Cisco Wireless :: AP 1242AG Passing DHCP Requests
Jun 10, 2010
I have 2 1242AG APs setup with one SSID and no vlans configured. The APs are connected to a switch along with my DHCP server. Clients are able to connect to the SSID but are unable to get an IP from the server. Clients can plug into the switch and get an IP. If I configure a static IP on the wireless card, the client works fine.
Is there something I'm missing on the AP to allow DHCP requests to pass through? IPhelper?
Here is the AP info: AIR-AP1242AG-A-K9 12.4(21a)JA1
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Dec 15, 2010
We have setup a bridge between two of our offices using two WET200's in adhoc mode. Everything is connected fine and the signal strengh is good. All traffic pass's over the bridge correctly but DHCP requsts/replys seem to be failing to traverse the bridge. Our DHCP server is hosted on site A and the computers on site B fail to obtain thiers IP's from the dhcp over the bridge requiring us to use static IP's.Firmware is currently the latest.
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Dec 14, 2011
Cisco Small Business Switch POE ESW-520-24P with a Wireless Access Point Cisco Aironet AP1141. Both the devices are upgraded to the latest firmware.
Connected to the ESW-520-24P is a Windows 2008 SBS 2011 with DCHP and Domain Controller. Along with the server I have a number of wired computers connected to the switch which do not have any issues and connect to the DHCP server without any problems.
When connecting two wireless devices to the AP1141, they get the IP address and DHCP from the server; but when connecting other devices apart the first two they will fail to connect to the DHCP server and do not get any IP Address. They manage to connect to the Wireless access point but they cannot contact the DHCP server.
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Oct 30, 2012
We have an 1140N AP connected to a switch and our "network partner" controls the router and will hand out DHCP and do the NAT for this WLAN. How can I configure the AP to forward DCHP requests through.
I have WPA2 PSK (TKIP) setup and the client is able to authenticate however we fail to get an address. In this case the Ethernet interface was left alone so it has the default config and it gets a DHCP address fine. How can I configure this AP to enable the rest of the WiFI clients to get an IP?
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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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Feb 15, 2012
I have a Linksys WAP200 Wireless-G Access Point problem. It is SW version 2.0.4.0. I have it configured for a small network and the problem seems to be that it is not forwarding DHCP requests onto my DHCP server. I know that it is not a SSID or Key issue as when I give my devices static IP addresses, they communicate fine within my system. The only issue seems to be when the devices make DHCP client requests. I also know that the problem is not my DHCP server as it has the device's IP / mac addresses in its configuration file and other wired devices are able to communicate with it to get their IP address through DHCP.
I have seen that there was talk in some blogs about WAP200 no forwarding DHCP requests and I was hoping that updating the device to the latest release would have resolved the problems.
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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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Mar 4, 2012
A little background on me: I do performance testing for a large corporation, so networking is like an old hat for me - but this has me spinning because it makes no logical sense to me.Here's the layout of my home network:CableModem(passthrough) -> WRT120N -> ENH200 (Access point) -> ENH200 (Client Bridge) -> Netgear N600Both the WRT120N and the Netgear N600 are providing wireless access to clients at both locations. N600 is set not to route or DHCP, and the WAN port isn't used.Initially the WRT120N wasn't in play because the cable modem was serving DHCP, but it wouldn't successfully send DHCP to most clients on the other side of the client bridge. So I installed the WRT120N (old, I know) and it was able to serve up DHCP to any and all systems... for a while. Now DHCP doesn't appear to be working fully again on the Netgear side of the bridge. One device registers in the WRT120N, the client list shows the mac as getting assigned an ID, but the device never actually pulls the address. Static works fine. Those that already have DHCP addresses work like a charm, so I know the link is stable. pingtest.net reports near perfection.
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Feb 7, 2010
I have the bridge working but I have to assign a static IP address to devices connected to it. I can't get it to pick up an address from my DHCP server. Here's what I have:
Cisco ASA5505 (Firewall & DHCP server)
WAP54G - Access Point
WET610N - This Wireless Bridge
The ASA5505 successfully gives DHCP address to ALL wired and wireless computers. The WET610N has connectivity to the WAP54G. The status page indicates it's connected and I can get on the internet if I set a static address. However, once I configure my computer to automatically get an IP from DHCP, it just times-out and says limited or no connectivity. Again, when I set a static IP, I have connectivity to everything. I know the AP is working because I can get an address from my DHCP server (ASA5505) with my other laptops and even my cell phone. Why can't I get a DHCP address through this bridge (WET610N)?
