Subnet Routing

[ascott2]

We are currently having an issue with our county assigned addresses as in we are running out on the curriculum side. We have 10.81.82.0 -10.81.83.255 on the curriculum(255.255.254.0 subnet) and our admin has 10.81.84.0 - 10.81.85.255(again a 255.255.254.0 subnet) on a separate VLAN. We have 2 windows 2003 domains one on each VLAN range.

 

We are running out of curriculum IP addresses but our admin have plenty free. I was wondering what would be the easiest way to address this? I was thinking about taking the top half of the admin addresses ie 10.81.85.xxx as they aren't really needed. Could I readdress the curriculum as a 255.255.252.0 subnet and just block reserve the 84.xxx so we have no duplicates (ACL allows for some crossing over VLANs). Or do I create a separate 255.255.255.0 subnet with the .85.xxx addresses and route the two subnets at the switch? We have a procurve 5412zl if that helps?

 

Current IP setup:

Curriculum

10.81.82.0 - 10.81.83.255 (255.255.254.0)

Admin

10.81.84.0 - 10.81.85.255 (255.255.254.0)

 

My Aim

Curriculum

10.81.82.0 - 10.81.83.255

10.81.85.0 - 10.81.85.255

 

Admin

10.81.84.0 - 10.81.84.255

 

If I'm not making sense, let me know and I can try explain myself a little clearer.

 

Thanks in advance

[Kipling]

Unless you have a specific reason to use the county range you could just abandon it all together and use an internal range of your own (192.168 or 127.16 etc)

[ascott2]

I would be looking to stick with their range for various reasons but have thought about moving printers etc over to an internal range to free up some space but that would be a temporary solution.

[SYNACK]

You should do it as contigious subnets so go with completely seporate routed subnets or move the clients around the address space so that the ranges remain contigious. You may also want to contact the LEA and inform them of the changes because the admin network may have differnt rights, internet etc that you don't want the student to have.

[matt40k]

Does your county allow you to route between the two VLANs? Suppose you could put printers\servers on the admin side to free a few up, again, assuming the LA would let you.

[featured_spectre]

Why not change the subnet range and IP scheme all together. Unless there is a legacy reason or an LA stipulation that you have to stick with what they have given you, why not change it?

[eduabncs]

Why not change the subnet range and IP scheme all together. Unless there is a legacy reason or an LA stipulation that you have to stick with what they have given you, why not change it?

 

As long as you can give good reasons most RBC/LA will allow you to expand your IP range. This may involve a change of your host range though, as the host range you are currently using may have others schools sitting in the IP block you wish to expand into, so the RBC/LA will move you to a new range that is free for the subnet you require. As this is a lot of work for both the RBC/LA and school side, here in Brum we do this kind of change over school holidays.

 

At the end of the day ask you LA team how best to resolve the IP issue you are having, as they are best placed to advise and help.

[glennda]

As long as you can give good reasons most RBC/LA will allow you to expand your IP range. This may involve a change of your host range though, as the host range you are currently using may have others schools sitting in the IP block you wish to expand into, so the RBC/LA will move you to a new range that is free for the subnet you require. As this is a lot of work for both the RBC/LA and school side, here in Brum we do this kind of change over school holidays.

 

At the end of the day ask you LA team how best to resolve the IP issue you are having, as they are best placed to advise and help.

 

As said above - my lea allowed this to happen at my last place giving us near enough an extra thousand addresses

[ascott2]

Just to let all you guys know. We have been allocated an extra /23 batch of addresses from county. We have added the allocation to our VLAN, and as the range is non contigeous created a DHCP superscope on our Windows server. All is well :-)