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

Name Resolution Performance of a Recursive Windows DNS Server 2012 R2

In a previous article we talked about the name resolution performance of a Windows DNS server when deployed as an authoritative DNS server. This article details the name resolution performance of the windows DNS Server 2012 R2, when deployed as a recursive resolver. Test Setup and Methodology The test setup constitutes of a DNS client… Read more

Name Resolution Performance of Authoritative Windows DNS Server 2012 R2

This article updates the previous benchmark for name resolution performance on windows server 2012 R2 published here. It details the name resolution performance of the windows DNS Server 2012 R2, when deployed in a strictly authoritative mode on which recursion has been disabled and root hints have been removed. The new benchmarks have been recorded with Dnsperf tool, which… Read more

DNS Server Startup Time Improvements in Windows Server 2012 R2

Issue Summary With the advent of cloud computing, there are more apps, more domains and more web services than ever. Every business needs its footprint on the world wide web. This led to a burst in the number of file backed zones being hosted on a single DNS server. In such a scenario, our tests… Read more

VPN Interoperability guide for Windows Server 2012 R2

Introduction Microsoft® Windows® Server 2012 R2 industry standard IKEv2 tunnel for VPN connectivity (both point-to-site and site-to-site). This enables customers with existing third party VPN devices to easily deploy the Windows Server 2012 R2 VPN gateway and interoperate with these devices to perform branch-site networking. This document covers the working configurations for some of the… Read more

Issues on Windows Server 2012 and 2012 R2 with VMQ and Emulex network adapters

There have been several reports of networking and stability issues on Windows Server 2012 and Windows Server 2012 R2 when deployed on hosts equipped with Emulex NICs.  These issues arise when VMQ is enabled.  The typical symptoms include the loss of network connectivity on one or more virtual machines or an inability to shut down… Read more

Name Resolution Performance of Windows DNS Server 2012 R2

(This article has been updated with new set of results here ) This article details the name resolution performance of the windows DNS Server 2012 R2, when deployed in a strictly authoritative mode on which recursion has been disabled and root hints have been removed. Machine Configuration The tests were performed on a physical machine… Read more

Debugging performance issues with VMQ

In my last posts about VMQ (virtual machine queues), VMQ Deep Dive, 1 of 3, I tried to give readers a thorough understanding on the technology and why it was needed. Unfortunately, I still feel like there’s a piece missing around troubleshooting suspected VMQ issues. Therefore, in this blog post I’d like to address these… Read more

DNS Zone Level Statistics

  The Microsoft DNS Server provided certain server level statistics which enabled an admin to track the usage pattern or monitor DNS server performance. The statistics provided includes server wide query statistics, zone transfer statistics, packet statistics, different record statistics, DNSSEC statistics etc. ( For more details on DNS Server level statistics see http://technet.microsoft.com/en-us/library/jj649858.aspx )… Read more