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原帖由 yishon 于 2007-7-16 00:33 发表
这个问题也有点没有水平,拿思科路由器来讲,因为编写CISCO IOS的程序员没有在程序里边设计让某个接口配置全0或全1的IP地址,现在思科的程序员发现使用全0全1的IP或许也没有问题,于是在高版本的IOS中就定义了这样的IP ……于是我们就可以使用了
我真的愿意相信IOS的程序员能起这么关键性的作用。事实是:http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080093f18.shtml
Traditionally, it was strongly recommended that subnet zero and the all-ones subnet not be used for addressing. According to RFC 950, "It is useful to preserve and extend the interpretation of these special (network and broadcast) addresses in subnetted networks. This means the values of all zeros and all ones in the subnet field should not be assigned to actual (physical) subnets."
On the issue of using subnet zero and the all-ones subnet, RFC 1878 states, "This practice (of excluding all-zeros and all-ones subnets) is obsolete. Modern software will be able to utilize all definable networks." Today, the use of subnet zero and the all-ones subnet is generally accepted and most vendors support their use.
我说得不对请扔砖头啊. |
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