Date: Thu, 24 May 2012 11:19:54 +0000 From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: sthaug@nethelp.no Cc: rizzo@iet.unipi.it, net@freebsd.org Subject: Re: use of non-contiguous masks in address lookups ? Message-ID: <98091B3E-B728-483F-99FE-C65BD82CA089@lists.zabbadoz.net> In-Reply-To: <20120524.094321.74735847.sthaug@nethelp.no> References: <20120524071055.GA50710@onelab2.iet.unipi.it> <20120524.094321.74735847.sthaug@nethelp.no>
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On 24. May 2012, at 07:43 , sthaug@nethelp.no wrote: >> every now and then the issue comes up on whether we still need >> to support non-contiguous masks in address lookups. >> I seem to remember someone (perhaps on this list) making a >> case for their presence, but forgot the details. >> So, does anyone know of a practical use of non contiguous masks ? > > I vote for removing non-contiguous masks. They are incompatible with > CIDR, which was introduced in 1993 (!). > > Non-contiguous masks have been unsupported in many routers produced > the last 10 years or so. Contrary I still know people using them and relying on it. Not sure on which version they are. I am not quite sure what micro-optimizations on legacy IP will help us after a decade or longer. Let it rest and die gracefully the next years. Of course, fixing bugs still considered good:) /bz -- Bjoern A. Zeeb You have to have visions! It does not matter how good you are. It matters what good you do!home | help
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