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9-10
Cisco IOS XE Integrated Session Border Controller Configuration Guide for the Cisco ASR 1000 Series Aggregation Services Routers
OL-15421-01
Chapter 9 Topology Hiding
No NAPT Pinholes
• A hairpin of two pinholes in which both external terminations are provisioned with the NAT latching
instruction cannot latch and cannot forward media. No NAPT pinholes are not allowed to (re)latch
to the remote addresses on both sides.
• IPv6 hairpinning are supported on UDP and TCP.
• Coupling of Single NAPT pinholes is not supported.