What are the un utilized fields of ns2 packet header or the packet class?

Tag: networking , packet , ns2 Author: leilei1213 Date: 2014-02-09

I would like to ask if there is any optional fields or un utilized fields in the packet header of ns2 software. I want to attach my data in any untilized fields of ns2 packet header in order to make it accessible by the whole classes in ns2.XX folder. So is there any such optional fields that the ns2 developer consider it for future use or fields are utilized but not fully utilized or fields that if they have been overwritten, it will not cause any problems with ns2? I have a deeper look at ns2 documentation but I don't find what I need. Any suggestions??

for more details you will find the packet class and the packet header in the following links:

The packet class: http://www.isi.edu/nsnam/ns/doc/node132.html

The hdr_cmn Class: http://www.isi.edu/nsnam/ns/doc/node134.html

Thanks for your help in advance.