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NE40E V800R010C00 Feature Description - NAT and IPv6 Transition 01

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Hairpin Scenario

Hairpin Scenario

Scenario Description

The hairpin scenario is also called NAT loopback, in which two hosts or servers connected to the same NAT device can access each other using a mapped public IP address.

Scenario Example

  • Gateway address:
  • Host 1 address:
  • Host 2 address:
  • Public IP address assigned by the gateway:
  • P2P program P1 run on host 1: private port 23456 mapped to public port 11111
  • P2P program P2 run on host 2: private port 23456 mapped to public port 22222

If a NAT device supports the hairpin scenario, program P1 can access program P2 through Program P2 also accesses program P1 through


  • The hairpin function automatically takes effect (without configuration) when NAT traffic distribution is configured on an inbound interface.
  • The 3-tuple NAT mode must be configured if the public IP address and port number are dynamically assigned to a host in the hairpin scenario.
  • Dual NAT must be configured if hosts to access each other are connected to different NAT devices in the hairpin scenario.
  • The hairpin scenario does not involve mutual access traffic using private IP addresses and without being processed by NAT.
Updated: 2018-07-04

Document ID: EDOC1100027155

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