Cisco Wireless :: DHCP On WLC 5508 7.4.100.0 With HA
Jun 11, 2013
We've encountered problem from the last few days with DHCP on certain SSID's. We have a wireless network with 13 SSID's being managed by a WLC 5508 pair configured as high availability (52 AIR-CAP3502I). Yesterday we encountered an issue with DHCP on a few of the SSID's but not all, and as a last resort a reboot of the controller fixed the problem. Statically assigning addressing allows for traffic to traverse the network out to the web and back so I don't think it's a VLAN configuration issue on the wired side. It's worth mentioning however that the controllers are configured for a LAG to HP switches. DHCP is being handled by an external windows DHCP server and the primary server address points to the gateway which has a relay configuration pointing to the windows server on the other side of it. Again, rebooting the controller fixed the problem and the web traffic traverses fine if statically assigning addressing.
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Aug 22, 2011
The two controllers are having two internal DHCP servers with the same range in LAN (enx1,enx2). but i have specified which is primary DHCP server(enx3) in WLAN interface.
Now if a new user added into network, will he get IP address from primary dhcp(WLC) or AP connected WLC.
if two users connected to 2 diff AP's which are connected to 2 WLC will get the same IP address? since having same address pool configured.
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Sep 16, 2012
I am having trouble getting DHCP working for a site connected using Flex Connect. Here is my setup. I have a single 5508 Controller at one site using the 10.3.0.0 network. All AP's at that site are in local mode and use the local DHCP server, 10.3.0.2. Everything works fine there. Each site uses a different SSID as well.
At my second site, 10.4.0.0, all AP's there connect back to the controller at the site above and are in Flex Connect mode. The AP's work fine and the clients work fine there but they get an IP address on teh 10.3.0.0 instead of the 10.4.0.0 network. If i setup the SSID at this site to override the DHCP server settings and tell it to use 10.4.0.2, which is our local DHCP server, the clients don't get an address at all.Is this simply a matter of setting an IP Helper address on the router where the WLC is located or is there more to it than that?
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Apr 22, 2012
I have Internal DHCP Server configured on the Cisco WLC 5508 and all is working fine. DHCP Range is 192.168.1.100 to 192.168.1.245. Now I created another SSID but I want clients connecting to this SSID get specific IP's or from a specific range. WLC has no option to bind a DHCP pool to a specific IP so what I did I checked the option to "Override DHCP" and added the IP of my firewall WLC is connected to and setup a DHCP Pool on that firewall as 192.168.1.89 to 192.168.1.94 (192.168.1.88/29).
Client can connect to the second SSID but can't grab and IP address, what am I missing ?
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Dec 15, 2011
At customer site we have a wireless lan installed with wireless lan controller 5508. This works fine but the customer wants to add wireless bridge WET200 into the network. The problem is that the bridge seems to authenticate and associates with the LWAPP but does not get an ip-address.
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Apr 10, 2013
Recently I came across a wireless design whcih I ws not able to understand.The design is:
1. Two wireless LAN Controllers 5508, each with 25 AP license. AP load (5APs per Contorller) shared between the WLCs and congured with Backup Controller option.
2. The design has a Data Center Switch 3560x series, on which the two WLCs, Cisco Prime Infrastructure and Cisco MSE were connected. I've attached the design here.
3. The Data Center Switch is configured with DHCP pool for the wireless clients. The IP Address of the Data Center Switch is : 10.xx.xx.2 and Default Gateway is: 10.xx.xx.1
4. On the WLC, the Management Interface is configured with the IP Address: 10.xx.xx.21 for Controller 1 adnd 10.xx.xx.22 for Controller 2. But, their DHCP Server is configured with IP Address: 10.xx.xx.1 but not with 10.xx.xx.2 .
This means, all the DHCP requests are pointing towards the Gateway of the Data Center Switch.Is this the correct configuration?I have seen the Wireless Clients getting the IPs allocated from the DHCP Pool, even though the Management Interface's DHCP server configured with Gateway IP address 10.xx.xx.1 .
The DHCP configuration for the Data Center Switch is:
ip dhcp pool xxxxxx
network 10.164.220.0 255.255.254.0
default-router 10.164.220.1
The Management Interface configuration on the WLC is:
Interface Configuration
Interface Name................................... management
MAC Address...................................... 2c:54:2d:72:b5:40
IP Address....................................... 10.164.220.21
IP Netmask....................................... 255.255.254.0
IP Gateway....................................... 10.164.220.1
External NAT IP State............................ Disabled
[code]....
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Nov 8, 2012
I am trying to come up with a wireless solution for a campus deployment. The campus has ten buildings currently using Autonomous APs and are currently converting to Dual 5508 Controller model.
