Help with [int ipaddr or ipaddr/cdir]



  • This is a basic question about network notation, but would appreciate help, or link to relatively easy tutorial on this

    I am entering some PC addresses in the Services/UPnp area under "User specified permissions"

    So I need to understand how to use "[int ipaddr or ipaddr/cdir]"

    I use a 192.168.0.x network at home with pfSense at 192.168.0.251
    My PC's start at 192.168.0.2 and upwards

    SO I believe these two are correct
    192.168.0.75/31 - specifies just one PC at 192.168.0.75
    192.168.0.0/24 - specifies all PC's, routers and printers in the 192.168.0.1-254 range

    BUt what does 192.168.0.75/32 mean
    ?
    And similarly , there seem to be options of 192.168.0.75/32 - any meaning?
    Also 192.168.0.75/30 or 192.168.0.75/29 or 192.168.0.75/28 - any meaning?

    Is there any way to name say three or four PC's in a consecutive range with this technique?

    Any help appreciated
    Jeff



  • I think this might help you:
    http://en.wikipedia.org/wiki/Subnetwork#Subnet_and_host_counts

    192.168.0.75/31 - specifies just one PC at 192.168.0.75
    192.168.0.0/24 - specifies all PC's, routers and printers in the 192.168.0.1-254 range

    If you want just one IP in your subnet it's a /32.


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