Ideas on a network design?
Tim Keanini <blast@worldbit.com> Tue, 11 April 1995 04:45 UTC
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From: Tim Keanini <blast@worldbit.com>
To: rreq@isi.edu
Subject: Ideas on a network design?
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Hello, I am new to this list and if my posting here is not the interests of this mailing list please let me know so that I may take my question elsewhere. Here is my (long) post to share with you all: We have a network that is 'Flat'. There are two buildings and about 400 or so employees. We have a Kalpana Ether Switch that helps us distribute the network bandwidth. The network primarily is a mature IPX and Appletalk network. +-----------------------------------------+ | Kalpana ETher Switch | |1st 2nd 3rd 4th 5th 6th | +-+------+------+------+------+-------+---+ | | | | | | | | | | | | | | | | | | HUB HUB HUB HUB HUB HUB Connection 1 through 5 are being used for IPX and Appletalk traffic. The network connections 2 and 5 going to Novell servers in FULL DUPLEX mode. Here is my problem. I now have to route IP in my internal network and I am going to have to stick IP routers on the internal LAN. In the Ether Switch manual, they show the solution like this. If you network used to look like this: BEFORE router router router | | | ----------------------------------------------------------------------- | | | router router router AFTER +---------------------------------------------+ | Kalpana ETher Switch | |1st 2nd 3rd 4th 5th 6th | +-+-------+-------+-------+-------+-------+---+ | | | | | | | | | | | | | | | | | | router router router router router router The idea here with Kalpana is that via the Ether Switch, each port will get its share of the ether speed since it routes on the first 64k. Well, if I have to buy 6 routers, I will limit the growth of the network because if I dont buy routers that have all the snappy feature that the IPX and Appletalk network people want(ie full duplex, 100mbit etc.etc.) (I am not sure if I am being clear here but stay with me) So, this is that I am going to do to make everyone happy. +---------------------------------------------+ | Kalpana ETher Switch | |1st 2nd 3rd 4th 5th 6th | +-+-------+-------+-------+-------+-------+---+ | | | | | | | | | | | | | | | | | | HUB HUB HUB HUB HUB +--+-------------+ | HUB | + +--+--+--+--+-++ | | | | | \_router to intenet | | | | | +------+--+--+--+--+-----+ | 16 17 18 19 20 | | | |PC with 5 ethernet cards| +------------------------+ This PC is running UNIX with IP forwarding in the kernel. It has 5 ethernet card that are on networks xxx.xxx.16.0 though xxx.xxx.20.0 The internet router sits on the xxx.xxx.16.0 network and routes out to the internet via a firewall. Please forgive me if this diagram looks silly but it all started when I was just going to get my block of class C's, x.x.16.0, x.x.17.0, x.x.18.0, x.x.19.0, x.x.20.0, x.x.21.0, x.x.22.0, and x.x.23.0 networks and pop them on a supernet but masking with 255.255.248.0 and a broadcast of xxx.xxx.23.255 Well, to my suprise, there are a lot of IP stacks on PC's that will not let you supernet like this with a block of class C's If all my internal hosts were UNIX machines, I would be set but they are mostly Macs and Windows machines. So that is the method to my madness. That is the reason that I have 5 ethernet cards all with a 255.255.255.0 mask. The basic idea really is that all IP routing will happen on the 6th channel of the ether switch. If anyone would like to talk to me about this, please mail me. I am no network guru and would like to share this idea with some who has setup a network with some of the same problems that I face. If the problems that I face are not clear, write me and I will try and make my examples clearer. --blast %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \ Tim Keanini | "The limits of my language, / / aka blast | are the limits of my world." \ \ | --Ludwig Wittgenstein / / | \ \ +================================================/ / for more info on BayMOO... \ \ email baymoo@worldbit.com <blast@crl.com> / %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- Ideas on a network design? Tim Keanini