I would like to have a separate AP Mgmt subnet in each building, so I will configure an ip helper on the SVI on this vlan to:
Option1 - Point to the Internet Router configured with DHCP Option 43 with the controller IP addresses
Option 2 - Point to the Wireless LAN Controller itself.
Problem with Option 1 is that the Internet Router will now have to connect directly to the COE network to be able to route back to the AP mgmt subnets. So I would emply a VRF here to keep the separation.
Problem with option 2 is that there appears to only be one DHCP scope allowed on the controller. So this would mean a flat mgmt network across all buildings which I am trying to avoid. I know that after the AP joins the controller, I could change the IP and change the vlan on the port but this is not very neat.
So question is:
Is there a way of getting multiple DHCP pools on the controller?
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May 1, 2013
Have a WLC 5508 running 7.0.230 with internal DHCP server. Timeout is 3600 seconds. The IP addresses never seem to be released. The controller will show 70 clients but 254 addresses will be assigned.
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Jun 28, 2012
We created the management interface, an internal DHCP scope in same subnet, and Two SSID tied to the same management interface:
- when we connect to the first SSID we have and IP address
- but when we connect to the secone SSID: impossible to get an ip address - auth and association are OK
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May 7, 2012
I am hoping to get your feedback around the dhcp issues I am facing with Two Centrally Switched Wireless LANs. The setup is as follows:
- I have a WLC 5508 which has been configured with 4 SSIDs, out of which 2 are using Central Authentication and Switching. - I have an LWAP connected to the WLC in HREAP mode. - WLC is configured as the DHCP server for clients connecting to the SSID 'Guest'. For the rest, I am using external dhcp server. - Only one scope for Guest Interface is setup on the WLC.
Problems:
1. As far as I know, for WLC to act as internal dhcp server, it is mandatory to have the proxy enabled, but the Clients connecting to SSID 'Internet' are unable to get an ip address from the external dhcp server, if dhcp proxy is enabled on the WLC. If i disable the proxy, it all works fine.
2. DHCP does not release the ip addresses assigned to clients even after they are logged out.
3. If a machine which was earlier connected to 'Guest' SSID connects to the 'Internet' SSID, it requests the same ip it was assigned by the WLC which it was assigned under 'Guest', but gets tagged with the V LAN configured on the management interface.
************Output from the Controller********************
(Cisco Controller) >show sysinfo
Manufacturer's Name............. Cisco Systems Inc.Product Name................ Cisco Controller Product Version................. 7.0.116.0Bootloader Version................ 1.0.1Field Recovery Image Version..................... 6.0.182.0Firmware Version..... FPGA 1.3, Env 1.6, USB console 1.27Build Type.......... DATA + WPS + LDPE
[code]...
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Jul 21, 2012
A client wants us to use the internal DHCP server on a 5508 instead of Windows DHCP. They will have 15 APs initially and upto 25 later. The docs on the 7.2 WLC make it sound like this is discouraged: Internal DHCP Server.
The controllers contain an internal DHCP server. This server is typically used in branch offices that do not already have a DHCP server. The wireless network generally contains 10 access points or fewer, with the access points on the same IP subnet as the controller.
In this case, the APs will not be in the same subnet as the Managment Internet.Is it a mistake to use the internal DHCP with upto 25 APs (3 WLANs)?
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Feb 15, 2013
I have a school with 550 iPads. We are using two 5508 WLCs sharing the number of APs. The DHCP server and the default gateway for the network are on the firewall. The clients are able to get a DCHP. After some time, maybe about longer than a month, the clients are no longer able to get DCHP addresses. A reboot of both controllers takes care of this. Presently we are runing 7.2.110 OS. I am going to upgrade to the latest 7.4.100, and reload tonight.
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Aug 10, 2011
I have a 5508 WLC controller at the HQ with the employee ssid ,the dhcp scope on the ssid is 10.120.0.0/16 network.
However,I want this same ssid to be brodcasted to a remote site using HREAP access point but with different dhcp scope 10.102.0.0/16.
I have tried creating another interface for the remote site with a different dhcp scope(10.102.0.0) but the controller wont allow me create another wlan with same ssid that existed before to apply the new interface created for.
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Nov 7, 2012
All controllers are in version 7.2.111.3.C1 is a 5508, it is ou anchor controller.C2 is a 5508, it is a big site controller.C3 is a 2504, it is a small site controller. C2 and C3 are in the same mobility group than C1 (and all is up up in mobilty managment). When "DHCP Addr. Assignment" is enable on C1 : Clients on C2 received their IP address by our external DHCP server via C1 and the guest tunneling betwenn C1 and C2 and all is working fine. Clients on C3 don't received their IP address by our external DHCP server via C1 and the guest tunneling betwenn C1 and C3, so nothing work.
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Sep 25, 2012
I have a new 5508 that I am setting up. My first one from scratch.
