[ns] how to send a packet from one agent to another

[Xiaojun Hei <heixj@ee.ust.hk>]

Dear Ns users

I want to use an Agent to generate a packet and set its destiniation
address and port number,  then use target_->recv(pkt) to send it out,
but it turns out that Classifier/Hash/Dest cannot route the packet to
the destination.

--- Classfier::no-slot{} default handler (tcl/lib/ns-lib.tcl) ---
        _o28: no target for slot -1
        _o28 type: Classifier/Hash/Dest
content dump:
classifier _o28
        0 offset
        0 shift
        2147483647 mask
        1 slots
                slot 2: _o384 (Classifier/Port)
        -1 default
---------- Finished standard no-slot{} default handler ----------

What have I missed?  Shall I do some configurations in my script in
order to let Classifier/Hash/Dest know the route?

thanks for your help.

sean