SSH 可以工作，但无法 PING 和访问 Raspberry Pi 3B 的 VNC 查看器
[英]SSH works but cannot PING and access VNC viewer for Raspberry Pi 3B
问题描述
On my Mac terminal, I can get my Pi ip address using this command line:
在我的 Mac 终端上，我可以使用以下命令行获取我的 Pi ip 地址：
arp -n raspberrypi.local arp -n 树莓派.local
it return the IP address of the pi.它返回 pi 的 IP 地址。 and then I can absolutely SSH into the raspberry pi using these command lines:然后我可以绝对 SSH 使用这些命令行进入树莓派：
ssh-keygen -R raspberrypi.local ssh pi@raspberrypi.local ssh-keygen -R raspberrypi.local ssh pi@raspberrypi.local
However if I ping the pi, it return request timeout and I also cannot access the vnc viewer.但是，如果我 ping pi，它会返回请求超时，我也无法访问 vnc 查看器。
PING from Network Utility来自网络实用程序的 PING
Everything worked just fine when I first log in to this raspberry pi but then this happened.当我第一次登录这个树莓派时，一切都很好，但后来发生了这种情况。
1 个解决方案
解决方案1
0 2021-02-03 21:27:26
A device not responding to ping doesn't mean it has a problem.设备不响应 ping 并不意味着它有问题。 "Ping" packets (https://it.wikipedia.org/wiki/Internet_Control_Message_Protocol ) have to be allowed to reach a destination and the destinations has to be allowed to reply.必须允许“Ping”数据包（https://it.wikipedia.org/wiki/Internet_Control_Message_Protocol ）到达目的地，并且必须允许目的地回复。 Usually there's a firewall allowing/denying this kind of traffic.通常有一个防火墙允许/拒绝这种流量。
Assuming the services you're speaking about, are correctly running on the machine (server) you want to connect to:假设您正在谈论的服务在您要连接的机器（服务器）上正确运行：
- ssh runs on port 22: a firewall policy need top be in place to allow you (the client) to connect to the server on port 22 ssh 在端口 22 上运行：需要设置防火墙策略以允许您（客户端）在端口 22 上连接到服务器
- vnc runs on port 5900 (and above) according to the configuration: also in this situation, a firewall policy has to be in place to allow you (the client) to connect to the server vnc 根据配置在端口 5900（及以上）上运行：同样在这种情况下，必须设置防火墙策略以允许您（客户端）连接到服务器
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