Re: Can I subnet my network like this ?

From: Jan Grant (Jan.Grant_at_bristol.ac.uk)
Date: 07/30/03

  • Next message: Ryan Watson: "Re: DNS server" 
    Date: Wed, 30 Jul 2003 13:59:31 +0100 (BST)
To: Supote Leelasupphakorn <pjn0211@yahoo.com>

    On Wed, 30 Jul 2003, [iso-8859-1] Supote Leelasupphakorn wrote:

    > Hi, all
    >
    > I would like to verify my knowledge
    > by building the network like below but not
    > sure whether it's impossible for subnetting
    > like this - say, from Gateway no2, is divided
    > to 172.16.0.0/16 and 172.17.0.0/16 subnet.

    There should be no problems doing what you suggest.

    > I heard that it isn't recommend or
    > impossible (not sure again) to use FIRST or
    > LAST subnet in the allocated IP address pool,
    > is it?

    This is no longer the case. It stems from (a misunderstanding of?) the
    "all zeros" or "all ones" network treatment (and by extension, subnets),
    but I don't think any kit behaves like that in these CIDR days. In any
    case, 172.16/16 and 172.17/16 are (were) both "full class B" ranges so
    anything broken enough to care ought to behave properly anyway. 

    -- 
jan grant, ILRT, University of Bristol. http://www.ilrt.bris.ac.uk/
Tel +44(0)117 9287088 Fax +44 (0)117 9287112 http://ioctl.org/jan/
Random act of violence against bread: whole pint.
  -- extract from the "Hawk the Slayer" drinking game
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