North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Question about subnetting /24's
At 08:42 PM 3/18/99 -0500, Scott Gifford wrote: >I have a /24 network I want to subnet into two /25's. For realism's >sake, let's call the network > > 216.40.155.0/24 (mask 255.255.255.0) > >So I have two 126-host networks, namely > > 216.40.155.0/25 (mask 255.255.255.128) > 216.40.155.128/25 (mask 255.255.255.128) > >The person with whom I was calmly discussing the matter said that this >configuration didn't make any sense, because my first subnet had all >zeroes in the last octet, so it was an all-zeroes subnet; and the >second had all ones on the last octet, so it was an all-ones subnet. >And that these subnets were reserved as the network subnet, and the >broadcast subnet, much as all-zeroes and all-ones in the host portion >indicate the network and broadcast addresses. He is correct for "classful" networking. If you run classless IP, his comments are irrelevant. >Both myself and the customer are using Bay Networks routers. Ahhhhhh. I see your problem. :p > If anybody else is interested in this, let me know, and I'll >summarize direct responses to the list. I'm afraid that most people here know better. But thanx anyway. >------Scott. TTFN, patrick I Am Not An Isp - www.ianai.net ISPF, The Forum for ISPs by ISPs, <http://www.ispf.com> "Think of it as evolution in action." - Niven & Pournelle
|