I have set up NLB on two Windows 2008 servers to load balance the CAS role. I used a single NIC in multicast mode and have added a static ARP entry on the Cisco L3 switch and all appears to work well. However I get an error message every time I launch the NLB management tool saying things may not work as expected with a single NIC. Can anyone elaborate on what this error means as I can't find any detail on it? What will not work properly when using a single NIC in this scenario?
"Simon Geary" wrote in message news:78E53AC2-627E-4F4B-9DF1-330F25CD7A39@microsoft.com... >I have set up NLB on two Windows 2008 servers to load balance the CAS role. >I used a single NIC in multicast mode and have added a static ARP entry on >the Cisco L3 switch and all appears to work well. However I get an error >message every time I launch the NLB management tool saying things may not >work as expected with a single NIC. Can anyone elaborate on what this error >means as I can't find any detail on it? What will not work properly when >using a single NIC in this scenario? The biggest issue that you have with Multicast is that not all equipment supports multicast of non-mulicast IP addresses. The best practice, when it comes to NLB, is to have two NICs and to use unicast. Unicast will work in all environments. For more info on unicast vs. multicast, you might want to refer to this post: http://msmvps.com/blogs/clusterhelp/archive/2005/08/05/nlb-unicast-vs-multicast-original-posted-feb-21-2005.aspx -- Russ Kaufmann MVP - Windows Server - Clustering ClusterHelp.com, a Microsoft Certified Gold Partner Web http://www.clusterhelp.com Blog http://msmvps.com/clusterhelp The next ClusterHelp classes are: Mar 10- 13 in Denver May 12-15 in New York
