Cisco Wireless :: AP1252 Intermittently Blocks ARP Requests From Wired LAN
Jul 12, 2012
I am having connectivity/stability problems with wifi clients, using 14 accesspoints (Cisco AP1252). All wifi clients are impacted, no matter which AP they are associated with.
Symptoms :
------------------
- client associates to a ssid, everything runs fine
- all of a sudden, the client begins having problems contacting certain LAN servers, while others still work.
- after a little while, situation comes back to normal
After hours (and days..) of testing and troubleshooting, I have nailed the problem to be at the AP1252 level. When the client experiences problems, he does not receive Broadcast traffic (thus, he cannot respond to the ARP requests from the server he is trying to contact).
While the client was experiencing the problem, I have configured a port on same switch, to act as a monitor port for the AP he was associated to at the time : it seems to me that the accesspoint DOES receive the broadcasts ARP at all times. Only sometimes it prevents them from reaching the wireless clients.. I did a tcpdump on 2 different clients who were associated to the same accesspoint : both were not getting the broadcasts from the lan.
Tcpdump arp from a wireless client (172.30.2.32) :
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Dec 10, 2011
I have a Cisco RV042 Wired Router. I've got a static IP and a MS Small Business Server in my Router Network. I have forwarded the essential ports to use the IIS and the Exchange Server of my SBS2011 (https, http, smtp, rpc).
I can use the IIS, if the firewall is activated, but the exchange Server can not receive any emails. I have also created some firewall access rules for the mentioned services but without success.
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Apr 8, 2012
WLC software 7.2.103.0
1. first problem: AP1252 can´t join on WLC. MAC was add on mac filter properly.
170Mon Apr 9 15:37:32 2012Mesh Node '2c:3f:38:be:53:ef' failed to join controller, MAC address not in MAC filter list.171Mon Apr 9 15:37:32 2012AAA Authentication Failure for UserName:2c3f38be53e0 User Type: WLAN USER172Mon Apr 9 15:37:32 2012Coverage hole pre alarm for client[1] 40:a6:d9:ef:87:68 on 802.11b/g interface of AP 2c:3f:38:bf:0c:80 (AP2c3f.38bf.0c80). Hist: 46 7 5 4 2 1 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0173Mon Apr 9 15:37:32 2012Coverage hole pre alarm for client[1] 8c:7b:9d:05:a0:67 on 802.11b/g interface of AP 2c:3f:38:bf:0c:80 (AP2c3f.38bf.0c80). Hist: 50 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0174Mon Apr 9 15:37:30
[code]....
Several APs can´t join on WLC and all are added on MAC filter, but they are showing this messages.
2 . Second problem.: Operational Status = UNKNOWN
Some Access Point are in UNKNOWN status. I tried but I can´t do the reboot. I can access Web config the APs using WLC, but when I applied the reset, it wasn´t working properly.
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Jan 16, 2012
have Cisco AIR-AP1252-AG-A-K9 Access Point and 5GHZ radios are not working but interface status showing is up and running but signal is very weak I think it's working through only internal antennas when i connect external antenna even the signal is very weak and i am using external antennas air-ant5135dw-r=. What is the exact problem of that 5ghz radios. I have tried through external antenna gain 9,11 and 27, and all i tested but not working.
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May 22, 2013
I am having problems authenticating client computers onto the wireless network using a Cisco AP1252 via radius
Setup:
I have a Cisco AP1252 wireless Access Point connected to a Cisco ASA5510 on subnet X.X.5.Z The access point ip address is X.X.5.101
The ASA on another port is also connected to the wired network on a different subnet X.X.0.Z
On the wired network are two radius servers - Ubuntus servers running freeradius which are running fine and reliably authenticate wired users for ssh connections to the ASA and importantly to the AP1252 as well (The radius servers ip addresses are X.X.0.191 and X.X.0.192)
Problem:
When a wireless user tries to connect to the wireless network via the AP1252 after being disconnected form it for a while (or after waking from a long sleep) they are never authenticated. They just try over and over and never obtain an IP
Interestingly in such a case neither Ubuntu server shows any sign of receiving an authentication request from the AP - Both ubuntu servers are running in debug mode so they show any activity - there is none
Oddly:
If i try to authenticate a user wirelessly to the AP and leave it in the usual state of trying over and over (with no visible activity on the ubuntu servers) BUT then go to a wired machine and attempt to authenticate an ssh connection to the AP1252 using a terminal command ssh user1@X.X.5.101 THEN as soon as I hit enter on that request (and before I enter a password for the ssh connection) THE WAITING WIRELESS USER IS IMMEDIATELY AUTHENTICATED (and the ubuntu server shows the authentication activity for the wireless user
I really do not understand this and cannot use this method to facilitate wireless user authentication 
What might be causing this behavior - it seems like the AP sleeping and the wired ssh request wakes it up so that it sees the pending wireless user waiting and then acts on that completing the wireless user authentication request.
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Jun 8, 2011
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Oct 30, 2012
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Mar 18, 2013
I'm working on a project where a wi-fi client is tracked and located using RADIUS authentication requests. The problem I'm running into is that the WLC (5508) sends an RADIUS authentication request to my freeradiusd, which is ok so far, but if the client roams to another accesspoint (3602AG, 1131AG, 1252AG), the WLC does not send a further RADIUS auth. request - and the client is allowed to connect to the next ap.Is there an option like RADIUS-cache which I can disable, so that the WLC sends everytime an authentication request when a client tries to connect to an ap or roams from one ap to another one?
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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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I cant seem to be able to open a TAC case.
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Jan 13, 2011
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May 14, 2012
We have a router (7206) which connected to client device in /30 IP segment, but this device is a switch which connected to many more devices. Doing packet capture on our router interface unravel many ARP requests whcih comes from the client switch. Is there any feature or command which we can stop this?
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May 14, 2012
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