Cisco Wireless :: 5508 - HRES Local Switching With WLC As DHCP Server

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 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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Cisco Wireless :: WLC 5508 - Second DHCP Server For Second SSID?

Apr 22, 2012

I have Internal DHCP Server configured on the Cisco WLC 5508 and all is working fine.  DHCP Range is to 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 to (
Client can connect to the second SSID but can't grab and IP address, what am I missing ? 

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Cisco Wireless :: 5508 / Clarification On DHCP Server For WLC?

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
The Management Interface configuration on the WLC is:

Interface Configuration
Interface Name................................... management
MAC Address...................................... 2c:54:2d:72:b5:40
IP Address.......................................
IP Netmask.......................................
IP Gateway.......................................
External NAT IP State............................ Disabled


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Cisco Wireless :: WLC 5508 Internal DHCP Server

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. 
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................. Version................ 1.0.1Field Recovery Image Version..................... Version..... FPGA 1.3, Env 1.6, USB console 1.27Build Type.......... DATA + WPS + LDPE

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Cisco Wireless :: 5508 Internal DHCP Server

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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Cisco Wireless :: WLC 5508 As Dhcp Server For AP Management Address

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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Cisco Wireless :: 2504 / Assign IP Addresses To Remote Site Wi-Fi Users From Local DHCP Server?

May 29, 2012

Is it possible to assign IP addresses to remote site WIFI users from local DHCP server and forward all other traffic to 2504 WLC?
[WIFI Users] >--------<AP (DHCP server) >------ VPN ---------< WLC

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Cisco Wireless :: 5508 Controller And Changing Windows Dhcp Server

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 to
After racking my head on it for awhile, I re-enabled the "old" dhcp server ( and disabled it on the new (  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 ( and 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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Cisco Wireless :: WLC 5508 - Lightweight AP Client Getting Wrong IP Address From DHCP Server

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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Cisco Wireless :: WLC 5508 - Separate DHCP Server Required To Get Option 43 Setup Properly?

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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Cisco Wireless :: 5508 - Local Switching & Central Authentication

Mar 27, 2012

Should I trunk the port to the AP or not. I have a WLC 5508 in the head office and have AP in the remote office. I do not want traffic in the remote office to traverse the wan back to the WLC. I want the users at the remote office to use the local sub net at the remote site.
Should I then trunk the AP port on the switch to the AP as I have multiple ssid's with different sub nets?

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Cisco Wireless :: 5508 Remote Site Connection / Local Switching Is Disabled

Jan 14, 2013

We have a 5508 controller in main site.Which has two ports connected to local network.Management VLAN 500 is untagged and mapped to Port 1.All other interfaces are including 501 to 507 are mapped to Port 2.We have a SSID that is mapped to VLAN 501 interface , which successfully can be joined in main site.We connect an AP to remote site ;We have a remote site VLAN 115 which can be reached from main site.We connect an AP to access vlan 115 port on the remote site  , we had described option 43 , so AP can successfully finds controller in local mode.
AP gets ip from VLAN 115 , can setup connection / ping controller successfully.There is a wide area connection between remote and main site.No trunk setup , the whole remote site is vlan 115.However when the client is trying to connect the test SSID , client cant get connected nor get ip address.Local switching is disabled.For this setup , client comes to AP as a requested , AP tunnels traffic to controller from vlan 500 , controller lets the client get into wired platform from VLAN 501.

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Linksys Wireless Router :: Wrt54gs / Setup Local DNS Server To Manage Small Office Local-only Domain Names?

Apr 22, 2012

i'm trying to setup a local DNS server to manage small office local-only domain names for our servers. i have the DNS working properly (resolving local machines and using the ISP dns if it can't). so i put the DNS server ip into the "Static DNS 1" field of the router settings. the other 2 static dns fields are empty.the problem is that the router is still using the ISP dns server as the primary and my local dns server as the secondary. i verify this in two places. first, if i go to the "status" tab, DNS 1 shows the ISP server while DNS 2 shows my local DNS server. secondly, if i connect to the wireless device with a linux-based machine, the /etc/resolv.conf file shows the nameserver ips in the same incorrect order.

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Cisco Wireless :: DHCP On WLC 5508 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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Cisco Switching/Routing :: 1941W No IP From DHCP Server With Ip-helper

Jun 12, 2013

I've a Cisco 1941W router which is DHCP server for data-VLANs and uses ip-helper for voice-VLANs. [code] I don't know why I can't have IP from wireless voice VLAN whereas it is OK and wired voice VLAN and conf is the same!

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Cisco Switching/Routing :: Configure 881 Router To Act As DHCP Server?

Jul 9, 2012

Is it possible to configure an 881 router to act as a DHCP server to 4 VLAN's each with a different scopes all through a single ethernet interface? 