Interfaces:
managment -> 10.10.10.10 ->dhcp 10.10.10.1
voice -> 10.10.7.1 ->dhcp 10.10.10.1
guest -> 192.168.1.2 ->dhcp 192.168.1.2
Local DHCP (via the 5508) is for the guest network while the management and voice use the Windows DHCP server.
My problem, Voice and guest work fine. I have two SSID's (one 802.1X and the other PSK) that use the management interface that will not get an IP. I have enabled dhcp proxy from the cli on the controller. I tried with the management VLAN tagged and untagged.
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May 26, 2013
My 5508 WLC which runs version 7.4 is configured as a DHCP server for the AP management and here's my problem: My AP can get to the address, and can ping the address of the WLC management，But my AP prompts the following log： [code]
In the switch dhcp we can use to do the WLC option43 specified address, but in this case how the address specified WLC, the AP can be registered up?
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Jul 22, 2012
I need raise a especial configuration to 34 APs LWAPP associated to WLC 5508 with IOS 7.0.220
This is the Scenario:We have 34 APs LWAPP with 2 SSID (Corporative & Guest), with 2 DHCP different. The Guest SSID receive IP to DHCP from WLC while SSID Corporative receive IP from Microsoft DHCP. The AP On Site are Local and the Foreign AP are configured like H-REAP (H-REAP Local switching and Learn Client IP Address are marked)
Here is the thing, I need configure a new WLAN (Pruebas) for add to 34 APs (Local and Foreign) but this new WLAN must be receive IP from a New Microsoft DHCP
Firstly I configured a new Physical interface and linked to New WLAN (Pruebas) however i don't know how configure the AP and the DHCP because I want that the AP deliver IP addresses depending the Locality.The last because the SuperScope from DHCP is divided in various subnets and because the IP from the AP will be in another VLAN
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Jul 24, 2012
I just get to hands-on on my new WLC 5508?
1) I'm using a single subnet eg 192.168.1.0/24 for my wireless clients and i'm assigning them via the DHCP server from the WLC. As the clients are however made up of laptops and scanners, i would like to assign a range from 50-150 for the laptops and 151-250 for the scanners for easier identification. But it seems that from the WLC DHCP menu i'm not able to do this unless i segment them into a different network with different gateways.
2) Is there anyway to change the WLC user accounts password too? I dont seems to be able to find the option unless i delete the account and re-create it with the new password.
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Jun 26, 2012
I have a WLC 5508 with LWAP 1242 with wireless bridges connected to the APs I cannot get DHCP to pass through the bridge to the PC connected to the bridge.
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Feb 28, 2013
i have two 5508 ver 7.3.0, one is the primary and one is the guest controller. mobility is up and running. i have an exising guest ssid working with wpa2-psk and web authentication and its working fine but i require a second guest ssid that only uses a wpa2-psk for ipod/ipads as i cant use passive client on primary controller. i presently have the one vlan range and dhcp setup on the guest controller to give addressing to either ssid. i know you can have multiple ssid setup on the guest controller but in other sites i have only had one guest connection comming from the primary controller, just a primary controller on each sites was only creating one link to the same guest controler.
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Jan 31, 2012
I have two 5508 controllers configured with an internal dhcp scope. The scopes on each controller are a /22. I need to expand the scope to provide more addresses. Is there an easy way to add a second dhcp scope without making changes to the existing scope? If so how will the clients devices be able to access that ip address range?
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Dec 5, 2012
We have a 5508 controller authenticates with WPA2-enterprise to 3 possible AAA servers. Today I tried migrating our DHCP server from a Windows 2003 machine to Windows 2008 R2. Migration went smoothly and all wired clients could get IP's. Reservations intact, scopes intact, etc.. you name it. I though it was a great success.
Fast forward about an hour when people started coming into work for the day. Calls started coming in about their laptops not able to connect to the network. I double checked with a spare laptop in our IT department and also my iPhone. Same issue. Seems the only thing I changed today was the DHCP server (from 10.1.1.1 to 10.1.1.2).
After racking my head on it for awhile, I re-enabled the "old" dhcp server (10.1.1.1) and disabled it on the new (10.1.1.2). Instantly wireless clients were able to connect.
Am I missing some configuration step in the 5508 controller when moving DHCP servers? I do plan on running 2 DHCP servers (10.1.1.2 and 10.1.1.10) for redundancy once I get the primary one moved over and working correctly.
I want to decommision the older 2003 server. Its time to raise the domain functional level.
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Aug 31, 2011
User is connecting to 5508, running 7.0.116.0. Previously worked on another AP. TV (client) is set to use dhcp. As other posts have mentioned, "DHCP Addr. Assignment" checkbox is not checked for this wlan, but I also switched it to Required for this wlan but it did not make any difference. Seems to be a problem with just this client as many other clients are on this AP with no problems.
Users have to register their MAC to get on our wireless system, but there is no encyption or security enabled once the device has been registered.
