What rates did you set for the ARP policing? Thanks
Chris Hart [cid:image001.png@01D7A94B.455C09A0] Chris Hart Network Operations Engineer Lead Tel: 847-467-7747 Email: ch...@northwestern.edu<mailto:ch...@northwestern.edu> 2020 Ridge Ave, Evanston, IL From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> On Behalf Of Viou, Robert Sent: Saturday, September 11, 2021 9:37 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing any issues in the fall with large classrooms and delayed connection times (Aruba 8.5.0.13) After working with the Aruba TAC last night, these are the changes we made that appear to have corrected the issues we were seeing. Disabling Airgroup temporarily stops the issue with Queuing of the Arp packets. But the changes that we added below allowed us to re-enable Airgroup with APGroup set in the Profile. Still need to monitor to be sure it is fixed, but so far looks good. Monitor/police non-gratuitous ARP attacks: ENABLED Monitor/police non-gratuitous ARP attack action: DROP Bob From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> On Behalf Of Turner, Ryan H Sent: Saturday, September 11, 2021 9:12 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing any issues in the fall with large classrooms and delayed connection times (Aruba 8.5.0.13) We had to make major changes to bring stability to Khrushchev environment. I think we have at this point. We had to significantly detune the ARP policing policies. We had to block virtually every SNMP poller. We had to reboot our controllers. We had to put in place an ACL to block communication from the Mobility masters. A ridiculous amount of work to basically get us where we were 2 years ago and we probably have 15% lower connections compared to then. I am hoping that the upcoming firmware fix will allow us to at least reverse the ACL and SNMP pollers. At this point we are pretty blind into information on individual connections. Ryan Turner Head of Networking, ITS The University of North Carolina at Chapel Hill +1 919 274 7926 Mobile +1 919 445 0113 Office On Sep 10, 2021, at 4:25 PM, Johnson, Christopher <cbjo...@ilstu.edu<mailto:cbjo...@ilstu.edu>> wrote: I haven’t heard anything as of yet. Although interestingly while doing a packet-capture to monitor arp/dhcp rates – noticed one client sending DHCPRequests about 3-4-5 times a minutes – and disassociating/re-associating constantly – and from the received signal strength of the client – there didn’t appear to be any reason for this iPhone – 14.7.X – to behave in such a matter. So I’m wondering if that’s not an isolated behavior. Christopher Johnson Wireless Network Engineer Office of Technology Solutions | Illinois State University (309) 438-8444 Stay connected with ISU IT news and tips with @ISU IT Help on Facebook<https://urldefense.com/v3/__https:/nam02.safelinks.protection.outlook.com/?url=https*3A*2F*2Fwww.facebook.com*2FISUITHelp*2F&data=04*7C01*7CRobert.Viou*40NDSU.EDU*7Cdd0c720e506c47cda65308d9752e34d8*7Cec37a091b9a647e598d0903d4a419203*7C1*7C0*7C637669663628347496*7CUnknown*7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0*3D*7C1000&sdata=TP7NNp8n1*2BVyS2hYfqa7cYLY0bjswlO0FqAqTKioBQk*3D&reserved=0__;JSUlJSUlJSUlJSUlJSUlJSUlJQ!!Dq0X2DkFhyF93HkjWTBQKhk!B0zi5_9S-YJgbcLXO3V2Gp9eodGAJkAvcl9Yf_7gjJ4zM_PVEU4Txe1S-wPrRjZULnc$> and Twitter<https://urldefense.com/v3/__https:/nam02.safelinks.protection.outlook.com/?url=https*3A*2F*2Ftwitter.com*2FISUITHelp&data=04*7C01*7CRobert.Viou*40NDSU.EDU*7Cdd0c720e506c47cda65308d9752e34d8*7Cec37a091b9a647e598d0903d4a419203*7C1*7C0*7C637669663628357488*7CUnknown*7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0*3D*7C1000&sdata=RMTjQdg9p3bfKvhQcn*2BylQWZg2I*2FI3MyRPn31Qnh5rs*3D&reserved=0__;JSUlJSUlJSUlJSUlJSUlJSUlJQ!!Dq0X2DkFhyF93HkjWTBQKhk!B0zi5_9S-YJgbcLXO3V2Gp9eodGAJkAvcl9Yf_7gjJ4zM_PVEU4Txe1S-wPrg4Vpb6Q$> From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> On Behalf Of Viou, Robert Sent: Friday, September 10, 2021 10:28 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing any issues in the fall with large classrooms and delayed connection times (Aruba 8.5.0.13) Some people who received this message don't often get email from robert.v...@ndsu.edu<mailto:robert.v...@ndsu.edu>. Learn why this is important<https://urldefense.com/v3/__http:/aka.ms/LearnAboutSenderIdentification__;!!Dq0X2DkFhyF93HkjWTBQKhk!B0zi5_9S-YJgbcLXO3V2Gp9eodGAJkAvcl9Yf_7gjJ4zM_PVEU4Txe1S-wPrBMxB_YE$> [This message came from an external source. If suspicious, report to ab...@ilstu.edu<mailto:ab...@ilstu.edu>] In regards to: > Aruba believes this is the cause of the new iOS operating system. Our > environment is extremely heavy iOS. We are talking to them now and will > assess the change. Has Aruba mentioned to anyone or has anyone heard any more on this being an IOS issue? Bob From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> On Behalf Of Norton, Thomas (Network Operations) Sent: Wednesday, September 1, 2021 11:31 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing any issues in the fall with large classrooms and delayed connection times (Aruba 8.5.0.13) Thanks for the update Ryan T.J. Norton Wireless Network Architect Network Operations (434) 592-6552 [http://www.liberty.edu/media/1616/40themail/wordmark-for-email.jpg] Liberty University | Training Champions for Christ since ________________________________ From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> on behalf of Turner, Ryan H <rhtur...@email.unc.edu<mailto:rhtur...