包基于以太网地址被转发而非基于IP地址（如同路由器）。
Packets are forwarded based on Ethernet address, rather than IP address (like a router).
可以让一个大型多节点系统中的一些或所有以太网适配器共用一个IP地址，这对系统管理和网络管理有帮助。
Having one IP address for some or all of the Ethernet adapters in a large multi-node system can be beneficial for system administrators and network administration.
如果您位于一个带有DHCP的网络上，那么您可能会发现您的系统在其主以太网端口上已经有了一个IP地址。
If you're on a network with DHCP, you'll probably find that your system has already come up with an IP address on its primary Ethernet port.
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