Problems in data transfer between wireless hosts using TCP

[Tiến Thành Nguyễn]

Hello everyone,

i'm trying to simulate a MANET network using TCP, and the routing protocol i'm using is AODV. I try to have 4 hosts sends data to each other in pair ( host 1 to host 2; host 3 to host 4) but when i run the simulation, only host 1 send data, host 3 who needs to send data to just stand still and do nothing. Here is my ned and ini file. can someone tell me what i do wrong? thanks!

My ned file:

import inet.networklayer.configurator.ipv4.IPv4NetworkConfigurator;

import inet.node.aodv.AODVRouter;

import inet.physicallayer.idealradio.IdealRadioMedium;

network NeighborCacheTest

{

    parameters:

        int numHosts;

    submodules:

        radioMedium: IdealRadioMedium {

            parameters:

                @display("p=50,50");

        }

        configurator: IPv4NetworkConfigurator {

            parameters:

                config = xml("<config><interface hosts='*' address='145.236.x.x' netmask='255.255.0.0'/></config>");

                @display("p=50,100");

        }

        host[numHosts]: AODVRouter {

            parameters:

                @display("i=device/pocketpc_s;r=,,#707070");

        }

    connections allowunconnected:

}

My ini file:

**.constraintAreaMinX = 0m

**.constraintAreaMinY = 0m

**.constraintAreaMinZ = 0m

**.constraintAreaMaxX = 100m

**.constraintAreaMaxY = 100m

**.constraintAreaMaxZ = 0m

# channel physical parameters

**.wlan[*].typename = "IdealWirelessNic"

**.wlan[*].bitrate = 1Mbps

**.wlan[*].mac.address = "auto"

**.wlan[*].mac.headerLength = 20B

**.wlan[*].radioType = "IdealRadio"

**.wlan[*].radio.transmitter.headerBitLength = 0b

**.wlan[*].radio.transmitter.communicationRange = 250m

**.wlan[*].radio.transmitter.interferenceRange = 0m

**.wlan[*].radio.transmitter.detectionRange = 0m

**.wlan[*].radio.receiver.ignoreInterference = true

*.numHosts = 4

# mobility

**.host[0..1].mobilityType = "StationaryMobility"

**.host[*].mobility.initialX = uniform(0m, 100m)

**.host[*].mobility.initialY = uniform(0m, 100m)

**.host[*].mobility.initialZ = 0m

*.host[*].numTcpApps = 1

**.host[0].tcpApp[0].typename = "TCPSessionApp"

**.host[0].tcpApp[0].connectPort=  1234

**.host[0].tcpApp[0].connectAddress = "host[1]"

**.host[1].tcpApp[0].sendBytes = 500B

**.host[1].tcpApp[0].typename = "TCPSinkApp"

**.host[1].tcpApp[0].localPort= 1234

**.host[2].tcpApp[0].typename = "TCPSessionApp"

**.host[2].tcpApp[0].connectPort=  1234

**.host[2].tcpApp[0].connectAddress = "host[3]"

**.host[2].tcpApp[0].sendBytes = 500B

**.host[3].tcpApp[0].typename = "TCPSinkApp"

**.host[3].tcpApp[0].localPort= 1234

# AODV protocol settings

**.aodv.activeRouteTimeout = 3s

# neighbor cache settigns

**.neighborCache.refillPeriod = 1s

# radio medium

**.radioMedium.rangeFilter = "communicationRange"

**.radioMedium.neighborCacheType = "NeighborListNeighborCache"

**.radioMedium.neighborCache.range = 250m

[Tiến Thành Nguyễn]

can anyone help me please? i'm really stuck here

[Alfonso Ariza Quintana]

Are you sure that the node 2 doesn’t start a connection?

By default it should start a connection at the second 1.

 

Other problem is if the node can find a valid route, both nodes start the communication at the same time and exist a risk of collision in the RREQ/RREP packets sequence.

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[Tiến Thành Nguyễn]

 

Dear Alfonso,

thank you for your response sir! I've tried setting host 0 and host 2 to send at the same time or different time but it still not work, still only host 0 communicate with host 1. isn't it supposed that these two connection are independent? i would appreciate if you could help me sir.

[Alfonso Ariza Quintana]

Have you check if the packet is sent?

It is possible that the application starts the connection but the nodes cannot communicate

[Tiến Thành Nguyễn]

That's the problem that i want to ask sir. i configure host 2 with "TCPSessionApp" and sendbytes= 500B but it doesnt send any packet. only host 0 does.

[Alfonso Ariza Quintana]

You need to check if the connection is done in the node, not if the packet is transmitted. You can check the trace in the node

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De: omn...@googlegroups.com <omn...@googlegroups.com> en nombre de Tiến Thành Nguyễn <tienth...@gmail.com>
Enviado: martes, 14 de noviembre de 2017 11:27
Para: OMNeT++ Users

Asunto: Re: [Omnetpp-l] Re: Problems in data transfer between wireless hosts using TCP

 

That's the problem that i want to ask sir. i configure host 2 with "TCPSessionApp" and senbytes= 500B but it doesnt send any packet. only host 0 does.

[Tiến Thành Nguyễn]

Dear Alfonso,

Thank you for your response. I think the solution is that i need to use two radios for each node. One more problem that i have now is when i set the sendbytes = 300B. Only 300B is sent, and after that, the nodes stop sending package and it said " no more event, simulation completed". what i'm trying to do is to make the node send that 300B repeatedly until i stop the simulation. can you tell me how to do it? thanks.