This morning we disabled DHCP Proxy and reset all the radios. I'll keep the list posted. Thanks for all the suggestions!
-Mike From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of Jason Cook Sent: Thursday, March 18, 2010 5:49 PM To: [email protected] Subject: Re: [WIRELESS-LAN] Client DHCP issues after WLC upgrade We've had some varying dhcp issues over various releases since 2007, we've generally found a way to resolve. Upgrading drivers has helped, but that's more been with individual client issues, not when you have a number of clients on various OS's having similar issues. We have had similar issues in the past where clients roam between AP's on different controllers and changed the design of our network to reduce roaming between controllers. So rather than having a building with 10 AP's where they are alternately connected to different controllers, the whole building is connected to one. Due to the closeness of buildings we've generally allocated buildings in close proximity to each other to go to the same controller as well as neighboring buildings. Since then (2 years ago) we've had only 3-5 reports a year on this issue, and mostly due to someone mis-configuring primary's for access points. If it's not mis-config then normally it's a neighboring building on seperate controllers so we investigate AP locations, primary controllers and radio power levels and modify the config as seems best. We also had one controller playing up that would simply not provide dhcp to about 90% of clients. After amount of un-successful troubleshooting with TAC we decided (not their suggestion) to set the controller to default and re-config it from scratch. It's been great ever since, we hadn't just upgraded, and it was somewhere in 5.2. Disabling dhcp proxy has also helped resolve a number of issues. Perhaps not ideal solutions for everyone, but certainly has worked well for us. We run 4404-100's and a mixture of 1131, 1231, 1250 and 1142 and noticed no difference to clients on different AP types it's all referred to controllers and roaming. Jason On 19/03/2010 5:18 AM, Lee Weers wrote: No we are not running dhcp proxy. Thank you, Lee Weers Central College Assistant Director for Network Services 641-628-7675 From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of Lee H Badman Sent: Thursday, March 18, 2010 11:16 AM To: [email protected]<mailto:[email protected]> Subject: Re: [WIRELESS-LAN] Client DHCP issues after WLC upgrade Mike, and Lee- are you guys running DHCP proxy on your controllers? -Lee Lee H. Badman Wireless/Network Engineer Information Technology and Services Adjunct Instructor, iSchool Syracuse University 315 443-3003 ________________________________ From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of Schomer, Michael J. Sent: Thursday, March 18, 2010 11:40 AM To: [email protected]<mailto:[email protected]> Subject: [WIRELESS-LAN] Client DHCP issues after WLC upgrade Hello, We are noticing a problem on our WPA/802.1x SSID with some of our clients after a recent Cisco WLC upgrade from 5.2.178 to 6.0.188. The clients are able to connect and authenticate to the SSID; however, they aren't receiving an IP address. We have ruled out the DHCP server as the problem. This doesn't affect all clients, and the problem seems to come and go. We haven't seen a common OS or chipset among the clients that are having problems. We currently are running four WLCs in production, and all of them received the upgrade at the same time. The only thing that most of these clients have in common is that they are associated to APs on two particular controllers. The only thing unique about those two controllers is that they have mostly 1131 APs. When the clients roam to a different WLC, they can usually connect just fine. I'm at a loss right now. We did test the 6.0.188 code in one building (with 1250 APs) for several months before deploying it, without any notable issues. We are now potentially looking at downgrading back to 5.2 code, but aren't thrilled about it. Another option would be to upgrade to 6.0.196, but we haven't done any testing of that code revision. Has anyone seen a similar issue? Does anyone know of any issues with 6.0.188 code and 1131 APs? Any thoughts or advice would be appreciated. Thanks for your help. -Mike Schomer -St. Cloud State University ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. -- Jason Cook Technology Services The University of Adelaide, AUSTRALIA 5005 Ph : +61 8 8313 4800 e-mail: [email protected]<mailto:[email protected]> CRICOS Provider Number 00123M ----------------------------------------------------------- This email message is intended only for the addressee(s) and contains information which may be confidential and/or copyright. 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