Question

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

starting session
issuing OPEN command
cannot resolve destination address:

我的文件如下：

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_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"

请帮我纠正错误。我刚开始使用inet进行编码。

Answer 1

有两个错误：

TCP连接是非对称的，它需要客户端和服务器。 TCPBasicClientApp仅限客户端应用程序。作为服务器，您应该使用TCPGenericSrvApp，参考。 INET Manual。
您没有写入TCP连接的目标地址。您应该确定哪个或哪些主机将是服务器（即侦听传入连接），以及哪些主机将建立连接（即充当客户端）。

例如：假设ComputingServer[0]中的Racks[0]是服务器并且它侦听端口号80，并且所有其他主机都连接到它，那么omnetpp.ini应该是这样的：

[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

线索：在INET中，可以使用主机名作为IP地址此外，我建议从@display()文件中删除所有NED指令，因为它们会在同一位置创建所有对象（该类型）。如果没有@display()模拟环境，将选择每个模块的正确位置。

无法在omnet ++ / inet模块中解析目标地址

1 个答案: