What is GTP U (GPRS Tunneling Protocol in user plane)?

The GTP tunnel comprises the GTP control plane (GTP-C) and GTP user plane (GTP-U). GTP-U tunnel is utilized to embody and route the user plane traffic across different signaling interfaces. The GPRS tunneling protocol user plane (GTP-U) is utilized to inspect security on GTP-U packets. At the point when GTP-U inspection is empowered, the invalid GTP-U packets are blocked and the GPRS support node (GSN) is shielded from a GTP-U attack.