Cisco Wireless :: Clients Unable To Connect And Get DHCP LAP1142N AP
Feb 5, 2013
I have 19 locations, each with 1 or more LAP1142N AP's in FlexConnect mode, AP's are primed using CAPWAP to my 5508 WLC at the datacenter. The AP's join the WLC without issue every time. I have two WLAN's, one guest and one staff, the guest network is open and obtains DHCP from a WatchGuard XTM33 firewall at each of the remote locations. The staff side is WPA2/RADIUS and DHCP is assigned from the WLC. Each AP is assigned a static IP that is not in the DHCP scope. For example: DHCP scope on the branch firewall is 192.168.1.10-250 the AP will be assigned static IP of 192.168.1.1.. The AP's are connected to a HP procurve switch that has a untagged VLAN, the firewall is using the native vlan 1 and so is the AP.
I have been running this network for over a year and it has not had a single issue until the last two weeks. Nothing on the network has changed or has been upgraded.The issue I am seeing is that clients are no longer able to connect to the AP and do not get DHCP assigned to them. I am able to get it working, if I remove the static IP from the AP, the AP will reboot, join the controller, then begin working, users can connect and DHCP is assigned from the firewall as it should. However, If the AP then reboots, the AP will join back to the controller but no clients can connect nor do they get a DHCP address. So, I then reassign a static IP to the AP again and it reboots, connects to the controller and clients then can connect and get DHCP.i've found several posts on this topic, in fact the patch of unassigning or reassigning static IP is one that I found. I am also waiting on my SmartNet to start up and will be contacting Cisco support as well.
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Feb 12, 2013
I have a LAP1142N that is connected to a 3560 nonPoE switch (using compatible power injector) that will not associate to the controller I have set-up. The wireless is existing and I have about 11 other APs connected to the controller with no issues. The AP will pull an IP address from DHCP running on the primary controller. The AP pulls a new IP address in roughly a minute. I set the pool to be 3 IP addresses and set a contant ping to each, there is about 1 request time out before the next IP address starts pinging. I went to the controller and pulled the following message error from the log.
*Feb 13 14:24:58.614: %LWAPP-3-HDR_ENCAP_ERR: spam_lrad.c:4216 Unable to encapsulate LWAPP header for discovery response; AP (APs MAC address)
*Feb 13 14:24:58.614: %APF-3-PDU_ENCAP_FAILED: apf_net.c:771 Failed to encapsulate a PDU for transmission to station00:00:00:00:00:00. Destination IP address not set in L3 mode.
I have tried a different cable, connecting to a PoE switch, different controller, larger DHCP range, hosting DHCP on the distribution switch, I am awaiting console access to the AP since this is remote work. The controller is running Software Version 5.1.151.0. Thoughts?
console inventory output from GUI
Model No. AIR-WLC4402-25-K9
Burned-in MAC Address XXXXXXXXXX
Maximum number of APs supported 25
Gig Ethernet/Fiber Card Absent
[Code] ....
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Feb 12, 2013
Im facing with some DHCP lease issue and its like this,Our Cisco 2951 edge router is configured with local dhcp pool for a set of remote users when they connect through Cisco VPN which was working fine until we planned to change it to a Windows box that is configured for DHCP.The basic idea now is to relay the DHCP requests that are coming from the remote clients through Cisco VPN to the DHCP Windows server. So we added the scope on the server and changed the client config on the router as follows (highlighted is the dhcp relay config). [code]
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Jun 12, 2012
I have a 5508 WLC and 40+ LAP1142N APs spread across 19 locations that allows staff to connect to our private network via wireless. I recently deployed about 40 new laptops all identical make and model HP ProBook 4530's and all have the same client setup for the wireless. Out of those 40 laptops I have 4 that will not connect to the private network. However, these same laptops will connect to my public, open wireless network without issue. In addition to the 4 that will not connect all the others will prompt twice for network authentication.Now, I have about 10 other laptops that are not the HP model and all connect without issue and without dual propt. I don't think this is a wireless network issue but could be some type of issue with this model of laptop.
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May 29, 2013
While trying to connect to WiFi at remote sites APs, the connection is getting time out.User are getting error as 'Unable to connect to <WiFi-SSID>' The APs at corporate office are functioning properly and user are able to connect to the APs.
