An Update on Windows TCP AutoTuningLevel

Like all modern operating systems Windows has receive window auto-tuning to dynamically adjust the receive buffer size to the throughput and latency of the link. Disabling this feature will definitely limit your Internet speeds. Auto-tuning is consistent throughout all variants of TCP and present in all modern operating systems.   In the modern Internet the… Read more

How to prevent accidental DNS Zone deletions in Windows Server

My name is Ajay Sarkaria and I am a Supportability Program Manager at Microsoft. We have been seeing support volumes where administrators while performing daily tasks may accidentally delete a DNS Zone which is being used in production. This post comes with inputs from our friends in Microsoft PFE team Brent Whitlow; Bryan Zink; Michael… Read more

Announcing: New Transport Advancements in the Anniversary Update for Windows 10 and Windows Server 2016

TCP based communication is used ubiquitously in devices from IoT to cloud servers. Performance improvements in TCP benefit almost every networking workload. The Data Transports and Security (DTS) team in Windows and Devices Group is committed to making Windows TCP best in class. This document will describe the first wave of features in the pipeline… Read more

Enterprise Gateway Configuration for End-to-End validation of HNV Gateway connectivity

This post will help you to configure Enterprise or Physical Infrastructure Gateways using Windows RRAS to validate the End-to-E2E data path for Gateway connections with SDN Private Cloud that you have set up using the instruction from these deployment guides. To understand the deployment topology for various types of Gateways, we need to first understand… Read more

CROSS POST: Fix: Loading DNS zones takes a long time on a Windows Server 2008 R2-based DNS server

Here’s another blog by Ajay Sarkaria that we felt needed to also be on the Networking site due to the nature and the popularity of the article. So we are going to cross post it here. Fix: Loading DNS zones takes a long time on a Windows Server 2008 R2-based DNS serverhttp://blogs.technet.com/b/supportingwindows/archive/2016/04/25/fix-loading-dns-zones-takes-a-long-time-on-a-windows-server-2008-r2-based-dns-server.aspx Please keep in… Read more

CROSS POST: LBFO Dynamic Teaming mode may drop send packets in Windows Server 2012 R2

Here’s a blog done by Ajay Sarkaria that we felt needed to also be on the Networking site due to the nature and the popularity of the article. So we are going to cross post it here. LBFO Dynamic Teaming mode may drop send packets in Windows Server 2012 R2 http://blogs.technet.com/b/supportingwindows/archive/2016/03/04/lbfo-dynamic-teaming-mode-may-drop-send-packets-in-windows-server-2012-r2.aspx Please keep in mind… Read more

Backup and Restore DHCP with Failover Configuration

[This post comes to us courtesy of Vithalprasad Gaitonde from Product Group and Gopalakrishnan Krishnan from Global Windows Networking Support] The DHCP service has evolved with its own in-built failover capability starting Windows Server 2012. With this coming into the picture, how can one go about backing up the DHCP server service with the failover… Read more

Virtual Machine Queue (VMQ) CPU assignment tips and tricks

Hello First a small introduction. I am Marco Cancillo and have been working at Microsoft since 2013 as a Sr. Support Engineer in the western Europe CTS Network team.Within my work I have seen challenges on how to use set-netadaptervmq and achieve an optimal configuration. set-netadaptervmqcmdlet sets the virtual machine queue (VMQ) properties of the… Read more

Windows Server 2012 R2 VPN Interoperability with Cisco ASA

The IKEv2 implementation difference between Windows RRAS Gateway and Cisco ASA results in the non-interoperability between the two VPN devices (documented in this VPN Interoperability guide). This interoperability is affecting a number of customers as Cisco ASA has a large user base. However, Cisco ASA being an End-Of-Line product, the OS update for these devices… Read more

Setting up Port Mirroring to Capture Mirrored Traffic on a Hyper-V Virtual Machine

Hi folks Gopal here again from the Microsoft Networking Escalation team. The article below provides steps on how a Hyper-V virtual machine running on Windows Server 2012/2012 R2 can be used to capture mirrored traffic that is hitting the Hyper-V host. Port mirroring also called as SPAN is a method used to monitor network traffic…. Read more