[ns] Inserting connectors (NS-2.30)

[toby.moncaster@bt.com]

I am trying to find out how to add a new connector element to a single
link. This element is a dropper. I can add it to every link (which isn't
very useful) but can't manage to add it to a single link.

Thus far I have tried adding the following code to ns-link.tcl:

	SimpleLink instproc insert-drop {dropper} {
		$self instvar ttl_
		$dropper target [$ttl_ target]
		$ttl target $dropper
	}

I have then added an appropriate link in my simulation script using:

	set l1 [$ns simplex-link $n5 $n3 1Mb 5ms DropTail]

I then create a new dropper and try to call the above function using:

	$l1 insert-drop $dropper_

After recompiling everything when I try and run NS I get the error
message

	Invalid command name "_o26 _o46 _o70 _o94"
		while executing
	"$l1 insert-drop $dropper_"


Any idea what I am doing wrong? Is there a better way of doing this?

Toby Moncaster 
Future Communications Architecture 
Networks Research Centre 
BT Group Chief Technology Office 
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