GTP Overview

GTP uses GTPv1-C, GTPv2-C and GTP-U on different types of interfaces.
GTP comprises control plane (GTP-C), user plane (GTP-U), and charging (GTP' derived from GTP-C) traffic transferred on UDP/IP. View the PAN-OS releases by model that support GTP and the 3GPP Technical Standards that GTPv1-C, GTPv2-C, and GTP-U support.
Enabling GTP security on Palo Alto Networks
firewalls allows you to protect the mobile core network infrastructure from malformed GTP packets, denial of service attacks, and out-of-state GTP messages, and also allows you to protect mobile subscribers from spoofed IP packets and overbilling attacks.
The firewall does not currently support GTP Security on S3 and S4 interfaces.
GTPv1-C is defined in 3GPP TS 29.060. It is used on a Gn interface, that is, the interface between GPRS support nodes (GSNs) within a public land mobile network (PLMN), and also across a Gp interface between GSNs in different PLMNs. It is also used for roaming and inter access mobility between Gn/Gp SGSNs and mobility management entities (MMEs). GTPv1-C carries various types of control plane signaling messages. The registered port number for GTPv1-C is 2123.
GTPv2-C is defined in 3GPP TS 29.274. It is used on various EPC (Evolved Packet Core) signaling interfaces, such as S5, S8, and S11. GTPv2-C carries various types of control plane signaling messages. The registered port number for GTPv2-C is 2123.
GTP-U is defined in 3GPP TS 29.281. It encapsulates and routes user plane traffic across multiple signaling interfaces such as S1, S5, and S8. GTP-U messages are either user plane or signaling messages. The registered port number for GTP-U is 2152.
NAT is not supported for GTP tunnel IP addresses with GTP stateful inspection.
By default, PA-7000 Series firewalls with PA-7000-100G-NPC-A and PA-7050-SMC-B or PA-7080-SMC-B perform tunnel acceleration to improve performance and throughput for traffic going through GRE, VXLAN, and GTP-U tunnels. Tunnel acceleration provides hardware offloading to reduce the time it takes to perform flow lookups and allows the tunnel traffic to be distributed more efficiently based on the inner traffic. You can Disable Tunnel Acceleration for ease of troubleshooting.

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