Balancing Act: Dual-NIC Configuration with Windows Server 2008 NLB Clusters

re: Balancing Act: Dual-NIC Configuration with Windows Server 2008 NLB Clusters

AngeloBartzis — Sat, 20 Apr 2013 08:40:28 GMT

Excellent article! Solved the problem on our Win2008 R2 NLB Cluster.

re: Balancing Act: Dual-NIC Configuration with Windows Server 2008 NLB Clusters

Saurabhd27 — Wed, 13 Jul 2011 20:12:01 GMT

In above scenario, what method you have used ( unicast or Multicast)

re: Balancing Act: Dual-NIC Configuration with Windows Server 2008 NLB Clusters

Wayne Crow — Mon, 15 Feb 2010 13:37:11 GMT

Outstanding blog.... such a frustrating little problem easily fixed with this article!

My NLB cluster of my Client Access Servers now works externally!

Thank you!

re: Balancing Act: Dual-NIC Configuration with Windows Server 2008 NLB Clusters

Michael Rendino — Thu, 12 Mar 2009 15:48:34 GMT

Hey Vinit. Is the client IP on a remote subnet? Does the same thing work on a local subnet? If it works locally, it sounds like you're looking at a different issue. Are you running in Unicast or Multicast? If you're in multicast, you may have hit an issue that just got resolved (http://support.microsoft.com/kb/960916) or you may need to add a static arp entry on your router for the cluster IP (http://support.microsoft.com/kb/193602). You may want to take some network captures from both nodes and the remote client to see if the requests from the client are event reaching the cluster.

Hope that helps!

re: Balancing Act: Dual-NIC Configuration with Windows Server 2008 NLB Clusters

Vinit — Fri, 06 Feb 2009 01:38:29 GMT

Hi,

I are depoying NLB in the same config on Windows 2008. We have enabed forwarding but still the issue exists. I are not able to reach cluster ip (on Inbound) from client subnet.

Also, if I move the default gateay to cluster NIC (Inbound), still the same problem.

Would like to highlight that I have enabled forwardig using netsh command and I was able to view it using netsh show interface. However, when i checked in registry "IpEnableRouter" was set to 0, I changed it to 1, rebooted, but still the problem is same.

Any suggestion. Thanks!

re: Balancing Act: Dual-NIC Configuration with Windows Server 2008 NLB Clusters

Mike Crowley — Wed, 21 Jan 2009 23:02:10 GMT

this article http://support.microsoft.com/kb/323339 says 2003 also uses this setting by default, but you are saying 2008 is a change from 2003. which is it?

re: Balancing Act: Dual-NIC Configuration with Windows Server 2008 NLB Clusters

Tomas Lugn — Thu, 15 Jan 2009 13:46:20 GMT

We have tested to configure the forwarding=enabled and that is ok for ping etc. But web clients to the Owa page with ssl notice that the answer is from the wrong NIC. So we set at gateway on the NLB, but what metric should we use?

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re: Balancing Act: Dual-NIC Configuration with Windows Server 2008 NLB Clusters

Joseph Martin Durnal — Fri, 21 Nov 2008 17:49:20 GMT

Now I have something more than, "trust me, I know what I'm doing" when I run into this again (technet blogs tend to be credible sources for the management types). Also, for the folks who are stuck in the Windows NT 3.51 days, I can show them the registry edit.

re: Balancing Act: Dual-NIC Configuration with Windows Server 2008 NLB Clusters

David — Fri, 21 Nov 2008 15:23:27 GMT

Hi Michael, very interesting scenario but, you don't need to activate also the Weak Host Sends to permit the packet from the outgoing NIC to maintain the source IP of the Incoming NIC?