Trouble With Animation of Simplex Links.

[Darren Kressaty]

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There seems to be some trouble running the latest copy of nam and having
it display simplex links in the GUI. They don't show up at all. Is this
a known bug or do I have something configured incorrectly?

When I change the links to duplex they show up as nice, thick, dark
lines connecting the nodes in question. Using simplex links, there is no
graphical connection at all.

FYI I am running under the latest release of Red Hat Linux.

Please find attached a copy of the .tcl file used to reproduce this
problem.

--
Darren M. Kressaty
Renaissance Engineer
Minerva Engineering
Phone: 602-732-4791
Fax:   602-732-3541
darren_kressaty@minervaengineering.com



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Content-Type: application/x-tcl; name="Rf_lan.tcl"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="Rf_lan.tcl"

# Simple Representation of Teledesic Network Connection
# Modeled as an RF LAN 
# Copyright 1998 Minerva Engineering, LLC 
 
##################################### 
# INSERT DESCRIPTION AND SUCH HERE 
##################################### 
# This is going to be a representation of 2 UE's connecting  
# over the Teledesic Network. Each UE will connect to an  
# SV with 2 simplex links. 
##################################### 
 
##################################### 
# First we need to set up some base line variables and definitions 
# 
# satBW          Bandwidth of constellation internal links. 
# satDelay       Delay for constellation internal links. 
#  
# ue_BWup        Bandwidth of UE uplink 
# ue_Delayup     Delay of UE uplink 
# ue_BWdn        Bandwidth of UE downlink 
# ue_Delaydn     Delay of UE downlink 
#  
##################################### 
 
set satBW 4000Mb 
set satDelay 1us 
 
set ue_Delayup 2ms 
set ue_Delaydn 2ms 
 
##################################### 
# TCP related settings 
# 
# packetSize_:      size of a TCP packet 
# window_:          size of the sliding window 
#                   45 = 65KB 
# 
##################################### 
 
Agent/TCP set packetSize_ 1500 
Agent/TCP set window_ 45 
 
##################################### 
# Traffic related settings 
# 
# UE_traffic ammount of traffic generated at  
# each UE. In this case, the size of the FTP  
# Transfer. 
##################################### 
 
set numBytesFTP 537000 
 
##################################### 
# Misc Settings 
# 
# doNam:        Create a nam file? 
# sim_end:	End time of simulation (in seconds) 
# 
##################################### 
 
set doNam true 
set sim_end 45 
 
##################################### 
# Here we go!! 
# Create the new simulator object. 
#    This object is needed for almost every other 
#    function. 
##################################### 
 
set ns [new Simulator] 
 
##################################### 
# Nam Setup 
##################################### 
 
if {$doNam} { 
	$ns color 0 black 
	$ns color 1 red 
	$ns color 2 blue 
	$ns color 3 green 
	$ns color 4 yellow 
	$ns color 5 white 
        $ns color 6 cyan 
        $ns color 7 magenta 
        $ns color 8 pink 
	$ns color 28 purple 
	$ns color 29 orange 
	set nf [open RF_LAN.nam w] 
	$ns namtrace-all $nf 
} 
# Open the file for output of nam trace data 
set nf [open RF_LAN.nam w] 
$ns namtrace-all $nf 
 
##################################### 
# Enter the 2 stations to represent the UEs 
##################################### 
 
set UE_1 [$ns node] 
set UE_1 [$ns node] 
 
##################################### 
# Enter the 2 stations to represent the SVs 
##################################### 
 
set SV_1 [$ns node] 
set SV_2 [$ns node] 
 
#################################### 
# Create SV Network 
#################################### 
 
$ns duplex-link $SV_1 $SV_2 $satBW $satDelay DropTail 
 
#################################### 
# Create UE Links, 1 pair of simplex links per UE Connection  
#################################### 
 
$ns simplex-link $UE_1 $SV_1 3Mb $ue_Delayup DropTail 
$ns simplex-link $SV_1 $UE_1 3Mb $ue_Delaydn DropTail 
 
$ns simplex-link $UE_2 $SV_2 3Mb $ue_Delaydn DropTail 
$ns simplex-link $SV_2 $UE_2 3Mb $ue_Delaydn DropTail 
 
######################################## 
# Set up an FTP transfer to and from each  
# UE. Each UE needs a TCP and FTP Agent
# and an associated TCP sink. 
######################################## 
 
 
# UE TCP Processes 

# Reno TCP Agent @ UE_1 
# Assigned Flow Id 1 
    set tcp_1 [new Agent/TCP/Reno]	
    $ns attach-agent $UE_1  $tcp_1 
    $tcp_1 set fid_ 1			

# Reno TCP Agent @ UE_2 
# Assigned Flow Id 2 
    set tcp_2 [new Agent/TCP/Reno]	
    $ns attach-agent $UE_2  $tcp_2 
    $tcp_2 set fid_ 2			


# UE TCP Sinks 

# The sink @ UE_1 
    set Tsink_1 [new Agent/TCPSink]	
    $ns attach-agent $UE_1 $Tsink_1	
 
# The sink @ UE_2 
    set Tsink_2 [new Agent/TCPSink]	 
    $ns attach-agent $UE_2 $Tsink_2 
 
# Create Traffic Applications 

# FTP Agent  
# Attached to TCP @ UE_1 
    set ftp_1 [new Application/FTP]	
    $ftp_1 attach-agent $tcp_1
		
# FTP Agent  
# Attached to TCP @ UE_2  
    set ftp_2 [new Application/FTP]	
    $ftp_2 attach-agent $tcp_2		
 
 
# make connections 

# TCP @ UE_1 connects to TCP sink @ UE_2
    $ns connect $tcp_1 $Tsink_2		
# TCP @ UE_2 connects to TCP sink @ UE_1 
    $ns connect $tcp_2 $Tsink_1		 
 
#start transmissions at .1 and .5 seconds 
    $ns at 0.1 "$ftp_1 send $numBytesFTP"	
    $ns at 0.5 "$ftp_2 send $numBytesFTP"	 
 
 
 
# Finish up, close out the trace file and start nam 
 
proc finish  {} { 
    global ns nf 
    $ns flush-trace 
    close $nf 
    exec nam RF_LAN.nam & 
    exit 0 
} 
 
##################################### 
# Run the sim, then execute 'finish'. 
##################################### 
$ns at $sim_end "finish" 
 
##################################### 
# Actually run the sim. 
##################################### 
$ns run 
 
 

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