fortinp@bwdls56.bnr.ca (Pierre Fortin) (04/26/91)
In article <8693@idunno.Princeton.EDU>, tengi@princeton.edu (Christopher Tengi) writes: |> In article <642@smosjc.UUCP>, lapyun@smosjc.UUCP (Lap Yun Yau) writes: |> |> We just registered our Internet address and are now planning for reorganizing |> |> of all networks within the company. |> |> |> |> [...stuff deleted...] |> |> I would also like to suggest a method of subnet numbering that |> will give you some flexibility if you should find that you guessed |> wrong on the number of subnets/number of hosts. Start your host |> numbering on each subnet starting with the lowest binary bits and |> "counting up," yielding a sequence of: 1,2,3,4.... For the subnet |> numbers, start at the highest binary bit and "count down." If you |> were giving an entire octet (or at least the upper bits of one) to the |> subnet part, the sequence would be: 128,64,192,32,160,96.... This |> scheme will leave you with a "hole" in the middle, so that if you need |> to shift the mask, you will have a minimum of host renumbering to do. This is exactly what we've done on our network. With _over_ 255 subnets, it gets interesting: the very first subnet (net.128.0+host.host) now has a similar subnet (net.128.128+host.host). The real issue beyond this is scalability... Many people are looking at OSPF to solve their routing in the future; but if you've done as we have, and your network has grown to be very large, moving to OSPF (with its concept of areas) should prove to be an interesting challenge. I for one am still happy with our setup, but am seriously concerned that there is such a push to OSPF. In my case, I do not relish the thought of renumbering 95% of my hosts to take advantage of OSPF's concept of areas. OK, now that I've pulled the pin and tossed out the grenade... :^) :^) |> |> I hope this helps, |> /Chris |> |> ==========----------==========---------+---------==========----------========== |> |> UUCP: ...princeton!tengi VOICEnet: 609-258-6799 |> INTERNET: tengi@princeton.edu FAX: 609-258-3943 |> BITNET: TENGI@PUCC -- Cheers, Pierre Fortin fortinp@bnr.ca (613)763-2598