Wifi Controller: 2504 Software ver: 7.3.101.0
Authentication 802.1x
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Nov 13, 2011
I have a WLC of 4402 and AP's of AIR-LAP1142N-E-K9 . Where am getting problem of that users are complaining that they cannot connect it some times and they used to get disconnected in between.
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Mar 8, 2009
I'm monkeying around with an 881-W. Clients can associate and authenticate to ssid 'test', but they cannot get a DHCP address. Clients plugged into f 0 - 3 get DHCP addresses just fine.
I've looked at a lot of different guides, ran debugs etc. When wifi clients make DHCP requests the server never gets them. So there must be some IRB thing going on.
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Mar 29, 2012
I have new 2504 WLC + 1041LAP. I configured the first DHCP scope on WLC and the first WLAN. Then I set WLC DHCP server in WLAN properties and tried to connect to WLAN with wireless clients.
My wireless clients are able to authenticate on WLAN, but not able to get IPs from DHCP. The only lease that DHCP shows is for 1041LAP.
If I set permanent IPs on my wireless clients, they can connect and ping WLC.
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May 27, 2012
My company AP 1231G is not passing the DHCP address to the client from the DHCP server, my config listed below basicly the AP is on its own VLAN 10.1.123.1 and the DHCP server is 10.1.10.2 -- trying to use iphelper to pass DHCP to clients and the AP is on static IP 10.1.123.2--
!
! Last configuration change at 13:15:56 +0800 Fri May 25 2012 by root
! NVRAM config last updated at 13:15:56 +0800 Fri May 25 2012 by root
!
[Code].....
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Jan 27, 2009
I know this question was asked many times, but I'm still not able to finalize my configuration on 871w. LAN part works fine, but wireless clients do not get DHCP IP. here is the config:
Building configuration...
Current configuration : 2092 bytes
!
version 12.4
no service pad
service timestamps debug date time m sec
service timestamps log date time m sec
no service password-encryption
!
[ code ].....
I'd like to have LAN and WLAN clients in same 192.168.1.0 sub net.
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Jan 16, 2013
I have a 4402 (version 7.0.235) working with 10 units of 1121 APs connected to it. The WLC is not configured to work in LAG mode. Physical portt #1 is connected to the Main Switch (trunk). I have 3 WLAN mapped to 3 Different VLAN and Everything (security and internal, external DHCP) is working swell...Now- I have connected Physical port #2 directly to an ADSL Router (giga port), Configured Port 2 as untaggedwith the proper IP details.I have configured this interface to receive DHCP from the ADSL Router and for some reason, Clients are not getting addresses.When I assign a Static address to my laptop I get internet access and all is nice. I tried configuring The WLC internal DHCP server (instead of the ADSL router) and that didn't work. It seems like a DHCP problem but I dont understand the source of the problem of think of the solution.When turning off the proxy settings I noticed that it worked. Is there anything to do with that? The problem was that after a while the other WLANs starting causing DHCP issues as well.
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Oct 9, 2012
I have a Cisco RV220W running the latest firmware (currently 1.0.4.17), and I have noticed that after about a week of use, wireless clients can no longer acquire IP addresses via DHCP.
I have used Network Monitor on both the DHCP server, and the WiFi client, and can see that the server is receiving the requests and sending a reply, but the client never sees the response from the server. So far the only way to resolve this is to reboot the router.
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Sep 9, 2012
Environment:
1. Core switch - Catalyst 6509e
vlans configured:
a. vlan 50 (wired clients)
[Code]....
here's the problem, wireless clients connected to WLAN guest keep getting DHCP leases from WLAN local 10.0.50.10 (scope 10.0.70.101 to 200)
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Jun 24, 2007
Here at HQ we have a 4402 WLC. At our remote sites we have 1231G APs running in autonomous mode. I upgraded one of the APs -- IOS 12.4(3g)JA -- to run LWAPP. Per release notes I've read upgraded 1231's do not support REAP/HREAP mode, consequently, it's running in LOCAL mode.
