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NE40E V800R010C00 Feature Description - NAT and IPv6 Transition 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
PCP Public Address and Port Allocation

PCP Public Address and Port Allocation

Allocation Rules

A PCP request originating from a CPE carries a private IP address and port number and a recommended public IP address and port number.
  • If the request does not contain a PREFER_FAILURE Option field, the CGN device allocates the recommended public IP address and port number. If the recommended public IP address and port number are unavailable, the CGN device allocates another public IP address and port number.
  • If the request contains a PREFER_FAILURE Option field, the CGN device returns the error code CANNOT_PROVIDE_EXTERNAL to the CPE. Upon receipt, the CPE has to resend a PCP request for public network resources.

Quantity

A CGN device allocates the following public network resources to each user on CPE:
  • One public IP address and one public port number if a PCP request packet received by the CGN device carries no Port Reservation Option field.
  • One public IP address and two consecutive public port numbers if a PCP request packet carries the Port Reservation Option field. If two consecutive public port numbers are unavailable, the CGN device allocates only one port number to the user and informs the CPE that the other port number fails to be allocated.
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Updated: 2018-07-04

Document ID: EDOC1100027155

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