请章博士帮忙，一个问题困扰我好长时间啦。

我在阅读Understanding Linux Network Internals 一书时，在第28章“Responding from Multiple Interfaces” 一节看到作者说：Linux has a rather unusual design: it considers an IP address as belonging to a host rather than an interface, even though administrators always assign IP addresses to particular interfaces。他在书中"图28-5"举的例子和LVS情形也不一样。这一点我不太明白，linux为何要这样实现呢？千言万语不多说，你能讲讲他的原因，原理，历史吗？