[Ns-bugs] [Bug 187] Need 'perfect' ARP

[bugzilla-daemon@nsnam-www.ece.gatech.edu]

http://www.nsnam.org/bugzilla/show_bug.cgi?id=187





------- Comment #4 from sam.jansen at gmail.com  2008-05-27 14:55 -------
Answering the "use case" question:

ARP is often an annoyance when doing testing at a higher level. It means the
first packet gets a longer RTT due to the ARP lookup. Often, when doing real
world testing, you just "prime" the ARP cache before doing your testing, to
remove this variability.

Example 1: I just want a "ping" application to measure network RTT. I'm not
interested in another layer having to do ARP here, I just want to know how long
my ping packets take to get through the network. By disabling ARP, we can be
sure that there is no variability introduced by the ARP mechanism.

I don't think ARP interactions are always of interest to a researcher. ns-2
didn't even have such interactions and for many studies, this was fine. It is
often reasonable to study a "steady state" system.


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