RFC 1219:On the Assignment of Subnet Numbers
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gateway


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... subnets requires partitioning the subnet and inserting a gateway between the two partitions. For obvious reasons, this is not a desirable course of action. Logically forming two subnets ...
... subnet numbers will not recognize that the others are on the same subnet, and will send packets to the default gateway rather than directly to the host. In fact, this is not such a bad solution, ...
... directly to the host. In fact, this is not such a bad solution, because assuming that the gateway is capable of recognizing multiple subnet numbers on the same subnet ...
... subnet numbers on the same subnet, the gateway will simply send the host an ICMP ...


... subnet. In this case, the host will send packets to the gateway, and will be redirected to the host. ...


... Braden, R., and J. Postel, "Requirements for Internet Gateways", RFC 1009hist(-> 1812prop), USC/Information Sciences Institute, June 1987. ...



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