In general, the invention is directed to techniques for offloading mobile data traffic from a mobile core network to a broadband network. For example, as described herein, a breakout gateway forwards a service request from a mobile device and addressed to a service node. The service node designates an access point name (APN) for offload such that data traffic associated with service requests specifying the designated APN is to be offloaded to an offload network. The service node receives the service requests from the breakout gateway and, if the service request specifies the designated APN, the service node sends a request to the breakout gateway. The breakout gateway receives the request and assigns a routable PDP address to the mobile device. An offload module on the breakout gateway redirects mobile data traffic to the offload network when the source PDP address of the traffic is the previously assigned PDP address.