cannot resolve destination address in omnet++/inet module

[sohini basu]

I am trying to design a 3 tier datacenter model using INET modules. But when I run the network then every time a TCP socket is created,  I get the below mentioned error:

starting session

issuing OPEN command

cannot resolve destination address: 

My ned files are as below:

Ned for the rack

import inet.nodes.inet.Router;

import inet.nodes.inet.StandardHost;

import inet.nodes.ethernet.Eth10M;

import inet.networklayer.autorouting.ipv4.IPv4NetworkConfigurator;

module Rack

{

    

    parameters:

        //int N @prompt(“Nodes per rack”);

        int N = default(10)

        @display("bgb=392,190");

    gates:

        inout iogate[];

    submodules:

        ComputingServer[N]: StandardHost {

            @display("p=120,91");

        }

        AccessRouter: Router {

            @display("p=289,91");

        }

        configurator: IPv4NetworkConfigurator;

    

connections:

        for i=0..N-1 {

            AccessRouter.ethg++ <--> Eth10M <--> ComputingServer[i].ethg++;

        }

        AccessRouter.ethg++ <--> iogate++;

        AccessRouter.ethg++ <--> iogate++;

}

Ned for the network

import inet.nodes.inet.Router;

import inet.nodes.inet.StandardHost;

import inet.nodes.ethernet.Eth100M;

import inet.networklayer.autorouting.ipv4.IPv4NetworkConfigurator;

network Basic_leafspine_tcp

{

    parameters:

        int N = default(4);

        int AGR = default(4);

        int CR = default(2);

    submodules:

        AGRouter[AGR]: Router {

            @display("p=131,167");

        }

        CRouter[CR]: Router {

            @display("p=204,52");

        }

        Racks[N]: Rack {

            @display("p=131,304");

        }

        configurator: IPv4NetworkConfigurator;

        

    connections allowunconnected:

        for i=0..CR-1, for j=0..AGR-1 {

            CRouter[i].ethg++ <--> Eth100M <--> AGRouter[j].ethg++;

        }

        for i=0..1, for j=0..1 {

            AGRouter[i].ethg++ <--> Eth100M <--> Racks[j].iogate++;

        }

        for i=2..3, for j=2..3 {

            AGRouter[i].ethg++ <--> Eth100M <--> Racks[j].iogate++;

        }

}

The ini file is below :

[Config basic_leafspine]

network = Basic_leafspine_tcp

**.tcpType = "TCP"

**.tcp.advertisedWindow = 65535

**.tcp.delayedAcksEnabled = false

**.tcp.increasedIWEnabled = false

**.tcp.limitedTransmitEnabled = false

**.tcp.mss = 1452

**.tcp.nagleEnabled =true 

**.tcp.receiveQueueClass = default

**.tcp.recordStats = true

**.tcp.sackSupport = false

**.tcp.sendQueueClass = default

**.tcp.tcpAlgorithmClass = default

**.tcp.timestampSupport = true

**.tcp.windowScalingSupport = false

**.numTcpApps = 1

**.tcpApp[*].typename="TCPBasicClientApp"

**.tcpApp[*].localAddress = ""

**.tcpApp[*].localPort = -1

**.tcpApp[*].connectPort = 80

**.tcpApp[*].startTime = 0s

**.tcpApp[*].requestLength = 350B

**.tcpApp[*].replyLength = 5MiB

**.tcpApp[*].numRequestsPerSession = 1

**.tcpApp[*].thinkTime = 3s

**.tcpApp[*].idleInterval = 10s

**.tcpApp[*].reconnectInterval = 50s

**.tcpApp[*].dataTransferMode = "object"

Please help me to rectify the error.