A system uses gossip messages that are transmitted via multicast to other host server computers to share when new sockets associated with a communication session are established. The gossip message can be used to create an association between a host identifier and an identifier of the communication session. When a network packet arrives, a host server computer can check which host server computer is associated with the communication session. If the communication session is associated with a different host server computer, it encapsulates the packet and transmits the packet to the appropriate host using the pre-computed header template. On the receiving end of this encapsulated packet, a kernel space removes then encapsulation and allows the network packet to be processed by the proper destination host server computer. The result is to ensure all network packets land on the host server computer associated with the communication session.