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When a packet is sent ?



Hello to all ns comunity,
On my ns scripts, I use a CBR traffic generator above UDP agent.
At the receiver side, I need to know the time at which each packet is
sent.

I looked at  the field "timestamp" in the common header, but
unfortunately UDP doesn't  put in that field the transmission time.

How can I do this ?
I use ns 2.1b5.
Thanks in advance
                        Luca Liberti