This indicates that it will block all incoming traffic and allow all outgoing traffic. This is a good starting point for most desktop systems. However, often we will want to allow some incoming traffic. This can be done with the command {{ic|ufw allow}}. For example, if we want to allow incoming ssh traffic so we can connect to the machine from other machines on the network we could use the command: $usercmd4
这表示它将阻止所有传入流量并允许所有传出流量。这在大多数情况下是一个很好的起点。但是，您通常希望允许一些传入的流量。这可以通过命令 UFW允许来完成。例如，如果您想要允许传入的SSH流量，所以您可以从网络上的其他机器连接到这台机器，您可以使用： sudo ufw allow ssh
UFW允许