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[ns] link handles
I am trying to vary a link's bandwidth and delay dynamically. I came
across Sally Floyd's email
(http://www-mash.CS.Berkeley.EDU/dist/archive/ns-users/0005/0409.html) about
her changes to ns which allow this, but only after trying lots of stuff
with links.
This brought up a question about whether the info in the ns manual,
chapter 6.4, is
correct. It gives a list of commands that begin with "$ns_". That seems
to work. But it also lists commands like "$link up?".
I can't get those to work. How do you get a handle to a link object? I
wrote:
set newlink [$ns duplex-link $n1 $n2 1Mb 10ms DropTail]
But then the command "$newlink up?" fails. The failure message is:
invalid command name ""
while executing
"$newlink up?"
And when I write: "puts stdout $newlink", I just get a blank line, as if
no handle to the link between $n1 and $n2 exists. So how do you get a
handle for a link? Or, what does "$link" refer to in chapter 6.4?
--Pat.
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Patrick Simen
[email protected]
EECS Dept.
University of Michigan
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