Alexey Melnikov's No Objection on draft-ietf-ipsecme-qr-ikev2-10: (with COMMENT)

Alexey Melnikov has entered the following ballot position for
draft-ietf-ipsecme-qr-ikev2-10: No Objection

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COMMENT:
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Thank you for this document. One small suggestion below:

5.1.  PPK_ID format

   o  PPK_ID_FIXED (2) - in this case the format of the PPK_ID and the
      PPK are fixed octet strings; the remaining bytes of the PPK_ID are
      a configured value.  We assume that there is a fixed mapping
      between PPK_ID and PPK, which is configured locally to both the
      initiator and the responder.  The responder can use the PPK_ID to
      look up the corresponding PPK value.  Not all implementations are
      able to configure arbitrary octet strings; to improve the
      potential interoperability, it is recommended that, in the
      PPK_ID_FIXED case, both the PPK and the PPK_ID strings be limited
      to the base64 character set, namely the 64 characters 0-9, A-Z,
      a-z, + and /.

In order to avoid any doubt, I suggest you make it clear that you mean ASCII
encoding here. For this you should add a normative reference to RFC 20 in the
last quoted sentence.