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找到了。
RFC 950 - Internet Standard Subnetting Procedure中有一小句这样子的声明:
Since the bits that identify the subnet are specified by a bitmask, they need not be adjacent in the address. However, we recommend that the subnet bits be contiguous and located as the most significant bits of the local address.
然后在RFC 1219 - On the assignment of subnet numbers对RFC 950其中的子网号设定作了一些补充,在这里就可以看到对RFC 950的一些总结:
RFC-950 [2] specifies a procedure for subnetting Internet addresses using a bit-mask. While RFC-950 allows the "ones" in the subnet mask to be non-contiguous, RFC-950 recommends that 1) they be contiguous, and 2) that they occupy the most significant bits of the "host" part of the internet address. |
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