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Article #58Re: Subnetting Class C IP networks
From: Steve Fosdick
Date: Fri, 04 Mar 1994 23:14
Date: Fri, 04 Mar 1994 23:14
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Ken Mintz (mintz@cup.hp.com) wrote: > Mark Landin (landin@cherokee.nsuok.edu) wrote: > > Can you subnet a Class C address, say by using a mask like 255.255.255.128? > Not 128 specifically, but certainly other values, such as 192, 224 etc. > The problem with 128 per se is that that creates a one-bit subnet id. > Since all-zero and all-one values have special meaning, subnet id and host > id fields must comprise at least __two__ bits each. > -- Ken Mintz > PS: Some implementations do permit one-bit subnet ids, but this is non- > conformant. We used 255.255.255.128 successfully, but we are already subnetting because our adress is actually class B. -- Steve Fosdick Post: Room 210, B67, BT Labs, E-mail: stevef@aom.bt.co.uk Martlesham Heath, Tel: +44 473 642987 IPSWICH IP5 7RE Fax: +44 473 644607 England
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fcda7,5d0c824272d4a044 X-Google-Attributes: gidfcda7,public X-Google-Thread: fe659,5d0c824272d4a044 X-Google-Attributes: gidfe659,public X-Google-Thread: 10f035,5d0c824272d4a044 X-Google-Attributes: gid10f035,public X-Google-ArrivalTime: 1994-03-04 15:14:35 PST Path: arc1-ca.pugleaf.net!gmd.de!dearn!blekul11!news.cs.kuleuven.ac.be!ub4b!EU.net!howland.reston.ans.net! pipex!uknet!zaphod.axion.bt.co.uk!demeter.aom.bt.co.uk!medusa.aom.bt.co.uk!not-for-mail From: stevef@aom.bt.co.uk (Steve Fosdick) Newsgroups: comp.sys.hp.hpux,comp.sys.novell,bit.listserv.novell Subject: Re: Subnetting Class C IP networks Date: 4 Mar 1994 23:14:35 -0000 Organization: BT Access Operations and Maintenance Lines: 20 Message-ID: <2l8fcr$5kc@medusa.aom.bt.co.uk> References: <1994Mar4.142909.12080@cherokee.nsuok.edu> <CM5JM7.D19@cup.hp.com> NNTP-Posting-Host: medusa.aom.bt.co.uk X-Newsreader: TIN [version 1.2 PL2]