A socket operation was attempted to an unreachable host.

套接字操作尝试一个无法连接的主机。

To setup NAT networking you need to select a network number that is normally unreachable from the host.

要正确设置NAT网络，我们必须选择一个从宿主机无法访问的网络地址(笔者注：和宿主机物理网卡不在同一个网段)。

To setup NAT networking you need to select a network number that is normally unreachable from the host.

要正确设置NAT网络，必须选择一个从宿主机无法访问的网络地址。