Re: [WIRELESS-LAN] Older Apple devices and issues with 802.11N(2.4Ghz)
After updating Cisco, they said that we were hitting two documented bugs - CSCug27515 and CSCug65693. Cisco indicated that this was a bug on Apples side and that these Apples device could experience problems on any network supporting A-MPDU... Thanks, Dustin Howard Network Support Specialist Information Technology Services Truman State University 100 E. Normal Ave. Kirksville, MO 63501 Office - (660) 785-4165 Cell - (660) 341-7869 On 07/20/2017 10:03 PM, Dustin Howard wrote: I think the following would be interesting to share... To recap - I found when I disable all 802.11N data rates on the Cisco 1602i, 1602e, or 1702i radios and force these client to use B/G, they work as expected. Once I enable any MCS data rates the problem presents itself. I think that proves the problem is related to 802.11N. Knowing that I decided to do a packet capture on the crippled iPad 4th generation. I noticed a trend of packets being retransmitted. In every instance, the packets that were retransmitted are 11 bytes larger than the packets that are not retransmitted. After close comparison I noticed that all retransmitted packets include A-MPDU status in the radiotap header. I just got done doing some testing tonight and found that if I disable A-MPDU support on the controller, everything works fine! I went ahead and disabled both A-MPDU and A-MSDU frame aggregation for the 802.11b network until we have a resolution. We experienced issues with Apple devices including iPad 3rd and 4th gen, iphone 5c and 5s, and some Macbook Pros. Thanks, Dustin Howard Network Support Specialist Information Technology Services Truman State University 100 E. Normal Ave. Kirksville, MO 63501 Office - (660) 785-4165 Cell - (660) 341-7869 On 07/17/2017 04:44 PM, Dustin Howard wrote: Thank you for you reply. I have tried a few different data rate combinations including 12 mandatory and lower ones disabled. It didn't seem to help. Thanks, Dustin Howard Network Support Specialist Information Technology Services Truman State University 100 E. Normal Ave. Kirksville, MO 63501 Office - (660) 785-4165 Cell - (660) 341-7869 On 07/17/2017 04:10 PM, Thomas Carter wrote: How are your data rates configured? I seem to recall something about Apple devices that used to be picky about it. We don't have Cisco, but we have 12 as Mandatory and everything lower disabled for NG. Thomas Carter Network & Operations Manager / IT Austin College 900 North Grand Avenue Sherman, TX 75090 Phone: 903-813-2564 www.austincollege.edu -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dustin Howard Sent: Monday, July 17, 2017 3:28 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: [WIRELESS-LAN] Older Apple devices and issues with 802.11N(2.4Ghz) I'm having an issue with some Apple devices and was wondering if anybody has experienced similar or if you have a similar environment and all is working well... My environment is 5508 controllers (8.0.140.17) with 1600 series and 1702i APs. We have 1242 AP so cannot upgrade past 8.0.. I am having an issue with what seems to be only older Apple devices on N(2.4Ghz). The devices authenticate/DHCP just fine but are very slow and only seem to work for a few minutes until you have to restart the wireless card. Loading a video is impossible...pings timeout and have very high latency. Most the time the client cannot even ping the gateway. I have been able to recreate this with iPad, 3rd and 4th Generations, an older Macbook Pro and an iPhone 5c while using 1602i, 1602e, and 1702i APs. I haven't confirmed any other brands having this problem. The devices mentioned above work great if I disable the N data rates on the AP radio. I had two users that were crippled with this issue, so I disabled the N data rates for one building over the weekend. The users said their devices worked great over the weekend. They also work well on the 5Ghz band but we have areas that rely on the 2.4Ghz coverage. If this issue is not resolved before school starts, then I'm afraid will have to disable N data rates globally for the 2.4Ghz band. Appreciate any feedback! -- Thanks, Dustin Howard Network Support Specialist Information Technology Services Truman State University 100 E. Normal Ave. Kirksville, MO 63501 Office - (660) 785-4165 Cell - (660) 341-7869 ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss. ** Participation and subscription information for this EDUC
Re: [WIRELESS-LAN] Older Apple devices and issues with 802.11N(2.4Ghz)
I think the following would be interesting to share... To recap - I found when I disable all 802.11N data rates on the Cisco 1602i, 1602e, or 1702i radios and force these client to use B/G, they work as expected. Once I enable any MCS data rates the problem presents itself. I think that proves the problem is related to 802.11N. Knowing that I decided to do a packet capture on the crippled iPad 4th generation. I noticed a trend of packets being retransmitted. In every instance, the packets that were retransmitted are 11 bytes larger than the packets that are not retransmitted. After close comparison I noticed that all retransmitted packets include A-MPDU status in the radiotap header. I just got done doing some testing tonight and found that if I disable A-MPDU support on the controller, everything works fine! I went ahead and disabled both A-MPDU and A-MSDU frame aggregation for the 802.11b network until we have a resolution. We experienced issues with Apple