Subject: [MMUSIC] ABNF for RFC 4566 is not Clear

From: Avinash <[email-masked]>
Date: Tue, 10 Nov 2009 18:58:06 +0530

Hi ,
 
  As per RFC 4566 following are ABNF grammar for IP6 unicast adresses 
 
  IP6 Unicast Adress
   IP6-address =         hexpart [ ":" IP4-address ]
 
   hexpart =             hexseq / hexseq "::" [ hexseq ] /
                         "::" [ hexseq ]
 
   hexseq  =             hex4 *( ":" hex4)
 
   hex4    =             1*4HEXDIG

   HEXDIG         =  DIGIT / "A" / "B" / "C" / "D" / "E" / "F"

   IP6-multicast  address starts with FF  but there is no mention about the
boundary in IP6-unicast adress definition unlike IP4 unicast adress which
clearly  mentions the upper boundary 
 
Though the adress "FF01:0:0:0:0:0:0:1" is IP6 multicast adress it is allowed
as IP6 unicast adress as per ABNF of  RFC 4566 
 
IP6 Unicast adress like -> FEC0::/48 cannot be accomidated with the above
definition as there is no mention of "/" in IP6 unicast adress 
 
Iam not clear about the IP6 unicast ABNF adress definition could you please
clarify me about the same 
 
Thanks and Regards,
Avinash Koneru