Re: [ns] changing target at the classifier!

[Sowmya Manjanatha <sowmyam@mars.iol.unh.edu>]

Thanks for the suggestion Debo.  

Getting a packet of my choice is not a problem since I can do this at 
the Classifier::recv function itself.  But how wd. you invoke one of 
the send functions in Classifier ? Is there a possibility of finding 
the previous object on my path from the  classifier so that I can 
atleast pass back the packet there.  In my case, the previous object 
of the destination classifier is always a connector. So, I can invoke 
the send function at the connector.

I tried another way and wasn't very successful either.  Here it goes

     ---------------------------------------------
                   DEST   NODE 

      classifier ------> MyAgent -------> DestAgent

     -----------------------------------------------


I tried to attach my own agent to the destination node and then made the
actual destination agent as a target for MyAgent. Something as below :


$ns attach-agent $dest_node $myagent
$myagent target $dest_agent

This dumped the following error:

--- Classfier::no-slot{} default handler (tcl/lib/ns-lib.tcl) ---
	_o17: no target for slot -1
	_o17 type: Classifier/Hash/Dest
content dump:
classifier _o17
	0 offset
	0 shift
	2147483647 mask
	3 slots
		slot 0: _o24
		slot 1: _o71
		slot 2: _o24
	-1 default
---------- Finished standard no-slot{} default handler ----------


My only requirement is that I want to be able to intercept the packet of
my choice before it reaches the destination agent and send it back.

Any kind of a hint to achieve this will help.

Thanks,
Sowmya.


*******************************************************************************

    Sowmya Manjanatha : University of New Hampshire
    Major             : Computer Science      
    *********************************************** 

    email        : sowmyam@cs.unh.edu

*******************************************************************************

On Fri, 16 Feb 2001, Debojyoti Dutta wrote:

> One suggestion would be to see whether you can change the classify
> function and once you get the packet of your choice, you can do what you
> want.
> 
> Cheers
> Debo
> 
> On Thu, 15 Feb 2001, Sowmya Manjanatha wrote:
> 
> > 
> > Hi all,
> > 
> > In one of my research works,  I would want to be able to provide some
> > feedback from a destination to the sender of a particular incoming 
> > packet similar to TCP ACKS except that I want to do it at the classifier
> > level.  The classifier does not hold the "target_" variable like the
> > Connector or NSObject.  The classifier is neither derived from one of
> > the Objects that hold this variable.  So, what would be the best way
> > to send back a message from the classifier to the sender.
> > 
> > Any hints, suggestions will be greatly appreciated.
> > 
> > Thanks,
> > Sowmya.
> > 
> > 
> > 
> > *******************************************************************************
> > 
> >     Sowmya Manjanatha : University of New Hampshire
> >     Major             : Computer Science      
> >     *********************************************** 
> > 
> >     email        : sowmyam@cs.unh.edu
> > 
> > *******************************************************************************
> > 
> > 
>