I have a WLC 5508 with a management IP interface (192.168.50.253/24)
I've also an IP interface for a guest WLAN (192.168.100.253/24) and an IP helper configured (192.168.50.100)
A Windows DHCP server distributes IP addresses for the Guest WLAN (192.168.50.100)
As the guest WLAN is managed by an UCOPIA captive portal (which is the gateway for all clients, 192.168.100.252), I don't have an IP interface for this VLAN on my core router. Because, if I build a 192.168.100.254, my guests can use this IP address as gateway in their routing table and bypass UCOPIA.
So the question :
My controller IP interface for the guest vlan must have a gateway on the 192.168.100.0 network.
- When I put 192.168.100.254 (the core router, with this interface up), clients obtains an IP address via IP helper from DHCP server. But they can bypass ucopia.
- When I delete IP interface on the core routeur, clients cannot obtain IP address from DHCP server.
I don't know why because the IP helper is 192.168.50.100 which is a server on a directly connected interface on the WLC 5508 (management if)
Is it mandatory to have a valid gateway IP for the controller vlan interfaces ?