Network Masks

Discussion in 'Home Networking' started by Geoff Lane, Apr 2, 2005.

  1. Geoff Lane

    Geoff Lane Guest

    I've never quite got my head around network masks although, generally
    my home network performs fine.

    I'm looking in to using the latest version of RealVNC which has a
    security option to allow or disallow certain addresses but is seems to
    require the format 0.0.0.0/0.0.0.0

    Am I correct it assuming 192.168.1.1/255.255.255.0 would allow any
    address from 192.168.1.1 up to 192.168.1.255 (Disallowing the certain
    prohibited ones) whereas 192.168.1.1/255.255.255.255 would only allow
    the exact address of 192.168.1.1

    Geoff Lane
     
    Geoff Lane, Apr 2, 2005
    #1
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  2. Geoff Lane

    Dr Zoidberg Guest

    Correct.

    (Disallowing the certain
    Again , correct.

    It gets a little bit more complicated when you use masks of other than 8 ,
    16 , 24 or 32 bits and in that situation you would generally want to convert
    into binary if calculating it yourself , or use a subnet calculator like
    this one.

    http://www.solarwinds.net/Tools/Free_tools/Subnet_Calc/
    --
    Alex

    Hermes: "We can't afford that! Especially not Zoidberg!"
    Zoidberg: "They took away my credit cards!"

    www.drzoidberg.co.uk
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    Dr Zoidberg, Apr 2, 2005
    #2
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  3. Geoff Lane

    David Guest

    I'm not sure whether your first example needs to be
    192.168.1.0/255.255.255.0 or it may simply be that using the .0 in the ip
    address is merely the conventional way of entering the 192.168.1.1 -
    192.168.1.254 range.

    The second looks correct.

    David.
     
    David, Apr 2, 2005
    #3
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