Cisco Wireless :: 1242 / How To Force Clients DHCP Renew On Mobility Event
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 ...?
I have a high school wireless environment that was installed approximately 5 years ago with 1242AG APs. The install was done based on 2.4GHz coverage everywhere, not for 5GHz or for good density. The high school uses wireless cisco 7921G phones for all the staff and teachers. The issue we're running into is over the last couple years more and more students are bringing in iPhones and android phones that can connect to the public wireless ssid. And with the increase of these wireless devices in the classroom, we've been experiencing more and more call dropped on the wireless phones. I have collected information on number of clients on specific APs that are in the area of most of the dropped calls. At times some of these APs have a total of 40 clients associated to them, over half of which are on the public ssid. I have thought about putting all the phones on to the 5GHz radios, but the implementation of the wireless was only for 2.4GHz coverage, so we have coverage gaps on the 5GHz network. We're thinking about adding more APs but the budget isn't available yet for that, so we're looking at what we can do to make this better for the time being.
Main questions are:
Is there a best practices number of max clients per AP in a wireless voice network?
Are there any other options for preventing dropped calls on the wireless?
I should mention I have already looked over the VoWLAN Troubleshooting Checklist at the link below and made the necessary changes to assure we are following the items on the checklist as close as possible.URL
I want to setup Wireless Clients MAC+Active Directory based acess on AP 1242 standalone Wireless series.Steps i have configured :
1) SSID manger under Open authentication : Selected with EAP. 2) under advacned Radius.MAC Address AuthenticationMAC Addresses Authenticated by: Authentication Server Only 3) Server Manger : Current server list added the radius ip address 10.1.200.x
I have several Cisco WAP4410N access points. They are configured to automatically obtain an IP address through DHCP. This works fine, but I've discovered when the DHCP lease expires, the access point doesn't renew it. It continues to use the same IP address but does not renew the lease. If I reboot the access point, it will renew the lease again.Is this a known issue with the WAP4410N? Is there any way to work around this, other than setting a static IP address or rebooting regularly?
I have a Linksys WRT310N v1 with firmware v1.0.10 build 002Jul 19, 2010 My router fails to renew it's DHCP lease from my cable provider, causing internet access to drop. I can still access my cable modem at 192.168.100.1, but I must do a "IP Address Release" then "IP Address Renew" to get back internet access. The router works fine otherwise.
I am trying to setup two Cisco 1310 bridges (AIR-BR1310G-A-K9-R) for connectivity between two buildings. No external antennas have been setup yet and I am just setting the basic configuration.One is running c1310-k9w7-mx.123-8.JEA3, the other c1310-k9w7-mx.123-7.JA1,setup as a root-bridge, the other as a non-root bridge.However, even after disabling authentication and encryption, both units are still not talking to each other.Maybe a second set of eyes can see an issue?
Can I use the access point 1242 to do clients location using WLC 5008, NCS 1.1 and MSE3310?On this moment I doesn´t need of CleanAir features. I want just to do location for clients and rogue aps.
I wanted to connect to the Internet but my laptop has this message: " Your IP address lease has expired. DHCP was unable to renew your lease." I cannot connect to the Internet. What should I do?
The WAG160N V1 you can change the dns primary default router for the connection "alice adsl 7 mega"? I would like to change it because in widows8, I keep giving every time the system event log, the error: "The computer was not assigned an address from the network (from the DHCP Server) for the Network Card with network address 0xF07D686CB987 . has encountered the following error: 0x79. Your computer will continue to make further attempts to obtain an address " I checked with the ping and the first two dns 85.37.17.15 does not work, while the second works 85.38.28.74. how to configure the DWA140N rev.B2 the property is currently configured as follows: IEEE802.11h = Disable Multimedia / Gaming Environment = Disable Country / region (2.4 GHz) = n. 0 (1-11) Country / region (5 GHz) = n. 0 (36-64, 149-165) Radio on / off = Active Selective Suspend = Disable Selective Suspend idle timeuot in senond = 5 Sensitivity roaming = Disable (options, max, min, average) Ad hoc support 802.11n = Disable
I've configured the DHCP server on a Cisco Switch C3560E as follows:
ip dhcp excluded-address 172.16.0.1 172.16.10.255 ip dhcp pool perth_main network 172.16.0.0 255.255.0.0 default-router 172.16.10.254 lease 0 8 !
My goal was to limit the dhcp to the range 172.16.11.0 - 172.16.13.255, as there are not so many user on this network I so limited the lease time to 8 hours in order to "recycle" the unused addresses". What happend is that it is always using new IPs, even if the lease time has expired.
IP address Client-ID/ Lease expiration Type Hardware address/ User name 172.16.109.90 XXXXXXXXXXXX Apr 04 2013 10:00 PM Automatic 172.16.113.106 XXXXXXXXXXXX Apr 04 2013 06:55 PM Automatic 172.16.113.122 XXXXXXXXXXXX Apr 04 2013 09:04 PM Automatic
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1. How can I force the DHCP server to recycle the unused IPs?
2. Can I specify a DHCP range (172.16.11.0 - 172.16.13.255) instead of an "excluded-address" range?
I've set up a DHCP reservation on a Netgear wpn824v3 router, using its "Attached Devices" list to specify the MAC address of a computer on the network to use IP 192.168.5.200. After using "ipconfig /release" then "ipconfig /renew" on the client PC, though, the client PC keeps going back to the address it got automatically, i.e., 192.168.5.3.How can I force the client to use 192.168.5.200?
I randomly lost Internet connection, and since have not been able to Renew an IP address! Other people in my household can connect just fine. I've tried numerous things to get my internet back, but continue to be unsuccessful in doing so.
Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1985-2001 Microsoft Corp. C:Documents and SettingsMike>ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : miker Primary Dns Suffix . . . . . . . :
I have an RVS4000 located at my office. A user of mine also has one at their house. We have created an IPSec Tunnel between the 2 of them and have them successfully communicating between the 2 networks with no problem.
The problem I have is if I make a change on their end and the router needs to reboot to apply the changes, the WAN port never renews it's DHCP address. The end user must unplug the unit, plug it back in and then the system comes back up with the correct WAN DHCP address, and the tunnel is connected automatically.
I beleive they have the newest firmware (2.0.0.3) but I cannot confirm that right now as the unit is down. I bought the 2 of them at the same time - my unit at the office has the 2.0.0.3 firmware so I am assuming the users does as well.
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?
Can add feature "release" and "renew" to wan dhcp client? Is it WOL not possible in RV220w? i tried forward broadcast magic packet from wan side, change broadcast IP and through VPN tunnel (PPTP & IPSEC)...got failed i change from draytek 2130n to rv220w, 2130n much better. except SSL VPN.
How to configure cisco 3560 to force the client only can get ip by dhcp-relay server ?
The company i am working in has 5 vlans which have been set an lay-3 switch(3560), uses the dhcp-relay server .(in svi configuration: ip helper-address X.X.X.X) well , that works ok~
Now , I got my problem: I need to force the client only can get ip by dhcp-relay server, that means if anyone set static IP manunally , he can't really access to anywhere (to provent anyone set static IP with malignancy )
I know if a h3c router , how to set this configuration n svi configuration : dhcp relay security address-check enable ) the how to configure on a cisco 3560 ?
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.
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.
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 !
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.
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.
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.
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.
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?
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.
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.
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.
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.
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.
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?
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.
