Cisco has released 8.2.141 last week. On Tue, Dec 13, 2016 at 1:33 PM, Swartz, Pola <[email protected]> wrote:
> You want to get to the 8.2.140 code if possible. We were seeing this as > well. However, there is another CCO release coming soon beyond 8.2.140. > 8.2.140 has settle things down a bit for us. > > Smile, > Pola > Wireless Team Lead > Sr. Wireless Administrator > Department of Technology Services > Denver Public Schools > 720-423-3603 > I Proudly Play For Team DPS > > Good enough... isn't > > -----Original Message----- > From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto: > [email protected]] On Behalf Of Bucklaew, Jerry > Sent: Tuesday, December 13, 2016 12:30 PM > To: [email protected] > Subject: Re: [WIRELESS-LAN] Clients unable to obtain an IP address via DHCP > > You need a trace closer to the client. Most likely the offer is not > making it to the client or request is not making it back to the server. > > > Possible causes - > > 1. packetloss at client side > 2. rouge dhcp server > > > On 12/13/2016 02:23 PM, Atanas P Atanasov wrote: > > We're a seeing some odd behavior in our wireless deployment, seemingly > random clients aren't able to obtain an IP via DHCP > > > > When analyzing the DHCP logs and also debugs on the wireless controller, > we see the clients sending a DHCP DISCOVER > > packet and the DHCP server responds with a DHCP OFFER. However the > client doesn't follow up with a DHCP REQUEST. This > > behavior continues sometimes for hours, until the client finally sends a > DHCP REQUEST and obtains a lease. > > > > The side effect of this is our DHCP servers are getting long delays when > the dhcp service is restarted. We are using > > Infoblox dhcp severs in a failover group. From a support case we have > opened with Infoblox, they have determined that > > these excessive dhcp requests are increasing the number of dhcp leases > in the database which causes the long restart. > > > > We have seen similar behavior with our wired clients but in lot smaller > numbers. > > > > > > > > We're a Cisco shop, using 8450 controllers, code version is 8.2.121 > > > > > > > > Attached is a Splunk search on one of the "misbehaving" clients' MAC > > > > Any comments are appreciated. > > > > > > > > Atanas Atanasov > > > > Network Engineer > > > > Syracuse 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/. > -- Kevin McCormick Network Administrator University Technology - Western Illinois University [email protected] | (309) 298-1335 <3092981335> | Morgan Hall 106b Connect with uTech: Website <http://www.wiu.edu/utech> | Facebook <https://www.facebook.com/uTechWIU> | Twitter <https://twitter.com/WIU_uTech> ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
