[ns] How to send a packet to previous node

[howardgod howardgod]

---------- Forwarded message ----------
From: howardgod howardgod <howardgod at gmail.com>
Date: 2008/11/8
Subject: How to send a packet to previous node
To: ns-users at isi.edu


I want to send a packet to previous node. And I don't know how to find
previous node's ID and where to fill the ID.

I found that in common header, there's a prev_hop and next_hop_. But the
prev_hop_ is NOT the previous node. It's the source.

So I want to fill previous node's ID to common header's next_hop_.

And is there anything else I have to fill?

btw I found a way to do so. Reverse the ip header's src and dst then send
it. but It still do nothing at all.

HELP ME!! PLZ

thanks a lot.

                 Howard.