topic Cannot get ip address from remote dhcp in Wireless

Cannot get ip address from remote dhcp

interfacedy — Sun, 04 Jul 2021 18:17:56 GMT

Please see the below diagram. WLC9800 is connected to the router via vlan20 and AP is connected to the router via vlan200. AP is joined to the wlc. The client can get ip address if dhcp server is configured at the wlc as internal. But the client cannot get ip address if a dhcp server is connected to sw2 even if ip helper-address is set at the wlc and pointed to the dhcp server. Any suggestions? Thanks

Vlan20 vlan200

WLC ----------- sw1 ---- Router -------------sw2------- AP . . . . . . client

Re: Cannot get ip address from remote dhcp

balaji.bandi — Sun, 04 Jul 2021 18:33:52 GMT

As Long as DHCP reachable Client should get DHCP IP address from DHCP Server, is the DHCP Server ( MS ?) what DHCP Server ?

what is the Logs shows ?

Re: Cannot get ip address from remote dhcp

MHM Cisco World — Mon, 05 Jul 2021 13:07:40 GMT

the Mode of WLC handle the DHCP is different,
bridge mode make WLC re-send the broadcast and this need ip helper if the DHCP server in different VLAN and client
Proxy Mode make WLC generate unicast toward the DHCP server, no need for ip helper.

I think you use bridge without the ip helper in Router.