the created mapping will last. See also DMZ (computing) a subnetwork that contains and exposes one's external-facing services to a larger and untrusted network Hole punching (networking) establishing direct connections between two networked parties residing behind firewalls or NAT-enabled routers Universal Plug and Play Internet Gateway Device Protocol References External links Port Control Protocol (PCP): Related documents (IETF) Port Control Protocol (PCP): Charter for Working Group (IETF) Internet architecture Internet protocols Network address translation Network protocols