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Network and Classroom Management Thread, Internal Private IP Address Range, Need Advice! in Technical; Hi. Need some advice guys. I work for the local LEA in a school. as you can image we are ...
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    phillip_croxford's Avatar
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    Question Internal Private IP Address Range, Need Advice!

    Hi.

    Need some advice guys.

    I work for the local LEA in a school. as you can image we are on a 10.X.X.X private address range and on a subnet of 255.255.255.0 giving me 254 IP addresses for our school.

    Now here is the problem I'm having:
    I have implemented a new wireless solution but the problem is with various gadget and devices that are connecting to my network taking up most of these addresses.
    I want to know if there is anyone out there who is in a similar situation as me,
    I really do not want to ask our LEA networks team for another IP address range giving me another 254 address

    I want to be able to manage my own IP and subnet range instead of going back to my LEA, can I create my own private IP address range on a subnet, say for instance 255.255.0.0, giving me more scope for IP address?

    what I don't want to do is create a private address that will cause conflict not only for us but for the LEA too. can this be done? or will I have to go through the LEA Networks team.

    btw im running a W2k8 R2 Server environment with with a dedicated server dishing out DHCP & DNS
    Windows 7 clients with mixed android and ipad devices

    any help appreciated

    thanks

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    foofighterjim's Avatar
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    In order to run your own address range without causing disruption you need to implement NAT. You LEA may or may not support this, you may have to request a new IP range, I would also suggest getting off the 255.255.255.0 subnet and onto at least 255.255.248.0 to cover for future expansion. You can calculate what subnet would suite here.

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    phillip_croxford (10th July 2014), speckytecky (11th July 2014)

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    Michael's Avatar
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    The odds are you're connected to some form of intranet, so I wouldn't change anything without consulting them first. Worse case scenario is you create a conflict with another network bringing yours down (depending how everything's controlled/managed).

    In your case probably the simplest way is to tweak the subnet mask to either:

    255.255.254.0 giving you 510 IPs or 255.255.252.0 giving you 1024 IPs.

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    phillip_croxford (10th July 2014), speckytecky (11th July 2014)

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    phillip_croxford's Avatar
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    that's exactly what I thought Michael.

    I know within our LEA some of the schools I've been to have a similar IP address and subnet range, so didn't want to conflict with others
    sorry to sound dumb, but if I did change the subnet wouldn't that (disrupt / conflict) my network / internet??

    networking isn't my strong point btw lol

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    IrritableTech's Avatar
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    If your LEA has allocated IPs with a view to schools expanding, you may be able to do what @Michael suggested with their approval. It means you change the subnet mask, but you don't have to re-ip everything.

    My former LEA provider did not do this, and we had to re-ip everything when we ran out of addresses. Not a massive issue as long as you plan well.

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    phillip_croxford's Avatar
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    @Michael, I totally get what you mean now! thanks to @IrritableTech

    More than likely I will see if I can change the subnet mask with my LEA. failing that it looking more like another IP address range and super scoping them both together!

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    Michael's Avatar
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    Anything that's DHCP'ed (as it were) will pick up the new subnet mask you configure. Everything with static entries are more of an issue, but could easily be achieved out of hours.

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    localzuk's Avatar
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    You may be able to retain your old IP range and get a new range too. We have that here, both ranges assigned by our LEA. They just updated the edge router to accept the traffic from both ranges.

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    I'm in the same boat. /24 subnet mask and starting to run out of addresses. Noob question. Why do we have to use countys internal IP range? Why can't the router have the 10.0.x.x etc address and then NAT to the whole school and use what ever address scheme we want?

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    Michael's Avatar
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    I'm sure if you go through the right channels, additional IPs can be allocated by simply tweaking the subnet mask (easiest way).

    As I say, for most Primary schools a 255.255.252.0 subnet offering 1024 IPs should be suffice.

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    foofighterjim's Avatar
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    Quote Originally Posted by PatrickC View Post
    Why do we have to use countys internal IP range? Why can't the router have the 10.0.x.x etc address and then NAT to the whole school and use what ever address scheme we want?
    This is exactly what we had at my previous school, we could run any IP and subnet we wanted because it was all internal and NAT took care of the external. I had quite a shock when I came back into the Birmingham way of things!

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    Michael's Avatar
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    Quote Originally Posted by foofighterjim View Post
    This is exactly what we had at my previous school, we could run any IP and subnet we wanted because it was all internal and NAT took care of the external. I had quite a shock when I came back into the Birmingham way of things!
    Well yes and no, have you run out of IPs at a Birmingham school? I haven't as yet, not even close.

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    Why use their addresses internally anyway? There must be a reason why they don't use one public address then NAT with private internal addresses. Is it for easier remote access to servers?
    Last edited by PatrickC; 10th July 2014 at 03:57 PM.

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    localzuk's Avatar
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    Here we use the provided addresses so that our local SIMS team can remotely connect in using their tools to support our SIMS users. Switching to a different range would make things more difficult. Its the same in various other areas.

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    phillip_croxford's Avatar
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    i would have thought it be something to do with remote gateway to access the servers remotely

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