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Increasing available IP address on Windows SBS 2011 Stand

Posted on 2014-01-03
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Last Modified: 2014-01-03
Hello all. We have a small - Windows SBS 2011 Standard - network at a church using most of the 240 IP scope I've set up, internally. Currently at 192.168.0.1 (router IP) and 192.168.0.3 being server and DNS. We have several really large events here on campus - 1500 to 2500 attendees every year, with the majority of those attendees hitting the internet during the event. Obviously I'm running out of IP's. What is the easiest way for me to increase available IP's? I have all printers setup with reservations via MAC on the server. Everything thing else other than the router, is all DHCP.
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Question by:Houston Blancett
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by:Zephyr ICT
ID: 39754224
The easiest and maybe only solution would be to change the subnet so that you have more IP-addresses available, for the moment I'm guessing you have a /24 network (255.255.255.0)? Change it to something like /20 or /21.

I'm just wondering if that SBS server can handle the load though, though maybe not all 1500 will be hitting the Internet and using the DHCP/DNS of that server?

Could you set up a separate network for the events, kinda like a guest network, with separate routers and such (wifi or other)??
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by:Houston Blancett
ID: 39754237
Unfortunately most of the users for those events (concerts) are hitting the internet via the 2 WAP's I have in place. Would I have to have routers/WAP's that require the ability to handle multiple IP configurations?

So I would change the subnet to 255.255.252.0?
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Zephyr ICT earned 500 total points
ID: 39754257
Would I have to have routers/WAP's that require the ability to handle multiple IP configurations?

If you want a complete separate guest network you'd need AP's that have dual-band, or in other words the possibility to set up a guest network yes ... Then you can either work with separate switches or VLANs to separate the traffic.

If you want to keep the current setup without the separate network you can change the subnet to 255.255.248.0 or 255.255.240.0, that will give you plenty of ip-addresses, don't forget to change it for all the network devices.
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Author Closing Comment

by:Houston Blancett
ID: 39754263
Thanks for your solution! I believe that will work best for us!
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by:Zephyr ICT
ID: 39754277
What I forgot to mention, but maybe you know, the network will look something like this after the subnetmask change:

Network                                                                   Broadcast Address
                                  from                    to
192.168.0.0      192.168.0.1      192.168.15.254      192.168.15.255
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by:Houston Blancett
ID: 39754304
Got it...Thanks!
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