thanks tathagata and all who answered
effectively I added the path of that directories, but in the wrong form
(e.g., path="c:\cygwin\ns-allinone-2.29" instead of path="/ns-allinone-2.29" 
and similar)

now the more difficult task: understand ns.... ;-)

sergio


>From: "tathagata dasgupta" <[EMAIL PROTECTED]>
>To: "Sergio Torassa" <[EMAIL PROTECTED]>
>Subject: Re: [ns] FW: Re: nam: permission denied
>Date: Fri, 14 Apr 2006 04:01:54 +0530
>
>You need to add(PATH=$PATH:/..) the absolute paths of the directories that
>house the binaries for nam and ns to your path variable.
>for example
>My PATH variable looks like this
>/usr/local/bin:/usr/local/sbin:/sbin:/usr/sbin:/bin:/usr/bin:/usr/bin/X11:/usr/games:/bin/:/usr/sbin:/opt/jdk1.5.0_06/bin:/usr/local/ns-2/ns-
>2.29:/usr/local/ns-2
>
>I had the same problem like yours and chaging it took care
>Hope this helps


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