Yes, we hit this one. I posted to this list about it several weeks back. We changed the MSS value on the WLC to 1366 to fix.
Thanks, -- Curtis K. Larsen Senior Network Engineer University of Utah IT/CIS ________________________________________ From: The EDUCAUSE Wireless Issues Constituent Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> on behalf of Johnson, Christopher <cbjo...@ilstu.edu> Sent: Wednesday, August 16, 2017 9:55 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: [WIRELESS-LAN] Windows 10 Creator's Update - RSC - Low throughput Curiosity Good Morning, I was curious if anyone has run into any throughput issues due to updating to Windows 10 Creator’s Update (Version 1703) – which appeared to be related to “RSC Received Segment Coalescing)” – which was reported to be fixed in - KB4022716 - https://communities.intel.com/thread/115898 - more curious how widespread this potentially is/was and an FYI as this was the first time we had been aware of this issue. The issue presented itself on a Windows 10 Laptop with an Intel AC-8260 Adapter – with speed tests showing .01Mbps Download with 127Mbps Upload (Normal) – behaved very similarly to a fragmentation issue we previously saw at Remote Offices (GRE/IPSEC Fragmentation) – resolved with adjusting MTU. - Proposed Workarounds had been § Client-Side – Adjusting the client’s MTU to 1400 (this resolved our user’s particular issue) – he appeared to have the KB4022716 update applied. § Environment/Controller Wide (Cisco) – Adjusting the MSS Value at the Controller Level to 1360 from 1363 - https://communities.intel.com/thread/115425 · I saw a previous listserv discussion (attached) – where reminded me of the behavior but has been resolved by setting the MSS Value to 1250 (New Cisco Default possibly) – might be a coincidence. With something broad as “Slow Wifi” – some of the discussions in the TechNet Discussion won’t necessarily be related – but MTU Adjustments, RSC, AC-8260, corporate environments kept popping up. - TechNet Discussion - https://social.technet.microsoft.com/Forums/windows/en-US/27dd19ab-78a2-42fc-accb-34bd949a30a7/windows-10-creators-update-causing-very-slow-wifi?forum=win10itpronetworking - Windows 10 Creator’s Update Wi-Fi Issues - https://answers.microsoft.com/en-us/windows/forum/windows_10-networking/wifi-issues-with-creators-update/4a20ba4f-33dc-4397-9823-e12dcb2607ba Christopher Johnson Wireless Network Engineer AT Infrastructure Operations & Networking (ION) Illinois State University (309) 438-8444 Stay connected with ISU IT news and tips with @ISU IT Help on Facebook<https://www.facebook.com/ISUITHelp/> and Twitter<https://twitter.com/ISUITHelp> ********** 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.
