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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.mel.connect.com.au!news.bekkers.com.au!usenet From: Jan Hurst <jhurst@bekkers.com.au> Newsgroups: comp.unix.bsd.bsdi.misc Subject: Re: Subnet - help please! Date: Tue, 30 Jul 1996 16:10:32 +0800 Organization: Bekkers Communications Australia Lines: 46 Message-ID: <31FDC378.3BE@bekkers.com.au> References: <31FBF6A4.337D@albury.net.au> Reply-To: jhurst@elmer.bekkers.com.au NNTP-Posting-Host: jan.bekkers.com.au Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0b5 (Win95; I) To: Ross Wheeler <rossw@albury.net.au> Hi, Just my 2c worth, > Situation: I have a second class c address that I want to bust up. > > aaa.bbb.ccc.0 is my first block, and everything works fine. > aaa.ddd.eee.0 is the second block - and i want to subnet it. > > If I use netmask of 255.255.255.240 (16 addresses (14 hosts) per subnet), that should give me the first > subnet as aaa.ddd.eee.1 to aaa.ddd.eee.14 (exclude .0 and .15, right?) > Using netmasks loses certain IP ranges, I don't think you can use 1-15 with that netmask. You can start from 16 onwards ending in 240 from memory (?). > That network is available out a port on the terminal server, (which I have in the DNS), so I can say: > route add aaa.ddd.eee.1 remotehost.albury.net.au -netmask 255.255.255.240 > route add -network aaa.ddd.eee.16 remotehost.albury.net.au -netmask 255.255.255.240 or something similar (i forget exactly off the top of my head) > When I do a netstat -r | grep aaa.ddd.eee I get > aaa.ddd.eee/28 remotehost.albury.net.au UGS xxxxx xxx xxx > > Since the other hosts on that net (aaa.ddd.eee.16 to aaa.ddd.eee.254) are on the local ethernet, I should > be able to specify them as being on ef0, right? I was under the impression that to get to a subnet you must go accross a router somewhere. ie ef0 could have aa.ddd.eee.16/28 ef1 aaa.dd.ee.32/28 and so on. > route add aaa.ddd.eee.17 ef0 -netmask 255.255.255.240 > (ditto for the remaining subnets) > On a similar line, if you did have a subnet attached to the same network segment could you use an ifconfig alias to use the same card in a machine for more than on subnet? Anyone? Jan