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Is the interface ID option in an IPv6CP conf-req required?


Yes.  Per RFC 5072, IPv6 over PPP, it says in section 4.1:

   4.1.  Interface Identifier
      This Configuration Option provides a way to negotiate a unique, 64-
      bit interface identifier to be used for the address autoconfiguration
      [3] at the local end of the link (see Section 5).  A Configure-
      Request MUST contain exactly one instance of the interface-identifier
      option [1].  The interface identifier MUST be unique within the PPP
      link; i.e., upon completion of the negotiation, different interface-
      identifier values are to be selected for the ends of the PPP link.
      The interface identifier may also be unique over a broader scope.

Product : Access,PPPoX,PPP,IPv6