The AP is managed by the WLC. I created a WLAN for the remote site and assigned it to the MGMT interface; the remote site subnet doesn't exist in HQ. The DHCP server for the remote site is presently at that site; AP and DHCP server reside at the same place.
Clients authenticate successfully to the remote site AP, however, they are not getting DHCP addresses assigned. Does the DHCP server for the remote site have to reside in HQ since the AP is running in local mode? If so, where is that specified, on the MGMT interface config?
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Aug 17, 2011
I'm setting up a Cisco Aironet 1141 (standalone mode, AP) to handle wireless traffic in the office. It gives out 2 mbssids, one of which authenticates domain users through a RADIUS server and places them in an appropriate VLAN (RADIUS options 64, 65, and 81). The other is a guest ssid that uses WPA-PSK and places users in the restricted guest VLAN. Physically, the AP is connected to a 3750 PoE Catalyst, to which RADIUS and DHCP servers are also connected. AP, SSIDs, RADIUS and EAP authentication all work. The configuration given below is a working configuration. People do get authenticated and do get placed in the appropriate vlan. The problem is that, once authenticated, the "Obtaining IP Address" phase on the client hangs and most clients timeout without getting an IP address. Given that the DHCP server is on the same switch and a test simple ASUS Wi-Fi IP gives out the same scenario (except the multiple VLAN) at the speed of light, I don't think that it's a problem with the network connections between clients and the DHCP server. After reading some topics here, I realized that probably other communication will be extremely slow, as well, but haven't tested that for sure. Clients are all non-Cisco - smartphones, notebooks, etc. Most of them are 802.11G, not N.
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Aug 24, 2011
I have a (single) client (it is a cisco IOS router) behind a wireless workgroup bridge (cisco1242).The client's IP address is obtained via DHCP from the wired network.Now, when roaming occurs, the Client will never have knowledge about this event,and hence will not renew its IP address until lease expiers. This is not a problem of course when Layer 2 roam occurs, but with Layer 3
roam it will interrupt the traffic.
The cisco's IP Mobile implementation does have this issue addressed in DCCoA scenario: the WGB is configured to send an SNMP trap on its dotradio state change;the cisco mobile router is configured with snmp-server manager to process this trap and start DHCP renew on the Down/Up event. Unfortunately, this works in Mobile IP scenario only because I cannot make it work without the mobile router registered with a home agent.
how to force DHCP renew on a client (cisco IOS router) in such a situation - event scripting, SLA, or ...?
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Dec 27, 2012
Is there a way to get the E4200 to NOT provide itself as a dns server to the DHCP clients? I have the unit set up to provide two dns servers to the clients, but the 4200 always provides itself as a third and it uses my cable providers dns servers. I am using a dns based filtering service to prevent certain material from being accessed within my network as the first two resolvers. So long as both or one of the provided servers is working it doesn't fall back to the unfiltered third, but I would prefer to remove it entirely.
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Nov 24, 2012
The router always inserts its’ own address as the primary DNS server for the all DHCP clients even though you have set the DHCP server on the router to assign manual external addresses?
Oh I have a
WRT310n v2
firmware v2.0.01 build 004
Let me elaborate a little so I am clear what I am saying. On the router setup page go to the section that is labeled “DHCP server settings” enter 3 static DNS servers. Say 2 Google and one open dns.
8.8.8.8
8.8.4.4
208.67.222.222
Apply your settings.
Release your ip on your workstation, then renew it. And look at your DNS, the routers address is still the first entry.
DNS Servers . . . . . . . . . . . : 192.168.1.1
I suspect this was probably a design decision so that they could allow a user to open their web browser and type something neat like [URL]. Which for the average user is fine and dandy. If my ISP didn’t suck and try to redirect everything to cached copies I probably wouldn’t have noticed it. But since I end up using the router for DNS and it picks up DNS from my ISP I end up getting Akamai IP addresses, and they have problems with SSL certs…. So you get errors.
I know I can go set the DNS server settings on the workstations. But I really don’t want to do this on all of my devices as they are mobile and switch networks, and on some networks not using the local dns breaks things. Like on the corporate network.
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Aug 10, 2012
I can connect to the network but doesn't connect to the internet. I have tried a lot of ipconfig cmd's /renew said "unable to connect to dhcp server" and others didnt work all out of ideas.
