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Using duplex links with LAN




hi,
   
    i m using ns-2.1b6-current.
    i seem to encounter problems when i try to connect duplex links with
LAN, for e.g 

    A ----- B ------ C ------ D  
  
     where A and B are connected using duplex link 
               B and C are connected using LAN
              and C and D are connected using duplex link.

     i establish a TCP connection from A to D and start a FTP session.
However, packets only
flow from B to C. Packets did not originate from A.

     can anyone advise ?

rgds,
kwang mien