet for transmission to the core node is received from the access node. The first packet includes a first source address field including the access node address and a first destination address field including the core node address. An uplink static mapping entry with a longest address prefix matching the access node address in the first source address field is selected. The uplink static mapping entry is associated with the proxy node address. The access node address in the first source address field is replaced with the proxy node address associated with the uplink static mapping entry.