@email.unc.edu>> Sent: Wednesday, September 1, 2021 12:27 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing any issues in the fall with large classrooms and delayed connection times (Aruba 8.5.0.13) All, Aruba believes this is the cause of the new iOS operating system. Our environment is extremely heavy iOS. We are talking to them now and will assess the change. Ryan From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> On Behalf Of Norton, Thomas (Network Operations) Sent: Wednesday, September 1, 2021 12:17 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing any issues in the fall with large classrooms and delayed connection times (Aruba 8.5.0.13) ha right! Chuck beat me to it, but our limits are similar, we do allow quite a bit more before committing the action the arp rate. T.J. Norton Wireless Network Architect Network Operations (434) 592-6552 <image001.jpg> Liberty University | Training Champions for Christ since ________________________________ From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> on behalf of Enfield, Chuck <cae...@psu.edu<mailto:cae...@psu.edu>> Sent: Wednesday, September 1, 2021 12:13 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing any issues in the fall with large classrooms and delayed connection times (Aruba 8.5.0.13) Thanks to firewalls, ARP is the new ping. From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> On Behalf Of Norton, Thomas (Network Operations) Sent: Wednesday, September 1, 2021 12:13 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing any issues in the fall with large classrooms and delayed connection times (Aruba 8.5.0.13) Thats what we have seen as well, and the larger the subnet, the worst it gets. We were seeing upwards of 10k request a minuet at one point. T.J. Norton Wireless Network Architect Network Operations (434) 592-6552 <image001.jpg> Liberty University | Training Champions for Christ since ________________________________ From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> on behalf of Laramie Combs <comb...@appstate.edu<mailto:comb...@appstate.edu>> Sent: Wednesday, September 1, 2021 12:09 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing any issues in the fall with large classrooms and delayed connection times (Aruba 8.5.0.13) Thanks TJ - it looks like the client is just walking their vlan, with excessive arp traffic, and thats having a bad effect. <image002.png> On Wed, Sep 1, 2021 at 12:07 PM Norton, Thomas (Network Operations) <tnort...@liberty.edu<mailto:tnort...@liberty.edu>> wrote: Hey Laramine/Chuck, The ARP issue most likely the Lenovo Vantage software or IOS 14. Another option outside of filtering is to enable prohibit ip spoofing and arp spoofing. T.J. Norton Wireless Network Architect Network Operations (434) 592-6552 <image001.jpg> Liberty University | Training Champions for Christ since ________________________________ From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> on behalf of Laramie Combs <comb...@appstate.edu<mailto:comb...@appstate.edu>> Sent: Wednesday, September 1, 2021 11:57 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing any issues in the fall with large classrooms and delayed connection times (Aruba 8.5.0.13) HEy Chuck - would you mind sharing that arp limiting client filter with me? We are seeing some new traffic patterns where it looks like user devices are just walking their subnets, and arping for everything -Laramie On Wed, Sep 1, 2021 at 11:47 AM Enfield, Chuck <cae...@psu.edu<mailto:cae...@psu.edu>> wrote: We’ve seen the CPU problem, but I don’t think it resulted in Auth problems here. It may have and we just missed it because the more severe problems it caused masked them. BTW, in our case reducing the amount of ARP calmed the CPU. We applied a filter (Thank you Colin Joseph.) to limit the amount of ARP our wireless clients could send and it smoothed out the spikes. From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> On Behalf Of Cody Ensanian Sent: Wednesday, September 1, 2021 11:41 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] Anyone else seeing any issues in the fall with large classrooms and delayed connection times (Aruba 8.5.0.13) I’m hearing issues of high cpu utilization for STM on the controllers causing issues. Maybe check your controllers and see if you are seeing the high cpu use for STM. Heard earlier today from our SE that Aruba has “identified the issue and is working on a fix.” I suggest opening the TAC case so they can track it better, and help them hone in on a fix better. We’re seeing the high cpu use on one of our controllers (but this controller also has higher client load). However, we have not had a flood of calls to our help desk for wireless issues (not saying they aren’t happening). Our SE also said if you’re experiencing the issue, disabling any system or process level debugging as helped, as well as disabling any SNMP polling. <image003.jpg> -Cody UCCS From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> On Behalf Of Turner, Ryan H Sent: Wednesday, September 1, 2021 9:27 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: [WIRELESS-LAN] Anyone else seeing any issues in the fall with large classrooms and delayed connection times (Aruba 8.5.0.13) This is a stab in the dark. With the University mostly shutdown since the Spring of 2020 (=not operating in standard mode and most people work from home), we got campus upgraded from 6.X to 8.X code base. We’ve also installed many 515 series APs. We are getting a large number of complaints in large classrooms that connecting to things like eduroam takes a long time. Looking into the connection, we see many incomplete RADIUS challenges. The general complaints are ‘we come into the classroom, and for some folks it can take up to 5 minutes to get connected’. The odd thing is that our RADIUS infrastructure is very large, polished and load shared, and we can see no performance issues with any of the RADIUS servers. We have begun reducing power in the large classrooms to make association issues better, but so far that hasn’t changed much. We anticipate opening a ticket with Aruba, soon. We do seem to see the most complaints in the big classrooms. But I do keep going back to the RADIUS Challenges incomplete. I know if no reason for those not to complete unless the connection is broken midway. Has anyone else seen something like this? 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