[ndnSIM] How to disable the CS cache?

[Chengyu Fan]

Hi

I want to do a experiment with no CS cache. For example, set the freshness
as 0, so the routers would not cache this content.
However, when I check the code, I found that setting the Freshness to 0
means unlimited freshness:

producerHelper.SetAttribute ("Freshness", TimeValue (Seconds (0))); //
unlimited freshness

So is there a way to let routers not cache the content?

Another question: does anyone know how many Attributes we can set? And what
kind of format? Can we add new attributes?

Thanks,
Chengyu
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