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- Newsgroups: comp.protocols.tcp-ip.domains
- Path: sparky!uunet!spool.mu.edu!uwm.edu!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!nucsrl!ddsw1!karl
- From: karl@ddsw1.mcs.com (Karl Denninger)
- Subject: Re: Why not automatically do reverse domains?
- Message-ID: <C05ECB.Fxr@ddsw1.mcs.com>
- Date: Thu, 31 Dec 1992 23:52:58 GMT
- Distribution: inet
- References: <BzvrG3.6t4@boulder.parcplace.com> <C033uA.7CB@ddsw1.mcs.com> <1ht11rINN24d@daisy.ee.und.ac.za>
- Organization: MCSNet, Chicago, IL
- Lines: 26
-
- In article <1ht11rINN24d@daisy.ee.und.ac.za> barrett@daisy.ee.und.ac.za (Alan P Barrett) writes:
- >In article <C033uA.7CB@ddsw1.mcs.com>,
- >karl@ddsw1.mcs.com (Karl Denninger) writes:
- >> The other pathological case in which this is bad news is where the subnet
- >> mask is not a byte-boundary. Consider the following (ACTUAL case from my
- >> site):
- >>
- >> 192.160.127 - Class C address assigned to my domain (MCS.COM)
- >>
- >>Subnet mask used here: 255.255.255.128 -Note the odd alignment!
- >
- >Note the illegal subnet mask. You have only one bit for the subnet
- >number, which means that you can have only two subnets, numbered 0 and 1.
- >But subnet <all bits zero> and subnet <all bits one> are reserved
- >[RFC1009, section 1.1.4] [RFC950, section 2.1]. So you don't have any
- >non-reserved subnets.
-
- Hmmm... point made. It works as expected however, which is more than a
- little odd. (;-))
-
- (Been a while since I've looked at RFC1009)
-
- --
- Karl Denninger (karl@ddsw1.MCS.COM, <well-connected>!ddsw1!karl)
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