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ICMP and Microsoft Network Load Balancing (NLB)

I was told Microsoft NLB only balanced TCP and UDP traffic. This was a problem because ICMP requests would return replies from multiple sources.  


Everything on the Internet indicated that NLB could not load balance ICMP traffic.


I found an obscure URL on Technet that had contrary information.

Apparently the "ICMPFilteringEnabled" option could be enabled with the Windows System Image Manger for new installations.  That sounded like a lot of work to find a feature that may, or may not, be available.


I forwarded the URL to my friend, SAK, and he found the following setting in the Windows registry:


HKEY_LOCAL_MACHINE\System\CurrentControlSet\services\WLBS\Parameters\Interface\{GUID}\FilterICMP

After the setting was changed from 0 to 1 the NLB was balancing ping requests!