Before starting to understand how Trellix IPS works in conjunction with GTP, following are few terminologies which will help understand the feature better:
General Packet Radio Service (GPRS) — This is packet-oriented mobile data service which uses either second generation (2G) or third generation (3G) cellular communication to transmit data on the system’s GSM, UMTS and LTE networks.
Global System for Mobile communication (GSM) — This is a standard used to describe protocols for 2G and 3G cellular networks used by mobile phones.
Universal Mobile Telecommunications System (UMTS) — This is a GSM based standard for the third generation mobile cellular network that includes authentication of users through SIM cards.
Long-Term Evolution (LTE) — This is a standard for high speed data for mobiles and data terminals based on wireless communication.
Gateway GPRS Support Nodes (GGSN) — The GGSN is used for internetworking between the GPRS and external packet switched networks.
Serving GPRS Support Nodes (SGSN) — The SGSN is responsible for delivery of data packets to and from the mobile stations within the mapped geographical service area.
GTP user data tunneling (GTP-U) — This is an IP based tunneling protocol used by GTP for carrying user data between the SGSN and GGSN.
GTP Control (GTP-C) — This is used within the GPRS core network for signaling between GGSN and SGSN.
GTP version 1 (GTPV1) — GTP uses the sub-protocols, GTP-C and GTP-U for communication. GTPV1 uses only UDP for communication. It uses port 2152 for communication and transmitting data.
Gn — This is an IP based interface between SGSNs, other SGSNs and internal GGSNs (in the same geographical location, when not in roaming).
Gp — This is an IP based interface between internal SGSN and external GGSN (when the network is in roaming).
Gi — This is an IP based interface between the GGSN and Public Data Network (PDN) directly to the internet or through a WAP gateway.
Internet Protocol Security (IPsec) — This is a protocol used for securing and authenticating each IP packet during communication.
Layer 2 Tunneling Protocol (L2TP) — This is a tunneling protocol to support virtual private networks.
Point-to-Point Protocol (PPP) — This is a data link protocol used to establish direct connection in physical networks.