Hi there, In one of the past cases, one of our customers wanted to know if we supported policy based routing on Windows 2003 or later OSes. First of all, it might be useful to clarify what “policy based routing” means in this context. Let’s take the following as an example: “A server is running as…
Year: 2010
Is MaximumBlockSize registry key supported on Windows 2008 R2 RTM WDS server?
Hi there, Recently I dealt with a connectivity issue that occurs when deploying OS images with Windows 2008 R2 WDS server to PXE clients running in different subnets. As you may already know, we have a workaround for router MTU size incompatibilities seen when deploying OS images to remote subnets in Windows 2008: http://support.microsoft.com/kb/975710 Operating system…
Why doesn’t IPReassemblytimeout registry key take effect on Windows 2000 or later systems?
Hi, I had to deal with a number of support cases where IPReassemblytimeout reg key was set but didn’t take effect on Windows 2003 or a later system and I thought I should be sharing more information about this here. Here are some details: IP fragmentation is needed when an upper layer packet whose payload is…
Things that you may want to know about TCP Keepalives
Hi, In this blog entry, I will be discussing TCP keepalive mechanism and will also provide some information about configuration options on Windows systems. a) Definition Let’s first understand the mechanism. A TCP keep-alive packet is simply an ACK with the sequence number set to one less than the current sequence number for the connection….
Do you still set EnablePMTUDiscovery to 0?
Hi, In this blog post, I would like to talk about a misconfiguration which is still in place on many customer installations. I dealt with many network performance issues where the problem was stemming from using a small MTU size (576 bytes) when communicating with off the subnet hosts. PMTU discovery option helps communicating endpoints…
Syn attack protection on Windows Vista, Windows 2008, Windows 7, Windows 2008 R2, Windows 8/8.1, Windows 2012 and Windows 2012 R2
[Last updated: 13th January 2014] Hi, In this blog entry, I wanted to talk about some changes made in Syn attack protection on Windows Vista onwards systems. Syn attack protection has been in place since Windows 2000 and is enabled by default since Windows 2003/SP1. In the earlier implementation (Windows 2000/Windows 2003), syn attack…
Welcome
Hi there, I work as a network support escalation engineer in Microsoft’s global support organization. I decided to blog about some interesting issues I deal with when troubleshooting customer issues. I will be mainly talking about network trace analysis, network security and some other stuff that might be interesting. Stay tuned! Thanks, Murat