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Oct 30, 2012
with our WLC 5500 controller, once the clients get the DHCP address the page is not redirecting them to the guest portal.What is the best way to check as to why the redirection is failing.
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Jul 3, 2012
I've got an E4200v1 running 1.0.04 firmware with guest access enabled. I'd like to find out who is logged in using the guest access. Is there a way to get a list of the DHCP clients on the guest network? I'm able to do this for the non-guest access via the WEB interface's Status->Local Network->DHCP Clients Table page. But I can't find a similar table for the guest network.
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Aug 2, 2011
I have a Cisco 5500 Series Wireless LAN Controller Model No. AIR-CT5508-K9
I have HREAP groups in Boulder, CO, Boston, MA, and Amsterdam, NL.
The LWAPPS act perfectly in the states (all AIR-LAP1142N-A-K9). The unit AIR-LAP1142N-E-K9 in Amsterdam will not allow any clients to attach unless the SSID broadcasting. I don't want to broadcast SSID. I have used iPhones and Intel 5100 series wlan cards. I don't get it. I have been working with Cisco for weeks. We have even replaced the LWAPP.
I am getting this from the ASA in Amsterdam:
6 Aug 03 2011 20:20:22 PMTU-D packet 1485 bytes greater than effective mtu 1426, dest_addr=wificontroller, src_addr=LWAP, prot=UDP
I don't understand because the mtu on the outside interface is 1500 I guess "effective" is the key word which I missing here.
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Feb 1, 2012
I'm seeing some weird behavior trying to connect my Windows XP SP3 desktop via a USB wireless to my Windows network via Linksys WRT120N Router. It is unable to connect with DHCP. "Limited or No Connectivity" is shown on the network icon and no internet connectivity is present. When i manually assign a static IP, i am able to get connectivity to browse the internet, and I am able to ping the other computers in my network, but I am unable to view the windows workgroup. I am able to manually map network drives, but those drop continually. There seems to be no rhyme or reason to the connectivity and the dropping while I am using the static IP. DHCP does not work at all. I'm just trying to get this computer connected to the windows workgroup so that I can map network drives and printers once and for all. Right now the rest of the network (ethernet cabled to router) works fine. I'm thinking it may be something in the routers wireless config, as I am having the same issues (DHCP not working at all, static IP working but constantly dropping) with a Mac laptop.
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Jun 25, 2012
We have 3 AP1130AG installed on our network with 2 VLANs. The APs are set up with two SSID, one for each VLAN. If two devices are connected to the same SSID on the same AP, they are UNABLE to ping/communicate with each other. If two wireless devices are on the same SSID and different APs, they are able to ping/communicate with each other. When the two devices are connected to the same AP/SSID, I can ping both devices from a server that is wired connected. I need to figure out why I can't ping/communicate between two devices that are connected to the same AP and are on the same SSID/VLAN. Below is the current configuration of the wireless AP.
Building configuration...
Current configuration : 2897 bytes
!
version 12.3
no service pad
[Code]......
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Feb 26, 2013
I have an MSE 3355 running 7.4.100.0, Cisco Prime Infrastructure 1.3.0.20 and 6 wism2 running 7.4.100.0. MSE was correctly added to Prime and assigned to maps and controllers. Context Aware Service is Enabled and Up and I have a permanent license installed with a limit of 3000 elements. The appliance is not able to perform client or rogue tracking. This is what I see under Services->Mobility Services Engines->Context Aware Service->General:
Version7.4.0.38 Operational StatusUpNumber of Tracked Wireless Clients0Number of Tracked Tags0Number of Tracked Rogue APs0Number of Tracked Rogue Clients0Number of Tracked Interferers0Number of Tracked Wired Clients0Total Elements Tracked0Tracked Elements (Wireless Clients, Rogue APs, Rogue Clients, Interferers and Wired Clients) Limit3000Tracked Tags Limit 3000
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Jun 9, 2012
Very strange problem with an EA4500 running 2.0.37.131047. Set it up in no time with a Mixed network on WPA2 Personal, Internet's fine, but I can't see any of my wired clients. They don't ping at all. Even stranger, if I plug into another wired switch port with my laptop, I STILL can't ping the other clients. One is a NAS and one is a network printer so there are no firewalls involved. I power cycled the printer but in vain. I've already reset to factory defaults once, but that didn't work. I'm thinking I'll need to return it.