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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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Dec 7, 2011
I am trying out a DAP-1513 unit but there is no forum section for this? My question seems to be general and might cover the other models also. Do the DHCP request, from the attached LAN devices on the DAP, get pass to the DHCP "server?"
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May 30, 2013
I have a sg200-18 connected via one of the ports to my ISP's router/modem. Using an unmanaged switch everything works as expected, but after a few days on my sg200 my two computers fail to get assigned IP's and cannot connect to anything. I also have a couple printers that seem to have no problems getting their IP's passed through to the router as I can use them fine from my machines when connected to the unmanaged switch.
Is there a possibility I don't have my switch setup properly to know that all outgoing data must go to the router, or UDP traffic is being dropped somehow?
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Nov 18, 2012
We've got 5 remote offices with cisco 881 routers, Win Clients behind them and all routers connected via vpn site-to-site to central software router.
Mostly all clients recieve ip addresses from routers in their subnets 192.168.x.024
We have Win DHCP Server in subnet 192.168.181.024
The problem is that some of clients,physically sutuated in 192.168.10.024 subnet, recieve ip addresses from Win DHCP server from 192.168.181.024 subnet.
Here's part of cisco cfg:
interface FastEthernet0
no ip address
!
interface FastEthernet1
[Code].....
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Apr 18, 2013
I'll start out with the fact I work mostly with Wi-Fi and not a lot in the security realm... If I plug my workstation into the 3560, my wired client adapter can get an IP address. But the WLAN adapter will not when associated to WLAN.Usually this is not a problem since you may only have two access points on the controller and a dozen or so hosts. In my case, however, I want to put a few of the ports on the 3560 into the same VLAN as the WLAN on the 2106 so I can give them the same guest access as the WLAN. The hosts plugged into the 3560 get an IP address without issue from the ASA. When I disable dhcp proxy, the WLAN clients get an IP address, but then the APs cannot get an IP address from the internal DHCP server on the WLAN controller, and cease to function when rebooted since they cannot get to the controller without an IP address.
Any way to configure the ASA to accept the modified DHCP packets from the WLAN controller? It appears to me that the ASA is not able to accept DHCP relayed packets.
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Jan 10, 2012
I have two 3560x Catalyst switches setup between two different locations. They link via a PTP line (Layer 2). I have setup Intervlan routing between the switches and that works fine.Each location has a separate subnet and a Windows DHCP server for each subnet.I want to block any DHCP requests to be sent from hosts on one subnet to the DHCP server on the other side (i.e across the PTP link) What is the best method to do this?
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Nov 27, 2012
We currently have a cisco 4402 with firmware version 6.0.182.0 and 4 WLANs currently running on it, we found the need to add an additional WLAN and after the configuration was completed and I tried to connect to it I found that we are not getting an address. If i connect a laptop to the VLAN I can get an IP and am able to browse. If i hard code an IP into a device and connect to the wireless i am able to connect and browse.
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Jul 18, 2012
I have several Cata 3500XL switches connected to one 1 HP L3 switch which is connected Sonicwall router. Vlan1 has subnet of 10.10.0.0/24 and Microsoft DCHP server lays inside VLAN1.
Now i want to add VLAN11 (192.168.10.0/24) as second data VLAN but DHCP requests should go to microsoft DCHP server.
This is what i did:
Configured VLAN11 IP on each cisco switch
IP default gateway with IP from other subnet (i guess this is bad since maybe it should be IP of VLAN11 on HP L3 switch?)
Trunk ports are configured to pass everything on cisco switches
On VLAN11 i configured IPhelper IP to be MS DHCP server on each Cisco switch
I haven't tested this yet but i have problem in process.I can't ping VLAN11 IPs between switches (i configured VLAN1 and VLAN11 with IP). When client plugs computer to a port that belongs to VLAN11 will i be sure that client will get IP from the 192.168 range or there is possiblity that he gets IP from the management VLAN range?