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Sep 1, 2012
i have 5508 WLC and 1242 LAP . i 5508 connects to core switch and LAP connects to access switch, and there is L3 link from core swtich to access switch , so i have to use HREAP to let my WLC to control my APs.in my access switch i set ip helper-address to my WLC in the client vlam, then all the wireless clients cannot get ip address from the WLC.but if i set ip helper-address to another DHCP server , the wireless clients can get ip address .so i dont know why WLC cannot be the DHCP server of the wireless client?
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Mar 29, 2012
I have 2 units Cisco WLC 5508 running software version 7.0.220 with 70 over units Cisco AP 1262N and 1242AG. Some of wireless clients having problem to get the correct IP address from the DHCP server. There are 2 units of Microsoft DHCP. Both DHCP server ip have been configured on the Interface at the WLC. The core switch also being configured with ip helper. I've attached the debug output of one of the wireless client during the problem.
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Feb 23, 2012
In our test set up, we have two WLC 5508 Controllers connected via Checkpoint UTM-1 firewall Inside and DMZ Interfaces. Both the WLC controllers are connected to the firewall via Cisco 3750 switch. On the Local (Inside) Controller, guest SSID is enabled and attached to the wireless management Interface. On the remote anchor controller, guest SSID is enabled and attached to the Management Interface as well. The following configs are replicated on both the Controllers.
SSID Name - guest
Interface - Management ( VLAN 10 on Local and VLAN 20 on remote) -
Mobility Group: Same configs at both ends
SSID Anchor : Anchor SSID on local and local SSID on Anchor.
AP: CAPWAP 3502 Management Subnet
[code]....
Is there any thing missing in the wireless configs and or the firewall rules as i could not see DHCP request back from the Anchor Controller. Also, after DHCP is obtained, the web authentication request will be redirected to an Amigopod device for authentication. In this case is the redirect URL congiguration to be performed only on the Anchor Controller or is this to be replicated on both the Local and Anchor Controllers.
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May 7, 2012
I am using a WLC 5508 and its internal DHCP server. I cant find anywhere I can setup option 43. However, the access points are connected in just fine. Do I need to worry about setting up a seperate DHCP server to get option 43 setup properly?
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Mar 14, 2013
I have Cisco 1131 & 1300 Light Weight Acces Points and I have 5508 WLAN controller. If i enable the wlan controller internal DHCP Server can this access points will work with this internal DHCP server or do i need to configure DHCP option 43 for these access points? Can these access points works with LWAPP or do i need to configure CAPWAP?
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May 17, 2011
We have a network of multiple WLCs: 5508, 4402, WISMs in two C6509 all running version 7 software. We have about a dozen SSIDs and we need to provide DHCP to the one public SSID (which like the other SSIDs span across all controllers) and to do so we thought of using a spare router, Linux workstation or DHCP server on the controllers. We are not sure if using the controllers is an option since we have multiple controllers. Is there a way to setup DHCP on a WLC and tell the others to use that WLC for DHCP for the one SSID?
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Mar 28, 2011
delete a lease from a DHCP scope on a WLC 5508? I'm using that unit as the dhcp server, no relay. I am unable to find anything either through the web or cli.
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Jul 10, 2012
i have WLC 5508 showing the below Logs , which prevent the users from connecting to the SSIDs , also its disconnecting the associted users DHCP Socket Task: Jul 11 09:54:08.992: %SIM-3-DHCP_SERVER_NO_REPLY: sim_interface.c:1039 Failed to get DHCP response on interface 'interface-02'. Marking interface dirty.*mmListen: Jul 11 09:54:08.638: %MM-3-INVALID_PKT_RECVD: mm_listen.c:7671 Received an invalid packet from 10.21.1.25. Source member:0.0.0.0. source member unknown.it shows 3 to 4 times durring 1 hour ,
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Mar 29, 2012
I would like to share one problem with WLC 5508 . we added a new virtual interface on the WLC. One new SSID is associated with this interface.
We created a ACL for this interface to restrict the access via WIFI to certian services. It´s not correct that everything works fine because the change were not applied. [code]
The changes of the ACL are applied on the fly, but for reason we don´t know, the clients don´t get a DHCP IP-Address (after changing the ACL) until the Controller is rebooted.
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May 6, 2012
How do Mobility Groups work with internal DHCP scopes on a WLC 5508?We have a WLC 5508 with two internal DHCP scopes which redirect to captive portals for authentication. I am looking at putting in a second WLC in a mobility group setup to provide some WLC redundancy. The LWAPs will be setup so that every second AP is on the has the second WLC as its primary controller. If the primary WLC fails we want the secondary to be able to take over and issue IP's from the internal scope. How do you set this up with a Mobility group so the second WLC does not act as a rouge DHCP server while the primary WLC is still active?
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