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Jun 30, 2011
I'm trying to understand my options for assigning addresses to VPN clients on an ASA 5510. Under the ASDM, I have a field for DHCP servers, radio buttons: none, dhcp link, dhcp subnet, and field: client address pools. Cisco's VPN examples demonstrate setting up a client address pool, which I did, but the VPN client isn't assigned a gateway in the process so it can't connect to anything; I really don't understand the point of this. I'd like to create a DHCP pool on the ASA for VPN clients as this seems to be the standard configuration. However, I don't know where in the ASDM to configure this and how it's applied. The only DHCP options I found involved creating a DHCP server on an interface, which I don't want to do since VPN users aren't on a physical interface, right?
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Sep 29, 2011
When on the management interface the clients can't get dhcp but the AP's can on the same vlan. I've tried enabling and disabling dhcp proxy, and using a remote dhcp server as well as the internal server. This same config works on the 4402 we're replacing with version 5.2.193 on it.
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Jan 20, 2011
I've got a 2106 that I'm installing for a customer and having issues with it assigning DHCP to WiFI clients. What's odd is that this was working at one point at home during testing. Only difference at this point is LAN hardware at the customer location.
Simple config- single flat vlan on Cat2960G switch, ASA5505 serving up DHCP for the network. Wired clients are receiving DHCP fine.
Mgmt IP192.168.0.10/24Mgmt Gateway192.168.0.1Mgmt VLAN0Mgmt Int port1Mgmt DHCP server192.168.0.1AP Mgr Int IP192.168.0.11Virtual GW IP1.1.1.1RF group namerfgrp1SSIDxxxxClient Static IP?noCountry Code802.11a/b/g statusenabledRadio resource mgmt statusenabled I've run dhcpd debug on both the controller and the ASA and I see the DHCPD requests on the controller, but I never see them hitting the ASA.
I don't have the specific version of code it's running, but I know it's 6.0. One of my local Cisco account engineers found some Cisco CSC bugs referencing this issue. One TAC cas even referenced stripping all security off the WiFi, connecting the client and then reimplementing the security again.
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Aug 2, 2011
When I go into the Network Settings, and the end of the page I find a list named "Number of Dynamic DHCP clients: 7". As far as I know, I should only see 4, all 4 laptops; however, I see 2 UNKNOWN entries in this list, and one name "Macondo". Each of these entries have an option (a link) saying "Revoke" and other "Reserve". I am just wonder if these entries are intruders in my home network. What should I do? I am afraid to break my internet connection. By the way, I set up every single one of my family 4 laptops at home with a WPA-PSK using a very long key.
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Jan 6, 2013
I've just discovered this thing in Windows Event log. The DHCP-Client log is full with this: the client received a NAK from the DHCP Server. Strangely, they still get the desired IP address. (Which are reserved adresses for the MAC adresses.)So I've looked at the logs in the DIR-615 (rev.D, FW: 4.13), and found this:
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Apr 10, 2012
I recently upgraded a clients WLC and they keep saying they are unable to get an IP address from the DHCP server. It's a simple, flat network and here is what the logs are showing.
*apfReceiveTask: Apr 11 13:37:25.477: %SIM-3-DHCP_SERVER_NO_REPLY: sim_interface.c:1039 Failed to get DHCP response on interface 'management'. Marking interface dirty.
*apfReceiveTask: Apr 11 13:37:17.278: %SIM-3-DHCP_SERVER_NO_REPLY: sim_interface.c:1039 Failed to get DHCP response on interface 'management'. Marking interface dirty.
*apfReceiveTask: Apr 11 13:37:05.880: %SIM-3-DHCP_SERVER_NO_REPLY: sim_interface.c:1039 Failed to get DHCP response on interface 'management'. Marking interface dirty.
*apfReceiveTask: Apr 11 13:13:47.397: %SIM-3-DHCP_SERVER_NO_REPLY: sim_interface.c:1039 Failed to get DHCP response on interface 'management'. Marking interface dirty.
[code]....
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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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