Window 2008 R2 DHCP setup for /21 subnets

I have a 2008 r2 domain server that I am setting up separate client DHCP scopes. One for regular wireless network and one for the guest network. I followed the same process to create both but they both created differently when viewed in the DHCP
mgmt interface. The .40 is working, the clients grab the next available IP and they are off. The .50 is not working correctly or the same way. See detail below.
I created a Scope for the wireless network clients 10.100.40.0 /21 Range 10.100.40.1-47.254 subnet mask 255.255.248.0 The
scope created as a super scope and added scopes .40 .41 .42 .43 .44 .45 .46 .47 (all as separate scopes under the super scope) for distribution which is accurate according to the subnet calculator. I excluded 40.1-10. It works! clients fill up
.40 and move to .41 etc. Statistics total scopes 8, total addresses 2023, in use 874, available 1149.
I created a scope for the guest wireless network clients 10.100.50.0 /21 same way! Range 10.100.48.1-55.254 (according to the subnet calculator)
subnet mask 255.255.248.0 The scope created as a regular scope 10.100.48.0 /21 starting address assigned is in the 48 subnet. I excluded 10.100.50.1-10. Statistics total scopes listed none ( no line), total addresses 2036, in use 262, available
1774.
I would prefer they both be set up the same way and functioning. As I said earlier .40 is working great! but .50 seems to have some .48 clients, 3 49 clients and a small group for 50 starting from the exclusion. I am not sure it is working
correctly ... I have had several people tell me that they are not able to grab an IP on the guest network. I have tried to recreate several time with out any different results.
Anyone have any ideas why .50 is different and what I could do to fix this? Thanks! chabo
chabt

Hi chabt,
Based on your description, I suppose that when you use
New Scope Wizard to create the super scope, you choose 24 in the
Length edit of Configuration settings that propagate to DHCP Client, that is to say, the subnet mask is 255.255.255.0. Then the New Scope Wizard will prompt you create a superscope because the address range you specified is
too large for a single scope. If the subnet mask is 255.255.248.0, it won’t prompt you create a superscope.
About the Statistics displaying, please try to restart DHCP server to see if it can display normally.
About the problem that several users couldn’t obtain an IP address, because other users can get IP addresses, please check if they match the policies on your guest network.
Also, please check the DHCP logs to see if the DHCP server logged any related logs. Such as, you could find if the lease was denied, or if the DHCP server received the DHCP request or other useful information.
The dhcp logs are stored in %windir%\System32\dhcp. Please ensure that the DHCP server enabled audit logging.
To enable DHCP audit logging, in the DHCP console, right click
IPv4, click Properties, in the General tab, check “Enable DHCP audit logging” checkbox.
For more details about DHCP audit logging, please refer to the article below,
More About DHCP Audit and Event Logging
http://technet.microsoft.com/en-us/library/dd759178.aspx
Best Regards,
Tinac

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