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Dec 15, 2012
Setting up a stand-alone WDS/PXE server.Current we have helper addresses setup to forward the DHCP requests from the different VLAN's to the DHCP server. The WDS/PXE server we are setting up is on its server. How do we craft the helper addresses so DHCP requests go to the proper server hosting DHCP and PXE requests go the WDS server?
Everything I seen on Microsoft Technet, lists using Helper Address as the recommended way, but assume both services are on the same server. Our helper address is as follows on each VLAN interface in router: ip helper-address X.X.X..This is a Cisco 3750.
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Jul 29, 2012
I am seeing a problem with our Cisco 300 switches. We use these switches as access switches, with a stacked 3750-G at the core, two 2960-S at the distribution layer, and about 10 300 Series switches at the access layer (10 port and 28 ports, all PoE).
We use Voice VLAN (VLAN 14) for our Mitel phones – there is a DHCP server on the Mitel system. Phones come up, get tagged VLAN 14 (LLDP), Traffic flows (including Broadcast for DHCP etc…). The system works, and has worked for months.
One day, suddenly, I find that all the Mitel phones on a particular access switch are not working. I look on the Mitel system and the lease on DHCP has expired, and the phone is stuck on renewing its DHCP IP address. I run port mirroring on the switch for VLAN 14 to see what is happening. The phones are stuck on DHCP discover, and I see the DHCP Discover broadcast packets on the switch but nothing else, no DHCP offer packets – hence the phone stuck at boot cycle.
I then do a port mirror from another access switch (that is currently working) – I can see the broadcast packets from the Mitel phones on the broken switch, but on this switch I can also see the DHCP offer packets from the Mitel system. I run two port mirrors simultaneous from the two switches (one working, one not) and I can see that the DHCP offer packets are not coming through to the broken switch. Panic ensues – I look at the distribution layer and there is no problem what so ever.
For some strange reason, the Cisco 300 28 port has stopped passing DHCP broadcast packets on a particular VLAN, even though they are being sent. I power cycle the switch – and hey presto, DHCP offer packets are coming through, and the phones get an IP address and boot properly.
Forward a couple of weeks later, and to today. I have another phone that is showing the same symptoms, luckily it is the only phone on this particular Cisco 300 28 port. The same issue is occurring as described above. I gather as much diagnostic information I can then reboot the switch – but still no joy. I then remember that this switch is not directly attached to the distribution layer and instead gets trunked to another Cisco 300 28 port. I give that a reboot and 5 minutes later, DHCP broadcast offers are passing and the phone boots.
I am listing this problem as not just a ‘one off’ now, and is recurring. It has happened to two of my 300 28 port switches.
All Switches running 1.1.2.0. No link to up time – first instance of the problem, switch was up for 14 days – second instance (another switch) uptime of 39 days LLDP is working fine on the switches, as is Voice-VLAN (Port is tagged and broadcasts out DHCP Discover which is seen by other devices throughout network) Nothing in the log file on the access switch Nothing on the Dist/Core regarding STP – Spanning tree set up is fine throughout.
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Jan 16, 2013
I have two WAP4410N plugged into my Catylist 3560 switches.One of these switches is my Default Gateway for the LAN.The only way I can get a device to connect to the WAP4410N is by assigning it a static IP. Then it works perfectly.
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Oct 7, 2012
On our conference floor, AP 1242AG already exist but I am going to add AP 3602i to increase wireless coverage. . Any issue or concern with this type of setting?
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Apr 5, 2013
is this possible, i need to convert a 1242AG Autonomous back and forth this weekend to use for a quick project for testing. i need to do: take the AP into LWAPP mode (i know how to do this with the aironet utility) take the ap from LWAPP back into a AP mode so i can use it as my access point again. [code]
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Sep 28, 2010
I need to bridge from our office to our shop that is around 800 feet away. Here are the Details
I need the 2.4 ghz antenna for client access (Iphones are not compatiable with 802.11a) The locations are 800 feet away but are line of sight. I need to use the 5ghz antenna for the bridge i have 2 aironet 1242ag's I have 2 2.4 ghz AIR-ANT3213 antennas (planned for client access) I have 2 2.4 ghz AIR-ANT2506 (maybe useless for this)
My problem is that the range of all the listed 5 ghz antennas. None that i can find will bridge 54mb over the 5ghz radio for greater than 170ft
The closest that i can find is AIR-ANT5195. If i put these on both sides and it is outdoors line of sight, will the best i can hope for is functioning and 6mb
Are there options on 5ghz that i am missing.
