尝试更改数据包ip并将其发送出去

这是我在这里的第一个问题，所以请温柔！

最近，我试图构建一个可以获取Wireshark文件并将所有数据包发送到网络的应用程序，经过几天的阅读，我发现了Pcap.Net项目，在构建我的应用程序（winform）后，我想添加高级选项，如更改IP地址、MAC地址等。Pcap.Net支持所有这些。在我的例子中，在分配缓冲区后，我试图更改数据包ip，构建新的数据包（使用新的ip），并用我的文件中的所有数据包填充缓冲区（在发送之前）：

// Allocate a send buffer
using (PacketSendBuffer sendBuffer = new PacketSendBuffer((uint)capLength))
{
    // Fill the buffer with the packets from the file
    int numPackets = 0;
    Packet packet;
    while (inputCommunicator.ReceivePacket(out packet) == PacketCommunicatorReceiveResult.Ok)
    {
        IpV4Layer ipLayer = (IpV4Layer)packet.Ethernet.IpV4.ExtractLayer();
        ipLayer.Destination = new IpV4Address("11.12.13.14");
        EthernetLayer ethernet = (EthernetLayer)packet.Ethernet.ExtractLayer();
        PayloadLayer payload = (PayloadLayer)packet.Ethernet.Payload.ExtractLayer();
        Packet newPacket = PacketBuilder.Build(DateTime.Now, ethernet, ipLayer, ipLayer, payload);
        sendBuffer.Enqueue(newPacket);
        ++numPackets;
    }
    outputCommunicator.Transmit(sendBuffer, isSync); //Transmit the queue
}

我的问题是在线路sendBuffer.Enqueue(newPacket)之后。

我收到以下错误：Failed enqueueing to SendQueue

也许有人能帮我明白怎么了？

PayloadLayer payload = (PayloadLayer)packet.Ethernet.Payload.ExtractLayer();
// and
Packet newPacket = PacketBuilder.Build(DateTime.Now, ethernet, ipLayer, ipLayer, payload);

PayloadLayer payload = (PayloadLayer)packet.Ethernet.IpV4.Payload.ExtractLayer();
// and
Packet newPacket = PacketBuilder.Build(DateTime.Now, ethernet, ipLayer, payload);