A method, apparatus, and computer-readable media are presented that provide a configuration for communications through network address translation. The configuration includes receiving, by a computer device, a packet comprising a predetermined value indicating support by a node for an extension of a communications protocol, wherein the communications protocol is used for communications across a network translator device and the extension is capable of traversing network address translation, and in response to said receiving, determining that the node sending the packet supports the extension of the communications protocol.