Date: Wed, 30 Jul 2003 13:59:31 +0100 (BST) From: Jan Grant <Jan.Grant@bristol.ac.uk> To: =?iso-8859-1?q?Supote=20Leelasupphakorn?= <pjn0211@yahoo.com> Cc: freebsd-questions@freebsd.org Subject: Re: Can I subnet my network like this ? Message-ID: <Pine.GSO.4.44.0307301353250.21098-100000@mail.ilrt.bris.ac.uk> In-Reply-To: <20030730124609.40316.qmail@web40614.mail.yahoo.com>
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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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