硬件不会响应彼此的ARP请求

Question

我有两个硬件(嵌入式设备)，我已经设置了通过TCP通过以太网以客户机/服务器的方式进行通信。

该网络的拓扑结构如下：

-----
| S ||=|== Debug PC (w/ Wireshark) 192.168.10.41
| W ||=|== Hardware 1 TCP Client 192.168.10.42
| I ||=|== Hardware 2 TCP Server 192.168.10.40
| T |
| C |
| H |
-----

当硬件1试图向服务器发送数据包时，硬件2首先发送一个ARP包来获取硬件2's MAC地址：

No.     Time        Source             Destination  Protocol Length Info
157 11772.776136 Microchi_13:c3:6a     Broadcast    ARP      60     Who has 192.168.10.40?  Tell 192.168.10.42

但是，它没有收到来自服务器的答复，然后服务器ARPs为客户端MAC在几分钟后：

No.     Time        Source             Destination  Protocol Length Info
158 12183.800839 00:3f:2d:02:1a:35     Broadcast    ARP      60     Who has 192.168.10.42?  Tell 192.168.10.40

它也没有收到客户端的答复。我很困惑。

我知道服务器的应答是正确的，因为我用C#编写了一个简单的TCP客户端，它可以从Debug连接和发送数据包到服务器。

我不知道为什么我的硬件客户端不能通信。

谢谢你提前帮忙。

如果需要的话

ARP数据包的详细信息：

来自客户：

Ethernet II, Src: Microchi_13:c3:6a (00:04:a3:13:c3:6a), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
    Source: Microchi_13:c3:6a (00:04:a3:13:c3:6a)
    Type: ARP (0x0806)
    Trailer: 000000000000000000000000000000000000
Address Resolution Protocol (request)
    Hardware type: Ethernet (1)
    Protocol type: IP (0x0800)
    Hardware size: 6
    Protocol size: 4
    Opcode: request (1)
    [Is gratuitous: False]
    Sender MAC address: Microchi_13:c3:6a (00:04:a3:13:c3:6a)
    Sender IP address: 192.168.10.42 (192.168.10.42)
    Target MAC address: Broadcast (ff:ff:ff:ff:ff:ff)
    Target IP address: 192.168.10.40 (192.168.10.40)

来自服务器：

Frame 158: 60 bytes on wire (480 bits), 60 bytes captured (480 bits)
Ethernet II, Src: 00:3f:2d:02:1a:35 (00:3f:2d:02:1a:35), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
    Source: 00:3f:2d:02:1a:35 (00:3f:2d:02:1a:35)
    Type: ARP (0x0806)
    Trailer: 000000000000000000000000000000000000
Address Resolution Protocol (request)
    Hardware type: Ethernet (1)
    Protocol type: IP (0x0800)
    Hardware size: 6
    Protocol size: 4
    Opcode: request (1)
    [Is gratuitous: False]
    Sender MAC address: 00:3f:2d:02:1a:35 (00:3f:2d:02:1a:35)
    Sender IP address: 192.168.10.40 (192.168.10.40)
    Target MAC address: 00:00:00_00:00:00 (00:00:00:00:00:00)
    Target IP address: 192.168.10.42 (192.168.10.42)

Answer 1

在您的“调试PC”交换机端口上，您不会看到任何ARP回复为它们正在向目标主机进行单播。。您的交换机正在过滤单播包到外国目的地为您的“调试PC”。如果您也需要监视单播通信量，您可以使用集线器而不是交换机，或者启用交换机上的“监视器”或“镜像端口”功能 (大多数托管交换机确实有类似的内容)，以使所有通信量(包括外国单播涌入“调试PC”端口)。