Tunnel Content Inspection
The firewall can inspect the traffic content of cleartext
tunnel protocols without terminating the tunnel:
General Packet Radio Service (GPRS) Tunneling Protocol for
User Data (
GTP-U)
Virtual Extensible Local Area Network (VXLAN) (
RFC 7348)
Tunnel content inspection is for cleartext tunnels, not
for VPN or LSVPN tunnels, which carry encrypted traffic.
You can use tunnel content inspection to enforce Security, DoS
Protection, and QoS policies on traffic in these types of tunnels
and traffic nested within another cleartext tunnel (for example,
a Null Encrypted IPSec tunnel inside a GRE tunnel). You can view
tunnel inspection logs and tunnel activity in the ACC to verify
that tunneled traffic complies with your corporate security and
usage policies.
All firewall models support tunnel content inspection for GRE,
non-encrypted IPSec, and VXLAN protocols. Only
firewalls that support GTP security support
GTP-U tunnel content inspection—see the PAN-OS Releases by Model
that Support GTP and SCTP Security in the
Compatibility Matrix.