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Mar 9, 2012
I am in the process of moving our office and part of the task involves relocating our existing wireless access points. They are all 1242AG's running the c1240-k9w7-mx.124-10b.JDA3 IOS. I would like to change the security on the access points to WPA 2 but that selection is not available. I think upgrading the IOS will solve this problem but I am not sure. So I guess I have two questions:
1) Does this Cisco model support WPA 2 ?
2) If so what IOS do I need to load to make WPA 2 available?
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Nov 7, 2012
I need a temporary additional broadband connection at home and I was thinking about a bt openzone hotspot connection...
I have a cisco 1242AG access point which can do bridge mode. The BT openzone thing requires a username and password. Is it possible to connect the 1242 in bridge mode to bt openzone?
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Jun 12, 2012
What would be the ramnifactions of using AIR-1242AG-A-K9 (g radios only: no b clients) and AIR-LAP1231G-AK9 (g radios: only no b clients) with AIR- ANT1728 (non diversity antennas) on the WLAN. Some of the APs 1242/ 1231 will be with in line of site of each other.
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Nov 15, 2006
I am new to cisco products and I am trying to setup an aironet 1242ag. I have figured out the ip given to it but, cannot access it with a browser.
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Feb 28, 2013
My question is about the maximum possible transmitting power in a Cisco 1242AG-E-K9.I did an update of my AP on a new ios version and since then, the maximum power for me is limited to 17 dbm. I check this within the console and the "show controllers dot11radio0 | include Power:" command. I thought that I had 20dbm before the update, but unfortunately I can't proof this by myself because I have no AP left with the old firmware.
Is it possible that the upgrade did this? I read about the regulatory domains for the transmitting power. I live in Switzerland, so I thought I could use 100mW if I want to. I read it's not possible to use the 100mW at each speed but I think I should stull be able to select the 20dbm/100mW or am I missing something?
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Oct 20, 2012
I have an issue with a loss of connectivity after 10-15 seconds. I have a Cisco WLC 2504 controlling a Cisco 1242AG AP. The following is the topology.
Wireless Client -> 1242AG (AP) -> Port 3 WLC 2504 -> Port 1 WLC 2504 goes to fa0/2 on 3560. Port fa0/1 goes to ASA5505 (Inside)
All devices are on VLAN 10 10.50.1.0/24. AP is getting DHCP just fine and is associating with the WLC just fine. I connect my laptop to it and it connects just fine.
I then ping the gateway (ASA) 10.50.1.1 or the layer 3 interface on the switch 10.50.1.7 and it is fine for about 10 seconds, then it just dies then comes back in a few minutes and then goes away again. I have looked for duplicate IP's and can find none in any arp table.
It I just ping the controller 10.50.1.20 it is completely stable. I have moved the WLC directly off the ASA5505, moved the switch port, changed cables and the problem follows. I have even moved the AP to be directly off the switch instead of the WLC and the problem still occurs.
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Feb 25, 2013
I have an existing 1242AG AP in a remote location, I have full access to it. I have a new 1242AG that was ordered but the client forgot to order antennas for it. Is there a way I can find out the exact model of antennas that are connected to the in place AP at the remote location??
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May 19, 2011
How can I configure the wireless not to be shown for users,but used by them? On a Cisco 1242AG I mean when someone do a wireless discovery not see my wireless name, but typing the name be able to connect it.
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May 22, 2013
I have an AIR-LAP1242AG-A-K9, serial number FTX1623B0RX. I just need to know how old this unit is. (I haven't attached it to our Cisco account, so I can't open a TAC for it.)
Boot Version 12.4.13.0 IOS Version 12.4(23c)JA5Mini IOS Version 3.0.51.0
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Mar 11, 2012
I have 1242AG. how many clients can be connected to this AP??
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