Cisco ASA 5506-X Configuration Manual page 241

Chapter 10 Inspection for Management Application Protocols
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GTP Inspection Overview
GPRS provides uninterrupted connectivity for mobile subscribers between GSM networks and corporate
networks or the Internet. The GGSN is the interface between the GPRS wireless data network and other
networks. The SGSN performs mobility, data session management, and data compression.
Figure 10-1
The UMTS is the commercial convergence of fixed-line telephony, mobile, Internet and computer
technology. UTRAN is the networking protocol used for implementing wireless networks in this system.
GTP allows multi-protocol packets to be tunneled through a UMTS/GPRS backbone between a GGSN,
an SGSN and the UTRAN.
GTP does not include any inherent security or encryption of user data, but using GTP with the ASA helps
protect your network against these risks.
The SGSN is logically connected to a GGSN using GTP. GTP allows multiprotocol packets to be
tunneled through the GPRS backbone between GSNs. GTP provides a tunnel control and management
protocol that allows the SGSN to provide GPRS network access for a mobile station by creating,
modifying, and deleting tunnels. GTP uses a tunneling mechanism to provide a service for carrying user
data packets.
Note When using GTP with failover, if a GTP connection is established and the active unit fails before data
is transmitted over the tunnel, the GTP data connection (with a "j" flag set) is not replicated to the
standby unit. This occurs because the active unit does not replicate embryonic connections to the standby
unit.
GTP Inspection Overview, page 10-5
Defaults for GTP Inspection, page 10-6
Configure GTP Inspection, page 10-6
Verifying and Monitoring GTP Inspection, page 10-10
GPRS Tunneling Protocol
Home PLMN
MS
SGSN
Roaming partner
(visited PLMN)
Internet
Gn
Corporate
GGSN Gi
network 2
Gp
Corporate
network 1
GRX
Cisco ASA Series Firewall CLI Configuration Guide
GTP Inspection
10-5