[ns] dynamic link and/or bandwidth

[Pendzick, John N.]

Can NS support dynamic changes in a links bandwidth and/or link delay?  
Seems like just getting the link and redefining the link delay or 
bandwidth at a specific time doesn't change the value...(example below)

$ns duplex-link $n0 $n1 10Mb 10ms DropTail
set link [$ns link $n0 $n1]
$ns at 2.0 "$link set delay 1ms"

Can Nam support the visualization of this change to the bandwidth or 
link delay?  Can NS itself do support it?
If not where in the C code is the delay and bandwidth being set and used 
to define the propogation delay of a packet going between point A and 
point B?

Anybody have a better idea of how to achive this goal then hacking the 
source code?  Is there a package out there that is already written to 
support this change in bandwidth and/or link delay?

John Pendzick
john.pendzick at ngc.com