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Q : how to substitute value of variable?



I will try to make new multicast protocol. but I can't figure out following question.
 
 
Figure.
        node_A -- node_B -- node_C -- node_D
         (agent)     (agent)      (agent)      (agent)
 
 
I'll multicast packet from node_A to node_D  and   change the value of variable in packet header at node_B & node_C using My agent .
but I don't know how to change the value of variable at node_B & node_C.
 
 
thanks..
 
by se-han