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New Member

2504 WLC and 1142n LWAPs and DHCP issues

Hi,

We are trying to connect 1142n lightweight APs with the 2504 WLC. We have successfully joined the APs to the WLC by configuring the switchports hostings the APs to be in access mode in the same VLAN as the management interface of the WLC. However, we would like the wireless clients to be assigned to different VLANs based on which SSID they connect to.  We have configured a dynamic interface to support the first SSID/VLAN and assigned it the appropriate VLAN id. Clients are able to associate to the AP however they do not receive an address from DHCP. We want the clients to receive addresses from external DHCP servers, which are also providing wired clients addresses within the same network/vlan.

We attempted to configure the APs with the static address of the WLC (10.10.50.5) and statically set the APs address inside the VLAN (172.22.134.101). Routing is functional between the 172.22.134.x network and the WLC, and the APs were able to reconnect to the WLC in this configuration. Unfortunately, clients are no longer able to associate to the APs. So we have returned to the configuration above, but still are unable to address the clients using DHCP.

Thanks in advance,

Dave

5 REPLIES
Cisco Employee

2504 WLC and 1142n LWAPs and DHCP issues

#Best practice: AP should have ip on WLC's management vlan L2 or any L3 network that is not part of dynamic interface of WLC.

#Is ext dhcp reachable from trying wlan mapped vlan

#Did you configure primary/sec dhcp server on the interface where the WLAN is mapped to.

#ping wlc interface from dhcp server

#by default dhcp proxy is enabled on wlc, toggle this based on your dhcp server requirement.

#capture the output. WLC>debug client , & debug dhcp message enable

#create internal scope on wlc as temp workaround

New Member

2504 WLC and 1142n LWAPs and DHCP issues

Thanks for your help Saravanan,

In answer to your suggestions: Pings between the WLC and the DHCP server are successful.

Primary external DHCP server has been configured on the WLAN.

We have toggled between DHCP proxy and back without success on either setting.

We are able to receive DHCP addresses by creating an internal scope. The addresses we are distributing from the internal scope are on the same network (VLAN 1, 172.22.134.0/24) which we want the external DHCP server to be providing them from. Unfortunately, pings to the DHCP server from the wireless clients still do not work even though they are addressed in the same network as the DHCP server. Therefore, we think that the controller is not assigning the clients to the correct VLAN to allow these pings to succeed.

Cisco Employee

2504 WLC and 1142n LWAPs and DHCP issues

Ping req from wlc destined to any ip always goes out using management interface of wlc  as source.

Unfortunately, pings to the DHCP server from the wireless clients still  do not work even though they are addressed in the same network as the  DHCP server.

#why did you ping without having an ip on wireless client.

#Connect a wired pc to the WLC connected switch's access port vlan and see it gets an ip from dhcp server, if not then it is config issue on wired side.

#what's the client debug output.

New Member

2504 WLC and 1142n LWAPs and DHCP issues

Thanks for your help, Saravanan. The issue we were having was related to the trunking native VLAN. We wanted to address our clients in VLAN1. After changing the native VLAN on the trunks, the issue has been resolved.

Thanks again for your help,

Dave

Cisco Employee

2504 WLC and 1142n LWAPs and DHCP issues

that's cool.

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