RE: [suse-linux-uk-schools] address ranges
See, there you go, adding in the modern good practice details... Maybe I should have mentioned that our subnets are used to divide classrooms, types of classrooms, types of device and security levels of device. If Cisco had come through with the VMPS module for our core switch, we'd have been using subnets and vlans for even more security - would have made our VOIP setup easier to handle too... BTW Andrew, are you still in contact with your colleague who returned to teaching? I thought we could get him interested in Schoolforge-UK. (Even more) BTW, have you heard the rumours about the new R1200 engine - 20kgs lighter... -----Original Message----- From: Andrew RAY To: suse-linux-uk-schools@suse.com Cc: DGG@wellington-college.berks.sch.uk; chris@centralmanclc.com Sent: 9/15/03 3:09 PM Subject: RE: [suse-linux-uk-schools] address ranges I agree with Chris, but I'm surprised that, as yet, no one has looked at the reason for sub-netting. Just 'because it exists' is a bad reason. A good reason is where discernible groups need access to peculiar resources. These could be: a) A particular server/servers (could be special mail/file-print/proxy servers for the group of machines on the sub-net). b) Specific network printers. c) Other special shared network resources (web-cam; PLC control technologies(!!); robots; turtles etc etc). By sub-netting and locating the identified resources on the appropriate sub-net, then access is made very easy for those who share that sub-net, but not necessarily denied to less frequent users who may live on another one. In this way, each sub-net can concern itself with the resources which are *predominantly* for its users, and in a way which is commensurate with this, the network traffic is *generally* limited to those switches / routers (depending upon the methodology used on your physical network) that deal with the identified sub-net. By planning network resources around places of need, essential sub-net divisions should really present themselves. It is these that then become 'categorically' good things. Hope this helps further. Andrew
The use of subnets is categorically a good thing; this prevents broadcast traffic from slowing the network down and is a useful way of providing QoS - the downside is lag between subnets if you use a router rather than layer 3 switching. You also need to provide services to resolve netbios names e.g. WINS, and have a method of providing DHCP support.
We use layer 3 to support 20+ class C and below subnets without any issues (W95/8,NT, 2000, XP, Linux, Unix). What concerns do you have on his behalf?
Chris
-----Original Message----- From: Grainge, Derek To: suse-linux-uk-schools@suse.com Sent: 9/15/03 9:47 AM Subject: [suse-linux-uk-schools] address ranges
A colleague (a real colleague not me pretending!) has a network which has grown like topsy. It consists of 8 class C addresses covering 192.168.0.0 - 192.168.7.255 He's operating a mixture of platforms including the odd linux server but a number of W2000 ones.
I think he should take the time and trouble to use a single class B range instead. Can any network guru tell me - is it a) necessary or b) desirable?
Thanks in advance, Derek
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Chris Puttick