if (ms) blog++;

Random bits of (hopefully) useful technical information on Windows, with a focus on understanding and troubleshooting.

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  • Blog Post: Hyper-V Virtual Networks

    The most common questions that I get on Hyper-V setups relates to the networking configuration, and it seems to be common thing to get wrong, so I’ll try to go through the 3 types of virtual network we have, and how they differ.   A private network can only be used by the child partitions, so consider...
  • Blog Post: Goodness gracious, great walls of fire

    Ask most people what the default rules should look like for a network firewall and they will likely say “drop” or “stealth” – i.e. if the source address:port & destination address:port combination is not matched then the traffic is silently ignored. This is often perceived as being more secure than...
  • Blog Post: On Bandwidth and Latency

    High bandwidth = good. Low latency = good. There is, however, no direct relationship between the two – bandwidth is measured in (multiples of) “bits per second”, whilst latency is measured in milliseconds (the time between a packet being sent and it arriving at the destination). Analogies with IT-related...
  • Blog Post: VM Networking Improvements in Hyper-V in Windows Server 2008 R2

    On the What's New in Windows Server 2008 R2? page you can see one of the improvements for Hyper-V has been improved virtual networking performance, and specifically “offloading” has been extended through to the child partitions for those physical NICs that offer it. I did an in-place upgrade of my home...
  • Blog Post: Network layer tweaks in Windows Server 2008

    KB article 951037 describes some of the new features in the OS related to the network layer, some similar to the “ Scalable Networking Pack ” released for Windows Server 2003 (included in SP2). Some environments (NICs, switches, routers) do not behave well with these new features and unpredictable symptoms...
  • Blog Post: Capturing network traffic in Windows 7 / Server 2008 R2

    Previously a capture filter driver had to be loaded in order to intercept and record all the packets passing through network interfaces (think WinPcap & NetMon filter drivers). Now, the ability to create a network trace is in-box with Windows 7 & Server 2008, without even a reboot required! It...