We help IT Professionals succeed at work.

Engineering a new LAN IP Structure

Medium Priority
335 Views
Last Modified: 2012-05-11
Hi All,

I am looking at redesigning our private LAN ip structure. We have 26 sites and the subnets are arranged as 192.168.0.0/24. We have from 192.168.0.X - 192.168.26.X subnets.

We have approx. 100 - 150 devices on each subnet. I was thinking of introducing a CLASS A network.

So 10.0.0.0/8. The reason? I can use the second octet as a SITE ID, Third Octet as a CATEGORY ID (eg, servers, wireless, laptops, printers etc etc) and the fourth octet is range 1 - 254 for the devices themselves.

Now I like this as a clear identifier of subnets, eg, a wireless device isnt working on 10.151.60.1/8, I know this is site Silicon Valley(151), Wireless Device (60).

However, I am concerned that CLASS A is too large for only 150 devices or so in each subnet, is it overkill? What are the downsides of this in a technical level? Should I pursue a CLASS B instead? I am assuming that over the next 3 years we will grow by double, in which CLASS C will not be a viable subnet range.
Comment
Watch Question

We split down by category, but not at the level you are talking.. At the subnet mask you are talking the subnets would be huge...

How about this?

10.Global Region.SiteVlans.Device?

So for example;

Split world or country into 8 chunks (a /11 mask) - regions a-h or whatever you want to call them

So sites in Region A would exist between 10.0.0.0 and 10.31.255.255, B would be in 10.32.0.0 to 10.63.255.25

each site would become a /21 mask which would give you 8 .24 vlans on the site

So site A in region A would 10.0.0.0 to 10.7.255.255

Within Site A you would have your 8 /224 vlans for your device types

Helps?


I don't see any issue with this idea at all, they are after all just numbers available to use for whatever you need.

Author

Commented:
Well someone said that I shouldn't do it with class A because if I need to VLAN a segment, I need to use an entire different IP scheme, either 172.16.x.x or 192.168.x.x.

Also, he was concerned that Class A would permit more chatter on the network, though what difference does CLASS A and B have to do with chatter if there are only 150 or so devices on the subnet anyways.

I mean, you need to reach approx. 500 devices before you think of segmenting right?
Unlock this solution and get a sample of our free trial.
(No credit card required)
UNLOCK SOLUTION
Commented:
Unlock this solution and get a sample of our free trial.
(No credit card required)
UNLOCK SOLUTION

Author

Commented:
Thanks. Obviously I need to use /16. Not sure why I thought /8 was the best solution, its obviously not.

Thanks guys.
Unlock the solution to this question.
Thanks for using Experts Exchange.

Please provide your email to receive a sample view!

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.