5/28/2023 0 Comments Subnet mask tableThe tables below depict the number of subnetting bits and the resulting network, broadcast address, and host addresses. Depending on the network topology and the router configuration, packets destined for IP address 192.31.7.49 might be sent to the wrong destination host, sent from the wrong interface, or dropped altogether. RFC 1878 Subnet Table December 1995 Subnets and Networks The number of available network and host addresses are derived from the number of bits used for subnet masking. However, because it is using a different subnet mask, the router interprets the address as being Host 17 on the first subnet (subnet address 32). The host interprets the IP address 192.31.7.49 as being Host 1 on the third subnet (subnet address 48). Table 7-10 Host and Router Subnet Mask Mismatch Example Table 7-10 shows how a UNIX host and a router will interpret an IP address differently if they have different subnet masks specified for the same major network. If there are disagreements on the length of the subnet mask, packets are not routed correctly. In classful IP networks, every router and host in the same major network should share a common subnet mask.
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