devices including iPad 3rd and 4th gen, iphone 5c and 5s, and some Macbook Pros. Thanks, Dustin Howard Network Support Specialist Information Technology Services Truman State University 100 E. Normal Ave. Kirksville, MO 63501 Office - (660) 785-4165 Cell - (660) 341-7869 On 07/17/2017 04:44 PM, Dustin Howard wrote: Thank you for you reply. I have tried a few different data rate combinations including 12 mandatory and lower ones disabled. It didn't seem to help. Thanks, Dustin Howard Network Support Specialist Information Technology Services Truman State University 100 E. Normal Ave. Kirksville, MO 63501 Office - (660) 785-4165 Cell - (660) 341-7869 On 07/17/2017 04:10 PM, Thomas Carter wrote: How are your data rates configured? I seem to recall something about Apple devices that used to be picky about it. We don't have Cisco, but we have 12 as Mandatory and everything lower disabled for NG. Thomas Carter Network & Operations Manager / IT Austin College 900 North Grand Avenue Sherman, TX 75090 Phone: 903-813-2564 www.austincollege.edu -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dustin Howard Sent: Monday, July 17, 2017 3:28 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: [WIRELESS-LAN] Older Apple devices and issues with 802.11N(2.4Ghz) I'm having an issue with some Apple devices and was wondering if anybody has experienced similar or if you have a similar environment and all is working well... My environment is 5508 controllers (8.0.140.17) with 1600 series and 1702i APs. We have 1242 AP so cannot upgrade past 8.0.. I am having an issue with what seems to be only older Apple devices on N(2.4Ghz). The devices authenticate/DHCP just fine but are very slow and only seem to work for a few minutes until you have to restart the wireless card. Loading a video is impossible...pings timeout and have very high latency. Most the time the client cannot even ping the gateway. I have been able to recreate this with iPad, 3rd and 4th Generations, an older Macbook Pro and an iPhone 5c while using 1602i, 1602e, and 1702i APs. I haven't confirmed any other brands having this problem. The devices mentioned above work great if I disable the N data rates on the AP radio. I had two users that were crippled with this issue, so I disabled the N data rates for one building over the weekend. The users said their devices worked great over the weekend. They also work well on the 5Ghz band but we have areas that rely on the 2.4Ghz coverage. If this issue is not resolved before school starts, then I'm afraid will have to disable N data rates globally for the 2.4Ghz band. Appreciate any feedback! -- Thanks, Dustin Howard Network Support Specialist Information Technology Services Truman State University 100 E. Normal Ave. Kirksville, MO 63501 Office - (660) 785-4165 Cell - (660) 341-7869 ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss.
Re: [WIRELESS-LAN] Older Apple devices and issues with 802.11N(2.4Ghz)
Thank you for you reply. I have tried a few different data rate combinations including 12 mandatory and lower ones disabled. It didn't seem to help. Thanks, Dustin Howard Network Support Specialist Information Technology Services Truman State University 100 E. Normal Ave. Kirksville, MO 63501 Office - (660) 785-4165 Cell - (660) 341-7869 On 07/17/2017 04:10 PM, Thomas Carter wrote: How are your data rates configured? I seem to recall something about Apple devices that used to be picky about it. We don't have Cisco, but we have 12 as Mandatory and everything lower disabled for NG. Thomas Carter Network & Operations Manager / IT Austin College 900 North Grand Avenue Sherman, TX 75090 Phone: 903-813-2564 www.austincollege.edu -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dustin Howard Sent: Monday, July 17, 2017 3:28 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: [WIRELESS-LAN] Older Apple devices and issues with 802.11N(2.4Ghz) I'm having an issue with some Apple devices and was wondering if anybody has experienced similar or if you have a similar environment and all is working well... My environment is 5508 controllers (8.0.140.17) with 1600 series and 1702i APs. We have 1242 AP so cannot upgrade past 8.0.. I am having an issue with what seems to be only older Apple devices on N(2.4Ghz). The devices authenticate/DHCP just fine but are very slow and only seem to work for a few minutes until you have to restart the wireless card. Loading a video is impossible...pings timeout and have very high latency. Most the time the client cannot even ping the gateway. I have been able to recreate this with iPad, 3rd and 4th Generations, an older Macbook Pro and an iPhone 5c while using 1602i, 1602e, and 1702i APs. I haven't confirmed any other brands having this problem. The devices mentioned above work great if I disable the N data rates on the AP radio. I had two users that were crippled with this issue, so I disabled the N data rates for one building over the weekend. The users said their devices worked great over the weekend. They also work well on the 5Ghz band but we have areas that rely on the 2.4Ghz coverage. If this issue is not resolved before school starts, then I'm afraid will have to disable N data rates globally for the 2.4Ghz band. Appreciate any feedback! -- Thanks, Dustin Howard Network Support Specialist Information Technology Services Truman State University 100 E. Normal Ave. Kirksville, MO 63501 Office - (660) 785-4165 Cell - (660) 341-7869 ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss.
