Secure network communications between a source computer and a destination computer utilizing a firewall. The firewall determines a remote endpoint and the local physical memory address associated with a local endpoint included in the outbound request. The remote endpoint and the local physical memory address are hashed to generate an index value corresponding to an entry in an internal state table of the firewall. When an inbound request is received, the firewall determines a remote endpoint and the local physical memory address associated with a local endpoint included in the inbound request. The remote endpoint and the local physical memory address of the inbound request are hashed to generate an index value corresponding to an entry in the internal state table of the firewall. The firewall forwards the inbound request to the local endpoint if a matching entry is found in the internal state table at the index value.