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Wireless Issue with multiple DHCP

Greeting All

We have two wireless SSID: One Corporate and one SSID for guest

The wireless corporate has an SVI X that exist on the core network and the guest is only layer 2 that connects to a firewall which provides the DHCP service

The issue that we have is if we disbale DHCP proxy on the WLC , the guest is working just fine and user can get IP address through the firewall however the corporate wireless is not working anyone.

In the other hand if we enable the DHCP proxy on the WLC , corporate Wireless is now working fine and user can get an IP but this time the Guest SSID is not working anymore ;(

Anyone know what is the issue and if i`m missing something.... why the WLC can`t support multiple DHCP (i tested the dhcp and they work fine ).

Thanks Team