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[ns] Changing Packet header fields




Hi,
  I am trying to test the mapping of IS to DS,I need to add the DSCP code to packet header at the boundary node.How can implement this in the tcl code.I am not at all familiar with the tcl language.Can I access the header of packet from the tcl code?Where(which function) to add the command function for adding any field to the header field?
Thankx so much for any little help or suggestion
Jyotsna


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