SBS2011 standard class A subnet workaround ?

Hello,

Reading through threads confirm that SBS2011 standard does not accept to manage a class A IP range.
Since more and more notebooks and mobile phones connect through DHCP we face some problems...
Is there a way to work around and get class A leases, keeping AD and DNS records under control ?
Could a member server be the DHCP server and cleanly fulfill SBSB2011 AD and DNS ?

Thanks in advance
SAJJITERAsked:
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Cris HannaSr IT Support EngineerCommented:
Since SBS 2011 is limited to 75 CAL's, I find it hard to understand that with a Class C subnet which gives you over 200 IP addresses how is that not going to work for you?
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Cliff GaliherCommented:
Technically the 192.168.0.0 space is a /16, although SBS defaults to a /24. You can easily change that. That is 65,000+ addresses. With device CALs, you *clearly* won't have that many devices (and can't legally.) And if you go the user CAL licensing, that gives each of the maximum 75 users over 800 devices each.

Plus, SBS supports the 172.16.0.0/12 space, which is even MORE addresses.

Short answer, if you are running short on addresses in SBS, there is something much bigger wrong here. You should look at why you are burning through that many leases or you should consider moving off of SBS.

-Cliff
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SAJJITERAuthor Commented:
Thanks Cliff,

Very good info. We are aware of the limits of SBS but are in a specific matter here.

If you can help a bit more, how should I set up SBS and DHCP to change from 192.168.0.0/16 to /24, or setup 172.16.0.0/12. If you prefer that could be the subject of another topic ?

Thanks again,

JJ
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Cris HannaSr IT Support EngineerCommented:
Either Cliff or I would be happy to help you sort this out, but what is you're desired endpoint.
Is the SBS server already up and running?  If so what is the IP schema currently in use?

If you simply change the Subnet Mask to 255.255.0.0 that gets you the 65000 plus addresses but again, there's no way in an SBS environment that you could legally use that many addresses
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