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Cisco Switching/Routing :: DHCP Server Catalyst 3750

May 28, 2013

I have customer who has as Core Switch one Cisco Catalyst 3750 with the IOS c3750-ipbase-mz.122-35.SE5.I know that this image support DHCP Server configuration, but I like to implementate new vlans (approx 15) and I want to know if this switch support 15 DHCP Servers.

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Cisco Switching/Routing :: 861 Need DHCP Server With Static IP Addresses

Feb 2, 2013

I used to use a CentOS self-made server for intranet for my little office, but I bouth few days ago a Cisco 861 router to replace the linux box.
1. I have 2 public IP classes from my ISP. 1 class is limitted to 80mbit upload, the other to 30mbit upload. So I need some sort of DNAT to be able to know exactly which intranet computer uses big internet and which one limitted internet.
2. I need DHCP server and with static IP addresses (one computer must always have the same IP address, etc).. i have my needs for this.
3. Also I need external access to some servers inside (web, ftp, etc) [code]
So far so good, all looks simple and I can achieve this in 2 hours on a centos linux box (correct routes, ip forwarding enabled and few iptables rules for NAT/SNAT/DNAT).
But on this brand new Centos router well, i'm not even successful in pinging the outside world, nor the inside world I'm tired of reading the forums, the documentation..i want (at first) a simple scenario: vlan+dhcp, fa4 with 1 public ip address and ACCESS to the real world. I wasn't able to achieve not even that much. [code]

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Cisco Switching/Routing :: Possible To Set NTP Server Via DHCP On 2901 Router

May 2, 2012

i'm interested if it's possible to set the NTP server via DHCP on an 2901 Router with 15.2(2) image.
i configured the interface gigabit 0/0 as dhcp client. The DHCP Server sends to me DNS, Default GW and NTP. All is working fine, but the NTP will not be configured. i tried to add an DHCP option request, but there is no NTP (42) value. [code]

is there any way to add the value NTP (42) for the DHCP request or isnt it possible?            

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Cisco Switching/Routing :: 892 Interfere With Windows DHCP Server

Mar 27, 2012

I have trouble with a Cisco 892 Router from my Internet service provider.
Last week we switched from a virtual Router to a hardware Router. But after plugging it in our LAN Switch, the Windows DHCP Server stopped leasing IP's. I got many BAD_ADDRESS with MAC like e1:80:10:ac, e2:80:10:ac, e3:80:10:ac, e4:80:10:ac, e5:80:10:ac, ea:80:10:ac, eb:80:10:ac, ec:80:10:ac and so on.
I do not have access to the Router config, so I can not dump the config to you. We have a flat LAN, single SUB-Net( and no VLAN, no Spanning Tree. A Keep it Simple, Stupid(KISS) System.
A tech guy from service provider, is telling us, the error is not there fault and my switch is not correctly configured. But this is ********. For years we had a another Cisco Router from the precursor ISP and for 2 years the virtual Router from our current ISP. No trouble with my DHCP. But after plugging the new Router in, my DHCP stopped working.On the 892 is no running DHCP, but something interferences with my Windows Server 2008 R2 SP1 DHCP Server.

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Cisco Switching/Routing :: How To Let Nexus 5548UP Act As DHCP Server

Nov 14, 2011

it's possible to let the Nexus 5548UP act as a DHCP server? (or if it will be possible in future releases)

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Cisco Wireless :: WLC 5508 Internal DHCP

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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Cisco Wireless :: 5508 - WLC And Remote DHCP

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 network.  All AP's at that site are in local mode and use the local DHCP server,  Everything works fine there. Each site uses a different SSID as well.
At my second site,, 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 instead of the network. If i setup the SSID at this site to override the DHCP server settings and tell it to use, 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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Cisco Switching/Routing :: 891 Router DHCP Server Reservations Being Overridden?

Dec 11, 2012

I am running into a DHCP problem on a Cisco 891 running 15.0(1)M2.  I am running DHCP on the router and want to reserve an address for a printer.  I have done this hundreds of times on hundreds of routers.  Per Cisco recommendation, I let the printer lease an address to see whether it uses it's "hardware-address" or "client-id".  This printer uses the "hardware-address" format.  The printer has leased right off the bat.  I want it at
I have a DHCP pool, like this:
ip dhcp pool CLIENT
   domain-name chsinc.ds
   lease 2
I create a "reservation" like so:
ip dhcp pool HP_LaserJet_Printer
   hardware abcd.ef12.3456
Now I do a "show running-config" to see what I've put in and it looks just like above.  Now we reset the network settings or change any network setting on the printer to force it to renew it's lease.  What should happen and what usually happens is that the printer should request an IP, be offered, accept that IP and come up on that IP address.  What is happening with this particular printer is that the printer requests a specific IP (the same IP that it had initially =, the router says OK and does not enforce the reservation.  Then the router actually deletes the hardware-address config line right out of the running config.  A "show running-config" shows that the reservation config now looks like this:
ip dhcp pool HP_LaserJet_Printer
See the logs below.  Notice the ones in bold.
000226: Dec 12 17:34:01.382: DHCPD: Seeing if there is an internally specified pool class:
000227: Dec 12 17:34:01.382:   DHCPD: htype 1 chaddr 101f.74b0.575c
000228: Dec 12 17:34:01.382:   DHCPD: remote id 020a00000ae1e10100000001
000229: Dec 12 17:34:01.382:   DHCPD: circuit id 00000000


Is there a way to make the router enforce the reservation and not let clients just bring their own IP and actually make changes to the running-config of the router?

