[ns] How can i edit the packet header as it passes through routers node in the network?

Hi everybody I am working in a project for packet traceback. And i want to know how to edit specific field in the packet header through its pass in the network by router nodes. Magdy

[ns] Last Week: CFP-IST-AWSN, Ontario, Canada, August 27-29, 2012

  Call For Papers (Apologies for multiple copies) = Intelligent System Techniques for Ad hoc and Wireless Sensor Networks 2012 (IST-AWSN'12) http://cs-conferences.acadiau.ca/ist-awsn12/ will be held in