Scope Issue

Hello,
      For Neighbor Discovery messages, is it mandatory that the scope of the 
source and destination address should match?
If i have just a link-local unicast address on a node A connected to another 
node B which has global unicast addresses configured, can i form a ND message 
with source address as link-local unicast address and destination address as 
global unicast address when sending a ND packet from A to B.
 
-- Girish



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