RE: [WIRELESS-LAN] Older Apple devices and issues with 802.11N(2.4Ghz)
How are your data rates configured? I seem to recall something about Apple devices that used to be picky about it. We don't have Cisco, but we have 12 as Mandatory and everything lower disabled for NG. Thomas Carter Network & Operations Manager / IT Austin College 900 North Grand Avenue Sherman, TX 75090 Phone: 903-813-2564 www.austincollege.edu -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dustin Howard Sent: Monday, July 17, 2017 3:28 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: [WIRELESS-LAN] Older Apple devices and issues with 802.11N(2.4Ghz) I'm having an issue with some Apple devices and was wondering if anybody has experienced similar or if you have a similar environment and all is working well... My environment is 5508 controllers (8.0.140.17) with 1600 series and 1702i APs. We have 1242 AP so cannot upgrade past 8.0.. I am having an issue with what seems to be only older Apple devices on N(2.4Ghz). The devices authenticate/DHCP just fine but are very slow and only seem to work for a few minutes until you have to restart the wireless card. Loading a video is impossible...pings timeout and have very high latency. Most the time the client cannot even ping the gateway. I have been able to recreate this with iPad, 3rd and 4th Generations, an older Macbook Pro and an iPhone 5c while using 1602i, 1602e, and 1702i APs. I haven't confirmed any other brands having this problem. The devices mentioned above work great if I disable the N data rates on the AP radio. I had two users that were crippled with this issue, so I disabled the N data rates for one building over the weekend. The users said their devices worked great over the weekend. They also work well on the 5Ghz band but we have areas that rely on the 2.4Ghz coverage. If this issue is not resolved before school starts, then I'm afraid will have to disable N data rates globally for the 2.4Ghz band. Appreciate any feedback! -- Thanks, Dustin Howard Network Support Specialist Information Technology Services Truman State University 100 E. Normal Ave. Kirksville, MO 63501 Office - (660) 785-4165 Cell - (660) 341-7869 ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss.
Re: [WIRELESS-LAN] Older Apple devices and issues with 802.11N(2.4Ghz)
What MBR do you have set for the 2.4 Ghz? *--Jeremy L. Gibbs* Sr. Network Engineer Utica College IITS On Mon, Jul 17, 2017 at 4:27 PM, Dustin Howard wrote: > I'm having an issue with some Apple devices and was wondering if anybody > has experienced similar or if you have a similar environment and all is > working well... > > My environment is 5508 controllers (8.0.140.17) with 1600 series and 1702i > APs. We have 1242 AP so cannot upgrade past 8.0.. > > I am having an issue with what seems to be only older Apple devices on > N(2.4Ghz). The devices authenticate/DHCP just fine but are very slow and > only seem to work for a few minutes until you have to restart the wireless > card. Loading a video is impossible...pings timeout and have very high > latency. Most the time the client cannot even ping the gateway. I have > been able to recreate this with iPad, 3rd and 4th Generations, an older > Macbook Pro and an iPhone 5c while using 1602i, 1602e, and 1702i APs. I > haven't confirmed any other brands having this problem. > > The devices mentioned above work great if I disable the N data rates on > the AP radio. I had two users that were crippled with this issue, so I > disabled the N data rates for one building over the weekend. The users > said their devices worked great over the weekend. They also work well on > the 5Ghz band but we have areas that rely on the 2.4Ghz coverage. If this > issue is not resolved before school starts, then I'm afraid will have to > disable N data rates globally for the 2.4Ghz band. > > Appreciate any feedback! > > -- > Thanks, > Dustin Howard > Network Support Specialist > Information Technology Services > Truman State University > 100 E. Normal Ave. > Kirksville, MO 63501 > Office - (660) 785-4165 > Cell - (660) 341-7869 > > ** > Participation and subscription information for this EDUCAUSE Constituent > Group discussion list can be found at http://www.educause.edu/discuss. > ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss.
