With ever-increasing pressure to conserve IP address space on the Internet@ it makes sense to consider where relatively minor changes can be made to fielded practice to improve numbering efficiency. One such change@ proposed by this document@ is to halve the amount of address space assigned to point-to-point links (common throughout the Internet infrastructure) by allowing the use of 31-bit subnet masks in a very limited way.
RFC 3021-2000由IETF - Internet Engineering Task Force 发布于 2000-12-01,并于 2012-03-22 实施。
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