Re: [ns] NS & NAM Difficulty in Visualaztion of Greis' Wireless Examples

[John Mehringer <mehringe@ISI.EDU>]

Hi Raju,

There were some visualization problems especially with wireless data in nam 1.0a9.  Those
have been fixed in the daily snapshot which you can get from
http://www.isi.edu/nsnam/nam/index.html and compile yourself.

Those bug fixes will be going into nam 1.0a10 which will probably be released sometime in
the middle of June if you want to wait.

- John Mehringer


Raju Mansukhlal Shah wrote:

> Hello,
>
> I am working on a wireless project with a few others, and we are in the
> process of thoroughly understanding Greis' examples and have run into a
> few snags.
>
> I am working on a Windows NT platform and I am using NS 2.1b7 and NAM
> 1.0a9.
>
> My teammember is working on a Sun Solaris 5.6 using NS 2.1b6 and NAM
> 1.0a8.
>
> He is also working on a Red Hat (Wolverine - 7.09) Linux using NS 2.1b7a
> and NAM 1.0a9.
>
> My *.nam is
>
> W -t * -x 670 -y 670
> n -t * -s 0  -x 83.364418416244007 -y 239.43800983126101 -Z 0 -z 20  -v circle -c black
> n -t * -s 1  -x 257.04629832315698 -y 345.35773177920402 -Z 0 -z 20  -v circle -c black
> n -t * -s 2  -x 591.25656009383295 -y 199.37330681680399 -Z 0 -z 20  -v circle -c black
> V -t * -v 1.0a5 -a 0
> A -t * -n 1 -p 0 -o 0xffffffff -c 31 -a 1
> A -t * -h 1 -m 2147483647 -s 0
> n -t 33.000000 -s 0 -x 83.364418 -y 239.438010 -u 2.711074 -v 18.960996 -T 2.323540
> n -t 50.000000 -s 2 -x 591.256560 -y 199.373307 -u -3.343610 -v -0.434985 -T 66.333489
> n -t 51.000000 -s 1 -x 257.046298 -y 345.357732 -u -1.967869 -v -14.778819 -T 17.897386
> + -t 127.936679222 -s 0 -d -1 -p cbr -e 512 -c 2 -a 0 -i 0 -k AGT
>
> My teammember's *.nam from his Sun Solaris 5.6 is
>
> W -t * -x 670 -y 670
> n -t * -s 0  -x 83.364418416244007 -y 239.43800983126101 -Z 0 -z 20  -v circle -c black
> n -t * -s 1  -x 257.04629832315698 -y 345.35773177920402 -Z 0 -z 20  -v circle -c black
> n -t * -s 2  -x 591.25656009383295 -y 199.37330681680399 -Z 0 -z 20  -v circle -c black
> V -t * -v 1.0a5 -a 0
> A -t * -n 1 -p 0 -o 0xffffffff -c 31 -a 1
> A -t * -h 1 -m 2147483647 -s 0
> n -t 33.000000 -s 0 -x 83.364418 -y 239.438010 -u 2.711074 -v 18.960996 -T 0.046550
> n -t 50.000000 -s 2 -x 591.256560 -y 199.373307 -u -3.343610 -v -0.434985 -T 66.333489
> n -t 51.000000 -s 1 -x 257.046298 -y 345.357732 -u -1.967869 -v -14.778819 -T 0.311796
> + -t 127.936679222 -s 0 -d -1 -p cbr -e 512 -c 2 -a 0 -i 0 -k AGT
>
> The start of his *.nam from the Laptop is identical to mine (we didn't
> compare the rest of the files)
>
> Using a back of the envelope approach the numbers from my simulation seem
> correct.  Thus, this seems to be an undocumented problem with NS version
> 2.1b6, in that the time duration that a node is in transit is incorrect.
>
> However, when trying to visualize the nam file we noticed some
> irregularites.  When we ran my nam file with NAM v1.0a8, we would see
> circles raidate from nodes, representing packets.  Running the same nam
> file with NAM v1.0a9, we don't see any packets transmitted.
>
> When we ran his nam file produced from NS 2.1b6, the packets were
> transmitted as though there were hard wire links between the nodes.  When
> we ran his laptop output we again so nothing being transmitted between
> nodes.
>
> While it seems that the Time duration of travel has been fixed from NS
> 2.1b6 to 2.1b7, the Visualization aspect of packet flow has been dropped
> from NAM 1.0a8 to 1.0a9.  Will this feature be returning in the next
> installment of NAM or is there a fix that we can do ourselves?
>
> Thanks
>
> raju