3.11.5.1 Receiving Message #1

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When the host receives the CFG_REQUEST (as specified in [RFC4306] section 3.15) for the INTERNAL_IP4_SERVER or INTERNAL_IP6_SERVER attribute, it MUST validate the message as also specified in [RFC4306] section 3.15. Additionally, the host SHOULD<31>:

  • See whether the server has an internal IPv4 address or an internal IPv6 address.

  • If either or both are present, add these attributes in CFG_REPLY.

Any failures in this exchange MUST NOT affect the state of the IKE_SA.