Re: Noob basic network segmenting help

Phillip Windell wrote:
"£Jim" <nospam@xxxxxxxx> wrote in message news:eUO%23Ss2mJHA.1288@xxxxxxxxxxxxxxxxxxxxxxx

I would like to break down the existing network in our building into a subnet per floor to allow more hosts and more management of traffic

If I put a router on each floor for each new subnet what are the implications for DHCP, domain controllers, etc? How does a host on one subnet get a DHCP address in the correct range from a domain controller on a different subnet?

It'd be cheaper to use one Router with enough Interfaces for each segment.

The number of segments should be tied to how many clients you have,...not how many floors you have,...floors are irrelevant. Do one segment for every 200+/- hosts.

Ethernet begins to degrade around 250-300 hosts,..so keep a simple /24 mask (255.255.255.0) which gives the perfect size of 254 host.

A good way to have a multi-interface Router is to buy a Layer3 Switch and group the ports into "interfaces" associated with each segment. Do it as a "hub and spoke" design with the Switch/Router as the logical "center".

DHCP is a no-brainer. Create a *regular* normal Scope for each subnet. No superscopes!!! Then configure the DHCP Helper address(s) on the Router so that the router forwards the DHCP Queries to the DHCP Server. That's it,...there is nothing else with the DHCP.

Don't know of any documentation. This is just too "typical" for any documentation to come to mind. It's like asking for documentation to "cross the street". I think the most complex part for you will be documentation for whatever Switch/Router you buy,...and that may get a bit complex.

Thanks. Floors is just a convenient way for me to identify hosts quickly and allow for expansion, but I like the idea of a single L3 switch. Any recommendation for a management priced box that could do it?

So the DHCP is smart enough to hand out the right subnet addresses then, that's good.

Bit of a harsh comment on the documentation ;) We all have to learn somewhere. I'm not averse to reading howstuffworks or dummies...
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