Question

How do I configure DHCP for two WLAN's on Cisco 2100 Wireless LAN Controller?

Asked by: sfjcpu

I have a Cisco 2100 Wireless LAN Controller with three Cisco 1130 Lightweight Wireless Access Points. I have two WLAN's configured on this wireless system, with one being on the same VLAN/Subnet as the rest of the network (private), and the public side being on VLAN 20 (public). Two of the AP's are connected directly to the WLC, while the third is connected to a Cisco switch.

I'm trying to get DHCP configured on both WLAN's. It's working on the private side, but not on the public side. I've double-checked my configs and made sure there's communication between the access points, DHCP server, and WLC using ping. There are no access control lists implemented currently. My question is, do I need to put the public WLAN interface on a different physical port than the management (private) interface? As it is, I have both VLAN's/subnets going through the same physical port and only the management (private) interface is pulling DHCP IP addresses. I am currently using a Sonicwall to supply DHCP addresses.

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Asked On
2009-06-09 at 12:20:12ID24477033
Tags

Cisco Aironet 1130AG Series

,

Cisco 2100 Series Wireless LAN Controller

,

DHCP

,

Sonicwall

Topics

Wireless Local Area Network

,

Dynamic Host Configuration Protocol (DHCP)

,

Miscellaneous Networking

Participating Experts
1
Points
500
Comments
4

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Answers

 

by: nappy_dPosted on 2009-06-10 at 03:31:27ID: 24589655

You need to place a DHCP server into your Public vLAN.  The best thing to do is to just setup a simple box ti serve IP leases.

 

by: sfjcpuPosted on 2009-06-10 at 06:20:48ID: 24591083

Well the I have the Sonicwall pushing DHCP through the sub-interface on that VLAN so that would pretty much be the same thing. The access point gets a DHCP lease from it, but nothing connected to the WLAN can get one.

I've troubleshot a bit more and, if I add a DHCP scope on my main DHCP server for the subnet for that VLAN, and tell the WLC to get DHCP from that, then it works just fine even though that DHCP server is on a different VLAN/subnet. I'd rather not have to do that though, I'd rather get DHCP from the Sonicwall if at all possible.

 

by: nappy_dPosted on 2009-06-10 at 07:30:22ID: 24591890

Do you have port groups and trunking configured on your WLAP devices?

I do not have the WLC but my units are in autonomous mode and I config'd them for trunking to move devices to the corporate or guest vLAN after authentication.

is this how yours is configured?

 

by: sfjcpuPosted on 2009-09-10 at 08:59:28ID: 31590583

Solved the problem on my own, but your tips helped me figure out the workaround. Thanks!

20120131-EE-VQP-002

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