.255 mac地址全f， 是广播地址
192.168.1.255 ff-ff-ff-ff-ff-ff static
192.168.1.1 d4-9e-05-8f-1c-f6 dynamic 网关
路由器隔离广播域
In computer networking, a broadcast domain is a logical division of a computer network, in which all nodes can reach each other by broadcast at the data link layer. A broadcast domain can be within the same LAN segment or it can be bridged to other LAN segments.
Router is a device that operates at the network layer of the OSI model. It is used to connect different networks together and route packets between them. By default, routers do not forward broadcast packets between different networks, which means that they can be used to isolate broadcast domains.
To isolate broadcast domains using a router, you can create separate subnets for each broadcast domain and configure the router to route packets between them. This will prevent broadcast traffic from one subnet from being forwarded to another subnet, effectively isolating the broadcast domains.
arp广播报文，会被路由器隔离。
如果要起作用，需要添加网关。