References for new Hyper-V Features

Hi friends

This blog is basically for reference. Microsoft has added many features in  Hyper-V since it was first introduced in server 2008 and list keeps on increasing with every new Windows server.

Below are few links to understand technologies offered by Hyper-V. Ofcourse there are so many blogs and these are the ones which I found easy to understand and to-the-point.

For DHCP Guard

Note: DHCP Guard don’t stop VM to accept IP. It stops him to provide IP (works as DHCP server) ofcourse if its a DHCP server. We use it to:

  1. Stop rogue DHCP server from offering IPs to clients
  2. Stop DHCP service on particular NIC when server has more than one NIC and we want to block any of them from offering IP. This helps when these NICs are connected to different network and you don’t want DHCP on few of these networks.



For vRSS


RDMA capability is used as a feature “SMB Direct” in Windows 2012/2012 R2. More explanation of SMB Direct is at:


Note: For vRSS to work VMQ must be enabled on host NIC.

For Router Guard

For Port ACL

Often its asked, when these features were introduced in Hyper-V. So, let me compile this information here:

DHCP Guard – Windows 2012

Router Guard – Windows 2012

Port ACL – Windows 2012

SR-IOV – Windows 2012

Virtual NUMA – Windows 2012

vRSS – Windows 2012 R2

RDMA – Windows 2012

VMQ – Windows 2008 R2. Dynamic VMQ was introduced in Windows 2012.

Virtual Switch Extensibilty – Windows 2012

I will keep on updating this blog and I hope it will be as useful for you as it is for me. Thanks for being with me.

SRV records in DNS

Hi friends

Hope this post finds you in good health and spirit. This is not a post rather a reference. I do deliver lot of trainings on DNS and SRV records is very important topic in it. Netlogon service of DC register different SRV records in DNS. There is elaborate post on technet which can serve as reference for me and students. So thought to put link here which will even save my effort on writing by myself (on lighter note).

Here is the reference:

I learned a new info today. Let me add here before I forget.

“DIT in ntds.dit stands for Directory Information Tree”.