Getting Wireless Users onto LAN

Question

Hello All,
We currently purchased 2 AP's and a 2106 WLC and I am having some trouble getting the wireless users to communicate to the network on the other side of the WLC. Here is a very simple diagram on how this is all connected.
3750X L3 Switch --> 2106 WLC --> AP
LAN Network - 10.10.0.0/16           Wireless Users Network - 10.100.21.0/24
So with a laptop, I can get a DHCP reservation from the WLC to the 10.100.21.0/24 network. From there though, I cannot ping anything in the 10.10.0.0/16 network. I know that I am talking across two different networks so by default they shouldnt be able to communicate, but I feel like I am missing a setting on the WLC that will allow the two networks to communicate.
Management Interface:
IP Address: 10.10.20.100
Netmask: 255.255.0.0
Gateway: 10.10.0.1
DHCP Info: 10.10.20.100
Here is the config for my test interface (which may be the problem):
IP Address: 10.100.21.2
Netmask: 255.255.255.0
Gateway: 10.100.21.1
DHCP Info: 10.10.20.100
Thanks in advance for taking a look.

Answer 1

Hello George,
Thanks for the reply. I believe I have routes that allow both these networks to talk, currently we are redesigning our network so bear with me as the setup is a little goofy.
The way our devices are connected in terms of the wireless configuration:
Internet <-> ASA <-> 3750 switch <-> WLC <-> AP <-> Laptop
                                      |
                                  My PC    
So, currently our default gateway for our LAN (10.10.0.1) is the inside interface of the ASA (like i said, working on changing this). On the ASA I also have a static route configured so any traffic destined for 10.100.21.0/24 send to 10.10.20.2 which is our 3750 Switch.
On the 3750 switch I set a default gateway for our wireless network of 10.100.21.1. I also configured the trunk from the post above so there is a trunk between the 3750 and the WLC allowing the LAN VLAN and Wireless VLAN to send data across it.
On our WLC I have this configured:
Management Interface:
IP Address: 10.10.20.100
Netmask: 255.255.0.0
Gateway: 10.10.0.1
DHCP Info: 10.10.20.100
Here is the config for my test interface (which may be the problem):
IP Address: 10.100.21.2
Netmask: 255.255.255.0
Gateway: 10.100.21.1
DHCP Info: 10.10.20.100
From my LAN I can ping 10.100.21.1
Our host on the wireless can get an IP, but when it attempts to ping anything (even its gateway) i get no replies.
Going back to your question of if we have routes for both networks to talk, I believe we do, unless I am missing something.
Thanks again for your reply and taking the time to look at this.