无法解析omnet++/inet模块中的目的地址

Question

我正在尝试使用INET模块设计一个3层数据中心模型。但是当我运行网络时，每次创建TCP套接字时，我都会得到下面提到的错误:

starting session
issuing OPEN command
cannot resolve destination address: 

我需要的文件如下:

机架所需

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 network

import inet.nodes.inet.Router;
import inet.nodes.inet.StandardHost;
import inet.nodes.ethernet.Eth100M;
import inet.networklayer.autorouting.ipv4.IPv4NetworkConfigurator;
network Basic_dcn_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++;
        }
}

ini文件如下:

[Config basic_dcn]
network = Basic_dcn_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"

请帮我纠正这个错误。我刚开始用inet编写代码。

Answer 1

有两个错误:

1. TCP连接是非对称的，它需要一个客户端和一个服务器。TCPBasicClientApp仅是一个客户端应用程序。作为服务器，你应该使用TCPGenericSrvApp，参考INET Manual.
您没有写入TCP连接的目的地址。您应该决定哪个主机或多个主机将作为服务器(即侦听传入的连接)，哪些主机将建立连接(即充当客户端)。

例如:假设Racks[0]中的ComputingServer[0]是一个服务器，它监听端口号80，并且所有其他主机都连接到它，您的omnetpp.ini应该看起来像:

[Config basic_dcn]
network = Basic_dcn_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[*].startTime = 0s
**.tcpApp[*].requestLength = 350B
**.tcpApp[*].replyLength = 5MiB
**.tcpApp[*].numRequestsPerSession = 1
**.tcpApp[*].thinkTime = 3s
**.tcpApp[*].idleInterval = 10s
**.tcpApp[*].reconnectInterval = 50s
**.tcpApp[*].dataTransferMode = "object"
# Racks[0].ComputingServer[0] listens on port 80
*.Racks[0].ComputingServer[0].tcpApp[*].typename = "TCPGenericSrvApp"
*.Racks[0].ComputingServer[0].tcpApp[*].localPort = 80
*.Racks[0].ComputingServer[0].tcpApp[*].localAddress = "" 
# all other hosts connect to  Racks[0].ComputingServer[0]
*.Racks[*].ComputingServer[*].tcpApp[*].typename = "TCPBasicClientApp"
*.Racks[*].ComputingServer[*].tcpApp[*].localPort = -1
*.Racks[*].ComputingServer[*].tcpApp[*].connectAddress = "Basic_dcn_tcp.Racks[0].ComputingServer[0]"
*.Racks[*].ComputingServer[*].tcpApp[*].connectPort = 80

提示:在INET中可以使用主机名作为IP地址。此外，我建议从NED文件中删除所有@display()指令，因为它们使所有对象(该类型)位于同一位置。在没有@display()的仿真环境下会选择各个模块的合适位置。