Learning about network subsets - Overlapping addresses?

  • Hello,

    So first of all, I'm not certain which topic this subject belongs to so I apologize in advance.

    I've been having a hard time finding a straight forward answer to my question so I would be grateful if you would give me advice on this matter.

    I've been told that subnets divided in such a way that you segment part of the 32-bit network address to mean the network, and the other half to mean host address? IE: (<network><host>)

    In this sense is it possible to have an IP address - say for instance - in the subnet of and another same address in the subnet of'
    If so, would these two addresses be mutually exclusive?

    Needless to say, networking isn't my profession, but I would still love to learn all about it. So, I would very much appreciate any advice or resources you would give me.  :)

    Thanks in advance,
    Michael L.</host></network>

  • LAYER 8 Netgate


    If a host in subnet tried to contact a host in it would think it is on its local subnet and not try to route it to the gateway.

    Be careful to distinguish between routes and subnets.

    If a router has the following two routes: to gateway to gateway

    That will work because the route with the longest mask will get the traffic.

  • Subnetting and superscoping are ways to address groups of IP addresses instead of individually.  It makes for less code which makes it faster.  There are a few gotcha  like every network has a network address and a broadcast address which can be overlaid on a larger address space.  You just need to be aware of it.

  • There's a nice CIDR/subnet calculator online that shows you exactly what addresses are part of a particular subnet and the details of the subnet in address/CIDR/netmask notations.


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