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Cisco Switching/Routing :: 3725 - DNS Not Working After DHCP Server Config

Jan 24, 2013

I seem to be having a problem with DNS name resolution after configuring my router (Cisco 3725 running IOS image: c3725-adventerprisek9-mz.124-25.bin) for handling DHCP requests.
Before I made the change, everything was working correctly; I could ping from a computer inside my LAN and would get response from one of Google's public IP's like normal.
I had a separate DHCP/DNS server running Windows Server 2008 handling the DHCP request and DNS queries.
When I made the change, I turned off the DHCP/DNS server and issued the following DHCP commands to my router:

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Cisco Switching/Routing :: Configuring DHCP Server On WS-C2960S-24PS-L

Jun 5, 2013

I receive a question from a future customer about this future if its supported on " WS-C2960S-24PS-L":configuring 2 dhcp server on this swith ( 1 dhcp for voice vlan , and 1 for Data Vlan).I did some search , but i didnt find the answer .i have to advice a customer before ordering the switch.

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Cisco Switching/Routing :: 4500 DHCP Server On Access Port

Apr 24, 2011

On a 4500 switch port , defined as access vlan 10, if the user connects his own dhcp server ( instead of the normal pc that should be connected ), will it cause issues with my existing network. the existing network is all static ip. In above case, will the dhcp server start looking out and assign dhcp ip's , if a user unknowingly removes his static ip and changes to obtain ip via dhcp option on the lan properties.

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Cisco Switching/Routing :: Catalyst 3560-X Switch To Act As DHCP Server

Apr 26, 2012

I'm attempting to configure a Catalyst 3560-X Switch to act as a DHCP Server. There is documentation that supports this feature. Below is my config procedure however after the completed procedue no IPs are handed out to clients. [code]

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Cisco Switching/Routing :: Nexus 7018 Support Dhcp Server?

Oct 26, 2011

Can I configure a DHCP Servero on the Nexus 7018?

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Cisco Switching/Routing :: 2960 With LAN Lite Software Be DHCP Server?

Feb 10, 2013

I need to  buy a cheap Cisco switch with DHCP server.Can you confirm that 2960-24-S, 2960-24TC-S and 2960-48TC-S be a DHCP server?

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Cisco Switching/Routing :: 3750X / DHCP Server Not Handing Out Specific IPs

Apr 17, 2013

I have a DHCP server for a subnet that has only lightweight WAP's in it.  The DHCP server is running on the gateway for this subnet which is a 3750X 2 switch stack running 12.2(53r)se2.I have the following configured:

ip dhcp excluded-address
 ip dhcp pool DHCP-VL20
ease 3
The server hands out up to 18 IP addresses and no more, with 20 devices on the subnet.  Scanning the subnet with a 3rd party network management system I see the following IP's never get handed out or used: - 162 (manually excluded) - 168 - 176
and of course  2 IP's I have manually excluded, 11 IP's in all that wont get handed out.  It should only be 2 that don't get handed out.  I've double and triple checked the exclusion and thats the only one.  so I run a 'sh ip dhcp pool' and see this:
Pool DHCP-VL20 :
Utilization mark (high/low)    : 100 / 0
Subnet size (first/next)       : 0 / 0
Total addresses                : 30

[edit]I should also mention that "sh ip dhcp bind" does not show these randomly excluded IP's in use.  They also do not show up in any arp table I can find.I have looked all over the config and I cant find where these extra 9 addresses are being excluded. how to free up these 9 seemingly random exclusions?  Haven't issued a reload and I haven't deleted and rebuilt the DHCP server yet, production network.

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Cisco Switching/Routing :: 2950 - DHCP Server With Command To Enable It

May 4, 2012

I am wondering if it has its own DHCP router and if theres a command to enable it?Also Random side question. it hands out ip addresses to other devices (the 2950 im using infront of a router) but when I hook up another switch to this switch it doesnt initialize the port or try to connect? why.

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Cisco Switching/Routing :: 4500 - Dhcp Server On Access Port

Dec 24, 2011

On a 4500 switch port , defined as access vlan 10, if the user connects his own dhcp server ( instead of the normal pc that should be connected ), will it cause issues with my existing network. the existing network is all static ip. In above case, will the dhcp server start looking out and assign dhcp ip's , if a user unknowingly removes his static ip and changes to obtain ip via dhcp option on the lan properties.

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