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expand comments in tap-dumbbell.cc to suggest some things to do

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This commit is contained in:
Craig Dowell
2009-01-31 22:41:43 -08:00
parent 1e6e554af7
commit 8e659dbc41
1 changed files with 62 additions and 1 deletions
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63
examples/tap-dumbbell.cc
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@@ -35,6 +35,46 @@
// | | | | | | | |
// ================ ================
// CSMA LAN 10.1.1 CSMA LAN 10.1.2
//
// The CSMA device on node zero is: 10.1.1.1
// The CSMA device on node one is: 10.1.1.2
// The CSMA device on node two is: 10.1.1.3
// The CSMA device on node three is: 10.1.1.4
// The P2P device on node three is: 10.1.2.1
// The P2P device on node four is: 10.1.2.2
// The CSMA device on node four is: 10.1.3.1
// The CSMA device on node five is: 10.1.3.2
// The CSMA device on node six is: 10.1.3.3
// The CSMA device on node seven is: 10.1.3.4
//
// Some simple things to do:
//
// 1) Ping one of the simulated nodes on the left side of the topology.
//
// ./waf --run tap-dumbbell&
// ping 10.1.1.3
//
// Take a look at the pcap traces and note that the timing of the packet
// movement reflects the delay configured on the CSMA lan.
//
// 2) Configure a route in the linux host and ping once of the nodes on the
// right, across the point-to-point link.
//
// ./waf --run tap-dumbbell&
// sudo route add -net 10.1.3.0 netmask 255.255.255.0 dev left gw 10.1.1.2
// ping 10.1.3.4
//
// Take a look at the pcap traces and note that the timing reflects the
// addition of the significant delay and low bandwidth configured on the
// point-to-point link.
//
// 3) Fiddle with the background CBR traffic across the point-to-point
// link and watch the ping timing change.
//
// ./waf --run "tap-dumbbell --ns3::OnOffApplication::DataRate=500kb/s"&
// sudo route add -net 10.1.3.0 netmask 255.255.255.0 dev left gw 10.1.1.2
// ping 10.1.3.4
//
#include <iostream>
#include <fstream>
@@ -111,7 +151,7 @@ main (int argc, char *argv[])
// Stick in the point-to-point line between the sides.
//
PointToPointHelper p2p;
p2p.SetDeviceAttribute ("DataRate", StringValue ("1500kbps"));
p2p.SetDeviceAttribute ("DataRate", StringValue ("512kbps"));
p2p.SetChannelAttribute ("Delay", StringValue ("10ms"));
NodeContainer nodes = NodeContainer (nodesLeft.Get(3), nodesRight.Get (0));
@@ -121,6 +161,27 @@ main (int argc, char *argv[])
ipv4.SetBase ("10.1.2.0", "255.255.255.192");
Ipv4InterfaceContainer interfaces = ipv4.Assign (devices);
//
// Simulate some CBR traffic over the point-to-point link
//
uint16_t port = 9; // Discard port (RFC 863)
OnOffHelper onoff ("ns3::UdpSocketFactory", InetSocketAddress (interfaces.GetAddress (1), port));
onoff.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1)));
onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0)));
onoff.SetAttribute ("DataRate", StringValue ("256kb/s"));
onoff.SetAttribute ("PacketSize", UintegerValue (512));
ApplicationContainer apps = onoff.Install (nodesLeft.Get (3));
apps.Start (Seconds (1.0));
apps.Stop (Seconds (10.0));
// Create a packet sink to receive these packets
PacketSinkHelper sink ("ns3::UdpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), port));
apps = sink.Install (nodesRight.Get (0));
apps.Start (Seconds (1.0));
apps.Stop (Seconds (10.0));
CsmaHelper::EnablePcapAll ("tap-dumbbell");
GlobalRouteManager::PopulateRoutingTables ();