Bhargav's IT Playground

Why is my HNV gateway not working?

Posted by in System Center VMM

I wrote an article on LinkedIn titled “Your gateway is responding! What is network virtualization doing to your network?”. This article is technical follow-up to the precursor. Not too long ago, I set out to create virtualized networks using Microsoft Hyper-V Network Virtualization (HNV) technology. I merrily went on with creation of required fabric and VM network components. I dedicated a host to HNV gateway function. I created Client VMs and a gateway VM. Here’s what the setup looks like: The setup is pretty simple. Two tenant VMs connected to…read more

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Step-by-Step Configure DHCP Failover with 2012 R2 – Part 2

Posted by in Windows Server

In Part 1, I provided with walk through of how to install DHCP and configure scope on your newly installed DHCP server. In this post, we are going to setup failover between two servers. I am assuming that two DHCP servers are installed and a scope is configure already. So let’s go ahead and configure failover for given scope: In the resulting dialog, you can either select all scopes that exist or select scopes you want to provide failover for: On next page, you need to provide partner server. This…read more

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Taking steps backwards – update BIOS on SuperMicro servers with DOS bootable

Posted by in Technology

Preface In todays’ age, you would think that when you have to update BIOS on your servers, you will be downloading an exe file and simply run it from your machine, ofcourse assuming you are running Windows on the machine. I was in for an unpleasant surprise of finding out that SuperMicro’s MicroCloud systems can only be updated using one of the two methods: Download BIOS zip file, which contains DOS executable and BIOS update bin file (which isn’t named .bin either!) Use IPMI and apply BIOS update OOB (out-of-band),…read more

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Step-by-Step Configure DHCP Failover with 2012 R2 – Part 1

Posted by in Windows Server

Many times in my past years of IT, I wanted to have DHCP load balancing and high availability. It was possible by creating non-overlapping scopes etc. but that was all manual labor of making sure you don’t have overlap and all the headache that comes with careful planning and monitoring. the other option was to create clustered DHCP service. Well, that was convoluted too! Not sure why, but I always disliked the idea of having to maintain two machines with shared storage and other requirements. That’s why I liked how Exchange 2010…read more

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ESX Server Host status shows “OK (Limited)” in System Center VMM 2012 R2

Posted by in System Center VMM

Preface Microsoft’s System Center VMM helps you manage virtual and cloud environments. It includes full support for Windows Server capabilities and also supports VMware vSphere and Citrix XenServer. While Hyper-V has come a long way, and when combined with VMM, it provides great platform for virtualization and private or hybrid cloud deployments. And ofcourse, Microsoft’s Hyper-V isn’t the only hypervisor out there, so even if your organization is now fully committed to Microsoft offerings, it may still have VMware implementation for you to manage. Or you are one of those…read more

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Would you like an open proxy with your firewall?

Posted by in Security

UPDATED 5/8/2014: Cisco/Meraki has updated their documentation to state that a separate firewall is needed to protect MX firewall configured in passthrough mode. However, their document still fails to state that enabling web caching in passthrough mode will make it an open web proxy. When I started working on our datacenter project, we had to decide what hardware we will use for network requirements, including which firewall to use for our needs. Given my previous experience with Cisco PIX and reputation of Cisco in networking world, I decided to go…read more

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Script to download MEC 2014 Content

Posted by in Exchange Server

If you have remotely anything to do with Microsoft Exchange, you probably know that Microsoft Exchange Conference (MEC) took place in Austin not too long ago. If you were an attendee, you were provided with access to recorded content within 24-48 hours after given session. However, if you were not an attendee, you didn’t have anyway to access recorded content. Until today! Microsoft announced that all recorded MEC 2014 content was available publicly starting today on Channel 9. The content can be accessed on Channel 9 at this URL: http://channel9.msdn.com/Events/MEC/2014….read more

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What does Heartbleed vulnerability mean to you

Posted by in Security, Technology

A lot has been said lately of Heartbleed since its announcement few days ago. However, as it goes with overload of information at times, media attention has managed to create mass confusion and hysteria on this topic. Hopefully this post will help answer some of your questions. Let’s try to break it down The Vulnerability The issue stems from a bug in OpenSSL’s implementation of TLS heartbeat extensions. While trying to optimize use of resources when decrypting/encrypting SSL traffic, programming mistake is claimed to have created this vulnerability. Such is…read more

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How to protect your KEMP LoadMaster and applications from Heartbleed bug

Posted by in KEMP, Load Balancing

If you haven’t read about heartbleed bug, it’s pretty serious one you should know about. In a nutshell it exploits OpenSSL vulnerability to read system memory of computers/machines/applicances protedted by affected versions of OpenSSL. This means a hacker can steal your encryption keys as well as see unencrypted form of traffic that was encrypted. Talk about passwords, credit cards, any information you deemed secure and trusted only to an SSL connection! You can read whole lot of gory details here: http://heartbleed.com/ If you are users of KEMP LoadMaster, you should…read more

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Gigabyte Brix – Ultra Compact PC for IT Pro’s Hyper-V lab!

Posted by in Technology

Disclaimer: I wasn’t approached by Gigabyte, neither have anyone provided me any units for review. I am just writing my experience with the unit I purchased recently. As I am getting ready for MEC 2014, I was faced with a question of how should I provide demo environment that I  need for my 3 sessions (RBAC, Exchange integration with Lync and SharePoint, and Load Balancing Exchange and Lync 2013), as well as demos out staff will be doing at our booth on exhibit floor. In the past, I have used…read more

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