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Pallavi, NS2's documentation on packet headers can be found here <http://www.isi.edu/nsnam/ns/doc/node127.html>. Beyond this I would recommend reviewing current Aqua-Sim protocols, such as broadcastMAC, to gather a stronger understanding of how they are accessed and used. Additionally, reference packet header file to review some of the basic principles of hdr_cmn. -Robert On Wed, May 18, 2016 at 6:42 AM, pallavi ganganna <[log in to unmask] > wrote: > How to define the packet headers?please anyone help > > On Tue, May 17, 2016 at 9:25 PM, Lina Pu <[log in to unmask]> wrote: > >> Hi Sana, >> >> >> >> Yes, you can do it in Aqua-Sim. What you need is to modify the >> corresponding .cc source file and recompile the package. As long as the >> information is included in the packet header, you will be able to read it, >> save it to the file or do any operation you like. If the information you >> need is not included in the header of any layers, you can add it to the >> appropriate layer (MAC, Routing or TCP) by modifying the .h file. >> >> >> >> Hope it helps. >> >> >> >> Thanks, >> >> Lina >> >> >> >> *From:* Mailing list of Aqua-Sim, an Underwater Sensor Network Simulator >> [mailto:[log in to unmask]] *On Behalf Of *Sana Shaikh >> *Sent:* Tuesday, May 17, 2016 7:15 AM >> *To:* [log in to unmask] >> *Subject:* UnderwaterSink methods >> >> >> >> Is there any way to perform a specific function on the packet received by >> the sink >> >> while simulating not from trace file. >> >> For example, Sink receives a TCP packet , now I want it(sink) to extract >> the node id from the packet and save it and perform some function on it. >> >> So, is it possible with Aqua-Sim ?? >> >> >> > >