[ns] Error while setting RXThresh_ &CSThresh_

[Saikat Ray]

NS actually does not use randomized errors. You will deterministically see either (i) all packets are getting through, or (ii) no packets are getting through. Since you changed the threshold, you are seeing (ii). In other words, because you changed the threshold values, the "ranges" are now different and
your nodes are no longer within the hearing range of each other.

You can quite easily introduce random errors, but you need to modify the code for doing that (quite simple modifications).


----------- Original Message ---------

DATE: Tue, 24 Feb 2004 14:33:09
From: Bhaskar Anepu <mobnets at yahoo.com>
To: ns-users at ISI.EDU
Cc: 

>
>Hi,
>
>I'm using the 802.11 implementation in NS version
>2.1b9a.
>By Default (ns-default.tcl),  RXThresh_ = 3.652e-11;
>CSThresh_ = 1.559e-10 ;
>I want to raise the values of these thresholds to the
>order of e-6, so that I can see more packet errors. 
>I'm using Propagation/TwoRayGround
>
>But then, I get the following message repeatedly: 
>Warning: Route to base_stn not known: dropping pkt
>
>None of the packets sent reach the destination node,
>and TCP throughput drops to zero.   
>
>Could you please help me solve this problem ? 
>
>Thanks,
>Sumathi
>
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